Engineering Lesson Plan Template by Gsm4PE

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LESSON                                                                OBJECTIVE PAGE

Significant Changes                                             Created By:
                                                                             Janie N. Sutton, P.E.,
to the 2012 NC                                                                    Chief Mechanical
                                                                                  Code Consultant
                                                                      NC Department of Insurance
Mechanical Code                                                        Office of State Fire Marshal
                                                                           (919)-661-5880 ext 237
DOMAIN: COGNITIVE
                                                                CS Number: 1762
LEVEL OF LEARNING: KNOWLEDGE, COMPREHENSION

MATERIALS: Overhead projector or laptop computer and
multimedia projector; projection screen; North Carolina
Administrative Code and Policies 2009 Edition, North
Carolina Mechanical Code 2009 Edition, North Carolina
Mechanical Code 2012 Edition, Significant Changes to the
2012 NC Mechanical Code Full Power Point Presentation.

MOTIVATION: To educate Code Enforcement Officials on            Presented By:
the changes to the 2012 NC Mechanical Code, as well as                              (Presenter Name)
provide Continuing Education.                                               (Affiliation - Jurisdiction)
                                                                Contact Information:
TARGET: Certified North Carolina Code Enforcement                                   (Contact Address)
Officials, Mechanical Level I, II or III.                                           (Contact Number)
                                                                Instructor number:
Goal: This class is designed to introduce certified NC
                                                                                  (Instructor Number)
Mechanical inspectors to the significant code changes found
in the 2012 NC State Mechanical Code.                           Sponsor:
This Lesson Plan is representative of six hours of Continuing                                (Sponsor)
Education.                                                      Sponsor Number:
                                                                                  (Sponsor Number)
SUMMARY: This presentation addresses the significant
code changes from the 2006 IMC to the 2009 IMC including
North Carolina Amendments. The 2012 NC Mechanical
Code is based on the 2009 IMC.
Not all changes are reflected; only those considered
significant to a majority of code enforcement officials.




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OBJECTIVES

  1. Identify commonalities used throughout the
     presentation to show changes between the 2009 and
     2012 NC Mechanical Codes.


        a. Slide 1: Significant Changes in the 2012 North
           Carolina Mechanical Code
                  i. Explain that this presentation was
                      created by Janie Sutton for the
                      Department of Insurance, Office of
                      the State Fire Marshal.
                  ii.    The timing is allowing time for
                        questions and discussions.
                  iii. The instructor is encouraged to ask
                       for questions, and if the students are
                       hesitant to ask, then ask them
                       questions to get the discussion
                       started.
                  iv. Major changes in the code should
                      be discussed to determine how the
                      inspectors might interpret the new
                      code.
                  v. It is offered to instructors across the
                     state to use in training on the
                     changes in the 2012 North Carolina
                     Mechanical Code to provide
                     consistency in training and
                     interpretation of the 2012 codes.
                  vi. This presentation does not cover all
                      of the changes in the 2012 code. It
                      covers the ones that are most
                      extensive and a few others.
        b. Slide 2: Purpose of the Class
                   i. This course may be taken for 6
                      hours credit only once in a two year
                      period.
                  ii.    This course is not approved by the
                        licensing board for mechanical
                        contractors.



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        c. Slide 3: Purpose of the Class (cont’d)
                 i.  Emphasize the mandatory date of
                     March 1, 2012.
                ii.    The codes that have been approved
                       and will become mandatory March 1,
                       2012 are this code, the plumbing
                       code, the building code, the fire
                       code, the fuel gas code, the
                       residential code and the energy
                       code.
                iii.   The 2011 electrical has not yet been
                       approved as of July 1, 2011.
                iv.    Check the DOI website for updates
                       on the status of these codes.

        d. Slide 4: Errata
                 i.   Read this slide and go to next slide.

        e. Slide 5: Format of Presentation
                 i.  Explain that this format is designed
                     to make it easy to tell new code from
                     current code, and comments from
                     code language.
                ii.    As an instructor, you will need to
                       make an exception and read the
                       code.
                iii.   Then explain and discuss the code
                       with the class.




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Presenter Notes slides 1 – 5:




End of Presenter Notes slides 1 – 5:
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2. Discuss the significant changes to Administration Chapter of
   the 2012 NC State Mechanical Code.
        a. Slide 6: Chap.1 Administration
                        i. Sections 101 through 109 are changed
                           by the North Carolina Building Code
                           Council to reflect North Carolina Law.
                       ii. There are no changes in these sections.

        b. Slide 7: 110.1 General
                      i. Read this slide, then go to the next slide
                         for comments.

        c. Slide 8: Section 110
                       i. Comment on types of systems that
                          would be used on a temporary basis.
                      ii. Temporary chillers and boilers are
                          examples.
                     iii. You can probably think of others.

        d. Slide 9: 110.2 Conformance
                      i. Read this section and go to next slide
                         for comments.
        e. Slide 10: 110.2 Conformance (cont’d)
                       i. You do not need to read this since it is
                          not code.
                      ii. Comment on the areas of the code that
                          are important for life safety and access.
        f. Slide 11: Section 110
                       i. This is a comment to introduce the next
                          section of code on temporary utilities.
                      ii. Ask the class where this might apply.
        g. Slide 12: 110.13 Temporary Utilities
                      i. Read this section and go to next slide.
        h. Slide 13: 110.14 Termination of Approval
                      i. Read this slide and go to next slide for
                         comment.
        i.   Slide 14: Section 110
                         i. Instructor may read or paraphrase the
                            points on this slide.
                        ii. You may want to go back to the
                            previous slide and read it again.
                       iii. Some inspections departments have
                            had difficulty with temporary permits

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                      being closed and permanent permits not
                      being issued.
               iv.    One way to control this is to require a
                      bond for the temporary permit that is
                      returned when it is closed out.
                      (Suggestion only)
                v.    Note that each of the two previous
                      paragraphs say that the code official “is
                      authorized to” allow the use of
                      temporary utilities and terminate the
                      permit.
               vi.    The code official is not required to allow
                      them.
              vii.     However, when the code official
                      determines that these provisions can be
                      met, he/she should be willing to use
                      these provisions unless there is a good
                      reason not to allow temporary utilities.
              viii.   Chapter 2 definition will not be covered
                      here. Some definitions will be covered
                      later.




Presenter Notes slides 6 – 14:




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End of Presenter Notes slides 6 – 14:


 3. Discuss the significant changes to the General
    Regulations Chapter 3 of the 2012 NC State
    Mechanical Code.
     a. Slide 15: 301.4 Listed and Labeled
                 i. This part of section 301.4 has not
                    changed.
                ii. There is a new exception.
      b. Slide 16: Section 301
                 i. Exception 2 has been added.
                ii. Read the exception and go to next slide
                    for comment.
      c. Slide 17: Section 301 cont’d
                  i. New equipment designs for energy
                     efficiency might be new types of dual
                     fuel appliances.
                 ii. Ask the class about other field erected
                     equipment they may have seen.
                iii. This helps officials share information
                     between jurisdictions.
    d. Slide 18: Section 301 cont’d
                 i. Section 105 is where alternative means,
                    methods, and materials are located.
                ii. For field erected equipment this section
                    can be used instead of 105. Any
                    components or parts that should
                    normally be listed shall be used and the
                    design must be by a registered
                    professional.
               iii. For example, a built up air handler is
                    typically designed by a registered
                    professional. The arrangement is shown
                    on drawings and the components
                    described in the specifications.
    e. Slide 19: 301.14.1 Foundation and Exterior Wall
       Sealing
                i. This covers all types of piping and other
                   openings. Where piping, cables, vents,
                   ducts pass through foundations and
                   exterior walls, the spaces shall be


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                     sealed to protect against the passage of
                     rodents.
                 ii. This section also describes how it is to
                     be sealed.
    f. Slide 20: 304.4 New Paragraph added
                 i. Read this slide and talk about it.
                ii. Ask in what Group H occupancies
                    could you have an appliance with an
                    ignition source. (toxics)

    g. Slide 21: 304.6 Public Garages
                 i. This section is a clarification. Read only
                    the existing and new.
                ii. Do not read the portions that have been
                    deleted.
               iii. The next slide provides a diagram and
                    opportunity to comment and discuss the
                    code section.
    h. Slide 22: Section 304 (cont’d)
                  i.    The height requirement is based on the
                       door height, which the code official can
                       readily determine instead of a vehicle
                       height that might not be known at the
                       time of installation of the appliance.
    i.   Slide 23: Section 304 (cont’d)
                   i. If the vehicle can pass under the
                      appliance, the height shall be one foot
                      above the tallest vehicle garage door
                      opening.
                  ii. If the vehicle cannot pass under the
                      appliance, the minimum height is 8 feet
                      above the floor.
    j.   Slide 24: 304.10.3 Crawl Space Supports
                   i. The North Carolina Mechanical Ad Hoc
                      Committee changed this section to
                      clarify the requirements.
                  ii. Read the new code text.
                 iii. Then go to next slide for discussion.
    k. Slide 25: 304.10.3 Crawl Space Supports (cont’d)
                 i. The unit shall be supported a minimum
                    of 2 inches above grade.
                ii. The minimum for duct clearance from
                    grade in a crawlspace is 4”.
               iii. Does this change that requirement? No.
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                 iv. Explain that in cases where the duct
                     connection to the appliance is close to
                     the bottom of the unit, the 4” above
                     grade requirement must still be met.
    l.   Slide 26: 306.5 Equipment and appliances on roofs
                      or elevated structures
                   i. Another clarification. Thank you!
                  ii. Read the code text and go to next slide.
    m. Slide 27: 306 New Section
                 i. This is the new part from the ICC.
                ii. Read this code text and go to next slide.
    n. Slide 28: 306 New Section (cont’d)
                 i. Some architects have argued that the
                    intent of the code is for roofs that are 16
                    feet above grade and that the parapet
                    wall has no effect on this section.
                ii. This change clarifies that the parapet
                    wall height is counted.
               iii. If the roof is less than 16 feet above
                    grade and the parapet wall is more than
                    16 feet above grade, the permanent
                    access shall still be provided.
               iv. What is meant by “periodic
                    maintenance”?
                v. Discuss what this means.
               vi. The intent is for any equipment that
                    must be periodically cleaned, inspected,
                    lubricated, parts changed out (like filters
                    and belts), etc. must have permanent
                    access.
              vii. Without permanent access, the
                    equipment or appliance will not be
                    properly maintained.
    o. Slide 29: Section 306.5
                i. Read this slide and go to next.
    p. Slide 30: 306.5 (cont’d)
                 i. Items 1 through 5 did not change.
                ii. Read item 6.
    q. Slide 31: 306.5 (cont’d)
                 i. The OSHA requirements are more
                    restrictive than the code requirements.
                ii. We do not enforce OSHA, they are
                    listed for your information only.
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    r. Slide 32: 307.2.2 Drain Materials and Pipe sizes
                 i. This is part of the section on condensate
                    disposal systems.
                ii. The requirements for joints and
                    connections have been added.
               iii. Read the new code text.
               iv. Go to next slide for discussion.
    s. Slide 33: 307 Discussion
                i. It is expected that a mechanical
                   inspector would know enough about
                   piping joints and connections to apply
                   the provisions of Chapter 7.
    t. Slide 34: Table 308.6
                 i. Table 308.6 is not shown here.
                ii. The North Carolina Committee believes
                    that there is an error in the last column,
                    second type of assembly.
               iii. All the other clearances in that column
                    list 3” except for this one.
               iv. The committee changed this one to 3”
                    as well.
    u. Slide 35: Section 308.7 Ammended
                 i. This is a comment to introduce the next
                    slide.
                ii. The North Carolina Mechanical
                    Committee changes Table 308.6 to
                    apply to unlisted equipment and
                    therefore changes section 308.7 as well.
    x. Slide 36: 308.7 Ammended
                 i. Read the text excluding the deleted text.
                ii. Go to next slide for explanation.
    y. Slide 37: Section 308 Discussion
              i.   If the equipment is not listed, but the
                   appliance label specifies a clearance,
                   that clearance is to be used.
    z. Slide 38: 312.1 Load Calculations
                i. Read this slide and go to next one.
    aa. Slide 39: Use of Manual S
                  i. Manual S is required in the 2012
                     International Mechanical Code.
                 ii. The      North   Carolina   Mechanical
                     Committee felt that this change is


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                      important so they brought it into the
                      North Carolina 2012 Mechanical Code.
               iii.   Manual S goes into more detail on
                      equipment sizing than Manual J.
               iv.     It provides sizing methods for the
                      different types of heating and cooling
                      equipment.
                v.    Is the inspector required to ask for proof
                      that the equipment was sized using
                      Manual S?
               vi.    Only if the inspector suspects that the
                      equipment is not properly sized.
              vii.    The inspector has the right to ask for
                      documentation       to     show      code
                      compliance.
              viii.   If you suspect that the load calculations
                      were not performed and Manuals J and
                      S were not used, you have the authority
                      to ask for documentation.
               ix.    It is the decision of the inspection
                      department      whether      to    require
                      calculations on all one and two family
                      dwellings.

Presenter Notes slides 15 – 39:




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End of Presenter Notes slides 15 – 39:

   4. Discuss the significant changes to Ventilation
      Chapter 4 of the 2012 NC Mechanical Code.
         a. Slide 40: Chap.4 Ventilation
                  i. Chapters 4 and 5 have quite a few
                      changes.
                 ii. Many of them are simply re-organizing
                      the chapters to more clearly divide
                      ventilation and exhaust and to group
                      some requirements together.
               iii. Requirements on exhaust were
                      removed from Chapter 4 and
                     requirements on ventilation were
                     removed from Chapter 5.
         b. Slide 41: 401.1 Scope
                i. This change clarifies that exhaust
                   systems are found in Chapter 5.
               ii. Read the existing and new code text.
         c. Slide 42: 401.4 Intake Opening Location
                 i. The word intake was added for
                    clarity.
                ii. This section applies to intake openings
                    only.
               iii. Exhaust openings are moved to
                    Chapter 5.
               iv. Read the code text.
         d. Slide 43: 401.4 Cont’d
               i.  These were removed because they refer
                   to exhaust.
         e. Slide 44: 401.4 Cont’d
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                 i.  These requirements were revised to
                    apply to outdoor intake openings only.
                ii. The exhaust opening requirements are
                    in Chapter 5.
        f. Slide 45: 401.4 Cont’d
               i. Read this code text and go to next slide.
        g. Slide 46: 401.4.1 Intake Openings
               i. This section was deleted because the
                  requirements were re-organized and
                  placed in the previous section.
        h. Slide 47: 401.4.1 Intake Openings (Cont’d)
               i. This section was deleted because the
                  requirements were re-organized and
                  placed in the previous section
        i. Slide 48: 401 Cont’d
               i. This section was deleted because the
                  requirements were re-organized and
                  placed in the previous section.
        j.   Slide 49: 401.5 Cont’d
                 i. Here they deleted the reference to
                    exhaust.
        k. Slide 50: 401.5 Cont’d
                i. The table is not shown here, only the
                   first line was deleted because it refers to
                   exhaust openings.
               ii. All other items in the table are for
                   outdoor intake openings.
              iii. The requirements have not changed.
        l.   Slide 51: 403 Mechanical Ventilation
                 i. This section of the code is a substantial
                    revision from the 2009 code.
        k. Slide 52: Section 403
                i. Here is what this revision will do:
               ii. The airflow requirements will change.
              iii. The way they are calculated changes,
                   there are more variables introduced.
              iv. In some occupancies, the outdoor intake
                   rate will be lower as a result of this
                   change.
               v. In some occupancies, the outdoor intake
                   rate will increase.
              vi. This change is very similar to the
                   requirements in ASHRAE 62

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              vii. The requirements in our code have not
                    substantially changed is several years.
              viii. ASHRAE has been conducting studies
                    on indoor air quality for many years.
               ix. The changes reflect what they have
                    learned and provides for a better way to
                    determine the amount of outdoor air
                    needed to provide for a healthy indoor
                    environment without overly ventilating
                    the building.

Notes Presenter slides 40 – 52:




End of Presenter Notes slides 40 – 52:


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  5. Discuss the significant changes to Definitions
     Chapter 2 of the 2012 NC Mechanical Code.
        a. Slide 53: Breathing Zone
                i. We will first go over the definitions from
                   Chapter 2 that apply to Chapter 4.
               ii. The breathing zone was described in
                   the 2009 code in Chapter 4.
              iii. It has been moved to Chapter 2.
              iv. Read this code text.
        b. Slide 54: Net Occupiable Floor Area
               i. Read this section and go to next slide.
        c. Slide 55: Occupiable Space
               i. Read this section and go to next slide
        d.   Slide 56: Zone
                 ii. Read this section and go to next slide

  6. Discuss the significant changes to Ventilation
     Chapter 4 of the 2012 NC Mechanical Code.
        d. Slide 57: Ventilation System
              i.  This portion of 403.1 has not changed.
             ii.  Read this section and go to next slide
        e. Slide 58: Ventilation Supply System
              i.  This was deleted.
             ii.  Part of it was moved to Chapter 2.
        f. Slide 59: System Operation
              i.  This was deleted and replaced with
                  new text.
        g. Slide 60: Zone Outdoor Airflow
              i.  Read this text.
             ii.  A new term is introduced here: space
                  air distribution effectiveness.
            iii.  This will be explained shortly.

        h. Slide 61: Breathing Zone Outdoor Airflow
              i.  Read this text.
             ii.  This new equation is in two parts.
            iii.  Let’s see what this means.

        i.   Slide 62: Breathing Zone Outdoor Airflow
             cont’d
                i.  Read this text.
               ii.  Go to next slide for summary.

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        j.   Slide 63: Breathing Zone Outdoor Airflow
             cont’d
                i.  This equation has two components, the
                    people outdoor air requirement and the
                    area or building outdoor air requirement.
               ii.  ASHRAE studies found that the building
                    and its contents played a significant role
                    in the quality of the indoor air separate
                    from the occupants and their activities.
              iii.  They divided the calculation into two
                    part to account for both the people and
                    the building. In many cases they people
                    rate has been lowered.

        k. Slide 64: Breathing Zone Outdoor Airflow
           cont’d
              i.  Zone air distribution effectiveness is a
                  new term that accounts for the
                  arrangement of the air distribution
                  components, the registers, grilles, and
                  diffusers.
             ii.  The zone outdoor airflow rate is a
                  modification of the breathing zone rate
                  to account for the effectiveness of the air
                  distribution system.

        l.   Slide 65: Breathing Zone Outdoor Airflow
             cont’d
                i.  These are the significant factors that this
                    change addresses.
               ii.  The ICC and ASHRAE have in recent
                    years started working more closely
                    together to provide a healthier and safer
                    built environment.
              iii.   ASHRAE still provides standards that
                    are more performance based while the
                    ICC Codes are generally more
                    prescriptive.

        m. Slide 66: Zone Air Distribution
              i.  This is the table used to account for air
                  distribution effectiveness.
             ii.  Read a couple of lines from the Table.
                  (The class may have trouble seeing this)



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        n. Slide 67: Table 403.3.1.2
              i.  The footnotes clarify the meaning of the
                  terms in the Table.
             ii.  Read the footnotes.
            iii.  When you read footnote c, ask the
                  class, “ What is the height of the
                  breathing zone?’
            iv.   Explain that a ceiling diffuser is a
                  diffuser above 72” from the floor, not just
                  in the ceiling itself.
             v.   So a wall diffuser at 8’ would be a ceiling
                  diffuser.
            vi.   Ask where the bottom of the breathing
                  zone is. (3”)

        o. Slide 68: Table 403.3.1.2 Footnotes
              i.  Read the text.
             ii.  Note f addresses the type of diffusers
                  that would be used to provide better air
                  distribution.
        p. Slide 69: Table 403.3.1.2 Footnotes
              i.  Footnote g. provides for no penalty
                  when diffusers are selected to provide
                  better air movement and the
                  temperature difference is low enough
                  between the supply air and room air to
                  provide for less turbulence at the ceiling
                  and better air flow
        q. Slide 70: 403.3 Ventilation Outdoor Airflow
           Rate
              i.  Read this text.
             ii.  Go to next slide.
        r. Slide 71: 403.3 Cont’d
                 i.   This section allows the user to select
                      an occupancy most similar to one in
                      the table.
                ii.   The table has been revised into
                      more section and provided more
                      occupancies specific to different
                      types of buildings .




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        s. Slide 72: 403.3 Cont’d
                  i.  Smoking is no longer allowed in
                      many buildings.
                 ii.  This section reflects that change.
                      The ventilation rates in the Table do
                      not take smoking into account.
                iii.   Where a building is expected to be
                      occupied with the allowance of
                      smoking this must be taken into
                      account.
        t. Slide 73: 403.3 Cont’d
                 i.   Approved statistical data can be
                      used for occupancies that may be
                      significantly different from those
                      found in the Tables.
        u. Slide 74: 403 Excerpt from Table
                  i.  This is an excerpt from the table.
                 ii.  Note that there are now 5 columns.
                      This section shows correctional
                      facilities.
                iii.   Note that there are more
                      occupancies than previously
                      provided.
                iv.   Also note that and exhaust airflow
                      rate column is provided where is
                      exhaust is required.

       v. Slide 75: 403 Example Calculation
                   i. This is an example that will show the
                      2009 code calculations and the 2012
                      calculations.
                  ii. This is a facility that would be
                      calculated by a registered
                      professional, but it is important that
                      the code official be familiar with the
                      terms and the calculation method.
                 iii. These are the parameters on which
                      the design is based:
                iv.   Read the slide.
       w. Slide 76: 403 Example Cont’d
                 i.  Read the remaining parameters.
                     This describes the heating and
                     cooling system.


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       x. Slide 77: 403 Calculations for 2009
                   i. This is the procedure for the 2009
                      NCMC.
                  ii. Read through and explain as you go.
                 iii. 20p means 20 persons, cfm/p
                      means cfm per person.
       y. Slide 78: 403 Calculations for 2009 Cont’d
                 i.   Continue to read and discuss.
       z. Slide 79: 403 Calculations for 2009 Cont’d
                  i.  Continue to read and discuss. I
                      decided that a game room was close
                      to a day room, since there was no
                      day room in the table.
                 ii.  I used a lobby for the waiting area.
       aa. Slide 80: 403 Calculations for 2009 Cont’d
                  i.   Continue to read and discuss.
       bb. Slide 81: 403 Calculations for 2009 Cont’d
                  i.   Continue to read and discuss.
       cc. Slide 82: 403 Summarize 2009 Calculations
                    i. Totals: The sum of these airflows is
                       shown.
                   ii. Note the quantity and ask the class
                       to remember that number.
                  iii. You can say, “about 5600”.
       dd. Slide 83: 403 Calculations for 2012
                    i. Now we will calculate the outdoor air
                       rate using the 2012 code.
                   ii. Note again that there are two parts
                       to this initial calculation for the
                       breathing zone airflow rate.
                  iii. Explain as you go.

       ee. Slide 84: 403 Calculations for 2012
                   i.  Note again that there are two parts
                       to this initial calculation for the
                       breathing zone airflow rate.
                  ii.  Explain as you go.
       ff. Slide 85: 403 Calculations for 2012
                   i.  Note again that there are two parts
                       to this initial calculation for the
                       breathing zone airflow rate.
                  ii.  Explain as you go.
       gg. Slide 86: 403 Calculations for 2012
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                 i.    Note again that there are two parts
                       to this initial calculation for the
                       breathing zone airflow rate.
                 ii.   Explain as you go.
       hh. Slide 86: 403 Calculations for 2012
                   i.  Note again that there are two parts
                       to this initial calculation for the
                       breathing zone airflow rate.
                  ii.  Explain as you go.
       ii. Slide 87: 403 Calculations for 2012
                    i. Note again that there are two parts
                       to this initial calculation for the
                       breathing zone airflow rate.
                   ii. Explain as you go.
                  iii. For this one we actually has a
                       dayroom in the Table.
       jj. Slide 88: 403 Calculations for 2012
                    i. Note again that there are two parts
                       to this initial calculation for the
                       breathing zone airflow rate.
                   ii. Explain as you go.
                  iii. There is a waiting room in the 2012
                       Table.
       kk. Slide 89: 403 Calculations for 2012
                  i.   Note that Table 403.3 requires that
                       the air be exhausted from the
                       restrooms.
       ll. Slide 90: 403 Calculations for 2012
                  i.   Corridors only have the area rate
                       requirement.
       mm. Slide 91: 403 Summarize 2012 Calculations
                 i.  Totals for the correctional facility in
                     the 2012 code are 2105 of outdoor
                     air. What was the requirement in the
                     2009 code? (5600).
                ii.  The exhausted air does have to be
                     made up.
               iii.  But wait! We are not finished.
               iv.   This is the breathing zone outdoor
                     airflow from Section 403.3.1.1,
                     equation 4-1.
                v.   Now we must go to Section
                     403.3.1.2 and look at zone air
                     distribution effectiveness.
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       nn. Slide 92: 403 Zone Air Calculations 2012
                    i. The zone air distribution
                       effectiveness is determined in
                       accordance with Table 403.3.1.2.
                       We have said that the day room has
                       a ceiling supply and return.
                   ii. Looking at the table we see that for a
                       ceiling or floor supply of cool air, the
                       zone air distribution effectiveness is
                       equal to 1.0.
                  iii. What does footnote f say? This
                       footnote does not apply.
                 iv.   Now look at heating. Table
                       403.3.1.2, we have a ceiling supply
                       and return of warm air in heating
                       mode. So the effectiveness is 0.8.
                   v.  The breathing zone rate for the day
                       room was calculated to be 210 cfm.
                 vi.     Using equation 4-2, the zone
                       outdoor airflow is the breathing zone
                       airflow divided by the zone air
                       distribution effectiveness.
                 vii.   In this case it is 210 cfm divided by
                       0.8, which gives us 263 cfm.
                viii.  We must use the worse case
                       effectiveness.



       oo. Slide 93: 403 Calculations 2012 Cont’d
                  i.   Simply read through this and ask if
                       there are any questions so far.
       pp. Slide 94: 403 Calculations 2012 Cont’d
                   i.  How do we know that the velocity is
                       150 fpm at 4.5 feet above the floor?
                  ii.   From the performance data on the
                       diffusers.

       qq. Slide 95: 403 Calculations 2012 Cont’d
                    i. This is the calculation for the waiting
                       room.
                   ii.  It also has a ceiling supply and
                       return.
                  iii. We use the same effectiveness
                       factor as before.
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       rr. Slide 96: 403 Calculations 2012 Cont’d
                  i.   Read through this one.
       ss. Slide 97: 403 Calculations 2012 Cont’d
                    i. Look at the Table for the
                       effectiveness of the restroom
                       exhaust.
                   ii. Next to last line in the Table says
                       “Makeup air drawn in on the opposite
                       side of the room from the exhaust
                       and/or return” and has an
                       effectiveness of 0.8.
                  iii. Doing the math, we get 438 cfm for
                       our zone outdoor air.
       tt. Slide 98: 403 Calculations 2012 Cont’d
                   i.  The same applies in the cells.
                  ii.  The zone outdoor air rate goes up to
                       438 cfm.
       uu. Slide 99: 403 Summary of Calculations 2012
                    i. Here are the totals. Our total
                       outdoor air required is 2497.
                  iii.  This is still lower than the amount
                       required in the 2009 code.
       vv. Slide 100: 403.3.2 Common Ventilation
                  i.   This section is replaced with several
                       new sections.
        ww. Slide 101: 403.3.2 Common Ventilation
                 i. We now have to use the calculated
                    zone outdoor airflow rates to
                    determine the system outdoor air
                    required.
                ii. Read this section of code.
               iii. There are three methods based on
                    the type of system is used.
        xx. Slide 102: 403.3.2.1 Single Zone Systems
                   i. Read this code section.
                  ii. For a system has only one zone,
                      usually only one thermostat, then the
                      total outdoor rate for the system is
                      the zone outdoor air rate.
                 iii. We are finished calculating the
                      required outdoor air rate.




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        yy. Slide 103: 403.3.2.2
            100% Outdoor Air Systems
                  i.  When the system does not have
                      return air, in other words, does not
                      recirculate air, then the system
                      outdoor air rate is simply the sum of
                      all of the zone outdoor air flow rates.
                 ii.  In this case we are finished
                      calculating the required outdoor air
                      rate for the system.
        zz. Slide 104: 403.3.2.3 Multiple Zone
                      Recirculating Systems
                   i. This is where it gets complicated.
                  ii. For multiple zone systems that
                      recirculate air we do the following:
                 iii. Read the code section.
                 iv.  We have four steps to determine the
                      final outdoor air rate required by the
                      system.

       aaa. Slide 107: 403.3.2.3.1 Primary Outdoor
                      Air Fraction
                  i.  We must calculate the primary
                      outdoor air fraction.
                 ii.  This is the zone outdoor air rate
                      divided by the primary airflow rate.

        bbb.           Slide 108: 403 Primary Air Flow
                  i.       The primary airflow used in the
                           calculation is the lowest expected
                           primary airflow rate when the zone is
                           fully occupied.
        ccc.         Slide 109: 403.3.2.3.2 System
                     Ventilation
                          Efficiency
                  i.     Next we find the system ventilation
                         efficiency.
                 ii.     Read the code text.
                iii.     Note that Appendix A from the
                         ASHRAE Standard can be used
                         instead of the Table.
                iv.      The appendix has a calculation
                         method that is more accurate.



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        ddd.         Slide 110: 403.3.2.3.2 System
                     Ventilation Efficiency Cont’d
                  i.     First find Zp using equation 4-5,
                         then go to the Table and select the
                         corresponding efficiency factor.
                 ii.      Note that the footnote allows
                         interpolation between values.
                iii.      The Zp shall be the largest Zp
                         calculated for that system.

        eee.         Slide 111: 403 System Calculations
                  i.     Here is an example from our
                         correctional facility.
                 ii.     We had 882 cfm of outdoor air in
                         dining hall and 2000 cfm supply air.
                iii.     That gives us a primary air fraction of
                         0.44.
                iv.      From Table 403.3.2.3.2, our
                         efficiency is 0.7.
                 v.       We could interpolate and get an
                         efficiency of 0.71.
        fff. Slide 112: 403.3.2.3.3 Uncorrected Outdoor
                        Air Intake
                   i.  Now we calculate an uncorrected
                       outdoor air intake.
                  ii.   This is simply the sum of all of the
                       zone outdoor airflow rates that we
                       previously calculated with one
                       change.
       ggg. Slide 113: 403 Calculation
                   i. The change is the diversity.
                  ii.  We can apply and occupant
                      diversity factor to the people outdoor
                      airflow rate.
                 iii.  Note that this diversity factor does
                      not apply to the area airflow rate.
                 iv.  Now what do they mean by system
                      population Ps?
       hhh. Slide 114: 403 Calculation
                     i.  It is the maximum number of
                         people expected to be in all the
                         zones at one time.
                    ii.  Read the text.

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                     iii.   Caution: This diversity factor can
                            bring the outdoor airflow rate to a
                            very low rate. There may be
                            times when an inappropriate
                            diversity factor may be used. If
                            you see airflow rates that look
                            very low, too low, check this
                            diversity factor first.
                     iv.    Have you heard the argument on
                            an office building that the people
                            in the conference room are all
                            people who work in the building,
                            so they will not be in their offices
                            while the conference room is
                            occupied?

                     v.     This may or may not be true. In
                            many cases, conference rooms
                            are used for meetings with
                            guests.
                     vi.     I am sure you can think of times
                            that you have been in an office
                            building conference room when
                            only two or three people who
                            work in the building are in the
                            conference room and several
                            outside guests are there.
                    vii.    Note that the code says the
                            maximum number of occupants.
       iii. Slide 115: 403 Diversity
                       i.  Here is an example of how
                           diversity can be used.
                      ii.  For our correctional facility:
                     iii.  Read the text.
       jjj. Slide 116: 403 Inmates
                       i.  The system population is ten
                           inmates with ten visitors, plus 30
                           inmates, plus six guards plus two
                           office workers.
       kkk. Slide 117: 403 Inmates Cont’d
                     i.  The sum of the populations of all
                         the zones is the 80 persons in the
                         cells, the 70 people in the dining
                         hall, the 6 guards


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       lll.   Slide 117: 403 Inmates Cont’d
                     i.   The sum of the populations of all
                          the zones is the 80 persons in the
                          cells, the 70 people in the dining
                          hall, the 6 guard
       mmm. Slide 118: 403 Summary
                   i.   The two office workers, the 30
                        people in the day room and the
                        20 people in the waiting room.

       nnn.   Slide 119: 403 Summary Cont’d
                     i.   That gives us a total population of
                          208

       ooo.   Slide 120: 403 Summary Cont’d
                     i.   We divide the expected system
                          population by the sum of the
                          zone populations and get a
                          diversity factor of 0.28.
       ppp.   Slide 121: 403 Summary cont’d
                      i.  Now let’s get a look at a different
                          scenario.
                     ii.  Read text.
       qqq.   Slide 122: 403 Zone Populations
                     i.   The sum of the zone populations
                          does not change.
                     ii.   This time we get a diversity factor
                           of 0.41.
                    iii.   What does that do to our outdoor
                           airflow rate?
       rrr.   Slide 123: 403 Outdoor Airflow Rate
                       i. For the first example, we have
                          reduced our outdoor airflow rate
                          from 2015 to 1104.
                      ii. For the second example, we
                          have reduced our outdoor airflow
                          rate to 1269.
                     iii. Diversity can make quite a
                          difference.
       sss.   Slide 124: 403.3.2.3.4 Outdoor Air Intake
                          Flow Rate
                     i.   Now we can apply system
                          efficiency.

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       ttt.   Slide 125: 403.3.2.3.2 Outdoor Air Intake
                          Flow Rate
                       i. We calculated a primary air
                          fraction of 0.44.
                      ii. The first value of Vot is with a
                          diversity of 0.28.
                     iii. The second value of Vot is with a
                          diversity of 0.41
       uuu.   Slide 126: 403.4 Exhaust Ventilation
                       i. This is the section on make-up air
                          for the exhaust air.
                      ii. Note that makeup air can be from
                          other zones, except where limited
                          by Section 403.2.
                     iii. Read section
       vvv.   Slide 127: 403.6 Variable Air Volume
                          System Control
                      i.  Read Section.
                     ii.  The control system must be able
                          to regulate the outdoor air
                          throughout the system to provide
                          outdoor air to each zone as part
                          of the supply air.
       www. Slide 128: 403.7 Balancing
                   i.   The system must be balanced to
                        achieve the minimum ventilation
                        airflow rate.
       xxx.   Slide 129: 403 Example 2
                       i. This example is similar to the
                          example in the 2009 International
                          Mechanical Code Commentary.
                          We will do this one together.
                      ii.  If you have a calculator, or a
                          calculator feature on your cell
                          phone, please follow along.
                     iii.  It will mean more to you if you go
                          through the calculations yourself.
                    iv.   Note to instructor to go through
                          this slowly to allow time for them
                          to perform the calculations.
                      v.  You may obtain a spreadsheet
                          from Janie Sutton at DOI for the
                          purpose of this exercise by
                          emailing her at
                          janie.sutton@ncdoi.gov.
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                  vi.     The spreadsheet has numbered
                         columns and the supply airflow
                         rates and zone areas are already
                         filled in.
                  vii.   Try to make sure the class
                         understands at least the first part
                         through section 403.3.2.2.
                 viii.   Encourage Level II and Level III
                         Mechanical Inspectors to study
                         the entire section.
                  ix.    If you are using the spreadsheet,
                         note that the areas are already
                         listed on the spreadsheet.
        yyy.     Slide 130: 403 Example 2 cont’d
                  x.    Read this information and
                        proceed to next slide,
        zzz.     Slide 131: 403 Example 2 cont’d
                    i.  If you are using the spreadsheet,
                        note that these values are
                        entered on the spreadsheet for
                        the class.
        aaaa.     Slide 132: 403 Example 2 Step 1
                   ii.  Step 1. First we will determine
                        the occupant loads for all zones
                        and enter them on our
                        spreadsheet.
                  iii.  For the conference room, from
                        Table 403.3 under the Offices
                        section, a conference room has
                        an occupant density of 50 people
                        per 1000 square feet.
                  iv.   Enter the number 50 in column 4
                        of the spreadsheet in the
                        conference room row.
                   v.   The area is already entered, so
                        divide 50 by 1000 and multiply by
                        280.
                  vi.    Enter 14 under column 5.

        bbbb.     Slide 133: 403 Example 2 Step 1
                  cont’d
                   i.   Do the same for the data center.
                        Find data center in the Table and
                        enter the occupant density under

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                             column 4. Do the calculation.
                             Did you get 7.2?
                     ii.     What about the decimal places?
                    iii.     Do we carry them or round up or
                             down?
                         iv. It doesn’t really matter that much.
                             When I am using a spreadsheet I
                             usually leave them in until the
                             end. It will not make much
                             difference at all in the airflow rate.
     cccc. Slide 134: 403 Example 2 Step 1 cont’d
                      i. Do the same procedure for the
                         reception area. Enter 30 people
                         for the occupant density, divide by
                         1000 and multiply by the area.
                     ii. Did you get 3.6? Any questions
                         so far?
                    iii. (If so, repeat the question for all to
                         hear and explain. Go back if
                         necessary.)

     dddd. Slide 135: 403 Example 2 Step 1 cont’d
                      i. Proceed the same way for the
                         office space.
                   ii. Note that the density is 5 for the
                         2012 code and was 7 for the 2009
                         code.
     eeee. Slide 136:403 Example 2 Step 2
                     i. Enter the people OA rate in
                        column 3. 5 cfm for the
                        conference room. (Have them
                        look it up in the Table and tell you
                        what it is.)
                    ii. Note that for this building all of the
                        area airflow rates are the same.
                        0.06 is entered in column 6.
     ffff.   Slide 137:403 Example 2 Step 2 cont’d
                      i.  This is the calculation for the
                          conference room.
                     ii.  The breathing zone airflow rates
                          are broken out separately. When
                          density is applied, they must be
                          separated because the density
                          factor is not applied to the area
                          rate.

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                     iii.   In column 7 enter the total of 5
                            cfm/p x 14p = 70.
                    iv.     Do the calculation for the area
                            rate and enter it: 16.8.
                     v.     In column 9 enter the Total
                            breathing zone airflow rate of
                            86.8.

        gggg. Slide 138:403 Example 2 Step 2 cont’d
                     i. Do the same for the data center.
                        By now, someone might
                        recognize the people outdoor air
                        rate is the same for all
                        occupancies in this building.
                    ii. In column 3, enter 5 cfm, column
                        7 enter 36.
                   iii. In column 8, enter 7.2, and
                        column 9 enter 43.2.
        hhhh. Slide 139:403 Example 2 Step 2 cont’d
                    i.  In column 3, enter 5 cfm, column
                        7 enter 18.
                   ii.  In column 8, enter 7.2, and
                        column 9 enter 25.2.
        iiii.   Slide 140:403 Example 2 Step 2 cont’d
                      i.  In column 3, enter 5 cfm, column
                          7 enter 137.
                     ii.  In column 8, enter 328.8, and
                          column 9 enter 465.8.
        jjjj.   Slide 141:403 Example 2 Step 3
                      i.  Determine the efficiency for each
                          zone, then the outdoor airflow
                          rate for each zone.
        kkkk.   Slide 142:403 Example 2 Step 3 cont’d
                       i.    The default efficiency in the Table
                             is 1. This is column 10.
                      ii.    (Read the text on the slide.)
                     iii.    Enter the efficiency in column 10.
                     iv.      Remember we must use worse
                             case.
        llll.        Slide 143:403 Example 2 Step 3 cont’d
                  i.         Multiply column 9 by column 10
                             and enter result in column 11.
                 ii.         Continue for all four zones.


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                iii.          Instructor: Check with class to
                              see if they are understanding.
                iv.            Ask as you go what the answers
                              are. If they don’t understand, go
                              back and do it again.
        mmmm.          Slide 144:403 Example 2 Step 3 cont’d
            i.             Enter the rest of the calculated
                           values on the spreadsheet.
        nnnn. Slide 145:403 Example 2 Step 4
                 i.  Now we must determine values for
                     the primary air fraction.
                ii.   This is the zone outdoor air value
                     (column 11) divided by the primary
                     air value (column 12).
               iii.  This value goes in column 13.
        oooo. Slide 146:403 Example 2 Step 4 cont’d
                 i.  For the conference room, column 11
                     has 108.5 and column 12 has 440
                     cfm.
                ii.  When divided, you get?
               iii.   That value goes in column 15.
        pppp.    Slide 147:403 Example 2 Step 4 cont’d
                      i.  Do the same thing for the three
                          remaining zones.
        qqqq.    Slide 148:403 Example 2 Step 5
                       i. Now look at the values in column
                          13 (Zp). What is the largest
                          number?
                      ii. That is the number used to
                          determine the system efficiency.
                          Using that number, 0.25, go to
                          the Table.
                     iii.  The system efficiency is 0.9.
                        iv.   Enter 0.9 in column 14 on the last
                              line, the line marked “Totals”.
        rrrr.    Slide 149:403 Example 2 Step 6
                         i.   On this example we are going to
                              use a diversity of 1.
                        ii.   A diversity of 1 is always allowed
                              because it will not lower the
                              outdoor airflow rate.



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                   iii.   The diversity is entered in column
                          15 on the last line where the
                          totals are.
                   iv.    If diversity was used, you would
                          multiply it by the total in column 1
                          and add that value to the total in
                          column 8. This number would go
                          in column 18.
                    v.    Since our diversity is one, we can
                          simply use the total in column 9,
                          last line.
        ssss.   Slide 150:403 Example 2 Step 6 cont’d
                      i. Here is what is happening.
                     ii.  Since all the occupant densities
                         are the same, and all the area
                         rates are the same,
                    iii. we can multiply the occupant
                         density by the total of all zone
                         populations (it is broken out by
                         zones here) and
                    iv.  multiply the area rate by the total
                         building area to get the
                         uncorrected outdoor airflow rate.
                     v.  This number goes into column
                         18.
        tttt.   Slide 151:403 Example 2 Step 7
                      i. Now we apply the system
                         efficiency to the uncorrected
                         outdoor airflow rate to get the
                         required system outdoor airflow
                         rate.
                     ii. In the last row, “Totals”, place the
                         result in column 17.
                    iii.  You will be dividing column 16 by
                         column 14.




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Notes Presenter slides 53 – 152:




End of Presenter slides 57 – 152:



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  7. Discuss the significant changes to Ventilation
     Chapter 5 Exhaust Systems of the 2012 NC
     Mechanical Code.
        a. Slide 153: Chapter 5 Exhaust Systems
                    i.  This was mentioned at the
                        beginning of Chapter 4. In
                        Chapter 4, we saw where the
                        exhaust requirements were
                        removed.
                   ii.  Now we will see where ventilation
                        requirements are removed from
                        Chapter 5, and requirements for
                        exhaust that were in Chapter 4
                        are moved to Chapter 5.
        b. Slide 154: Chapter 5 Exhaust Systems
                    i.  Read slide and go to next slide.

        c. Slide 155: 501.2.1 Location of Exhaust Outlets
                     i. 1 and 2 are other than
                        environmental air.
                    ii. Read the new item.
                   iii. Comment on the word all and the
                        removal of the word duct. This
                        item applies to all environmental
                        air exhaust, whether ducted or
                        not.

        d. Slide 156: 501.2.1 Location of Exhaust
                  Outlets Cont’d.
                    i.   Simply read this section and go
                         to next slide.
        e. Slide 157: 501.2.1 Location of Exhaust
                  Outlets Cont’d.
                    i.   Simply read this section and go
                         to next slide.
        f. Slide 158: 501.2.1.1 Exhaust Discharge
                    i.  Read this section and discuss.
                        What do they mean by directed?
                   ii.  Does this mean that an exhaust
                        fan cannot be placed above a
                        walkway?




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                     iii.   (No. If the exhaust is high
                            enough to keep the airflow from
                            passing onto walkers and the
                            airflow is not directed downward,
                            the intent of this section has been
                            met.)

        g. Slide 159: 501.2.2 Exhaust Opening
                  Protection
                    i.  Read this slide and move to next
                        slide.
        h. Slide 160: 501.2.2 Exhaust Opening Protection
                        cont’d.
                    i.  This section covers the
                        requirement that was in the Table
                        in Chapter 4.
                   ii.  Since there is only one
                        requirement for protecting
                        exhaust openings, it was entered
                        in paragraph form.
        i.   Slide 161: 501.3 Exhaust Opening Protection
                          cont’d.
                      i.  This is an introduction to the next
                          slide.
        j.   Slide 162: 501.3 Pressure Equalization
                       i. The exception is intended to not
                          require makeup air for exhaust
                          systems in residential
                          occupancies unless specified
                          elsewhere in the code.
                      ii. R-2 is non-transient multi-family
                          housing such as apartment
                          buildings, dormitories, and
                          boarding houses.
                     iii. R-3 is institutional residential,
                          where the occupants are non-
                          transient, such as day care for
                          adults or children, and 6
                          occupants or less.
                     iv.  The code change allows dwelling
                          units in R-2 occupancies to not
                          have neutral or negative pressure
                          maintained.


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                     v.   The exception if for residential:
                          one and two-family dwellings and
                          townhouses.
        k. Slide 163: 504.5 Makeup Air
                    i.  This change removes the
                        requirement for makeup air for
                        clothes dryers exhausting more
                        than 200 cfm.
                   ii.   It simply states that make-up air
                        be provided by an opening or
                        other means.
        l.   Slide 164: Section 504 Discussion
                      i.  Read and discuss this slide.
                     ii.  Discuss effective area.

        m. Slide 165: 504.6 Domestic Clothes Dryer Ducts
                    i.  Read or paraphrase this slide
                        and move to the next.
        n. Slide 166: 504.6 Domestic Clothes Dryer Ducts
                    i.  You do not need to read the
                        deleted text.
                   ii.  Inform the class that this section
                        has changed.
        o. Slide 167: 504.6 Domestic Clothes Dryer
                         Ducts cont’d.
                    i.  This has been re-written.
        p. Slide 168: 504.6 Domestic Clothes Dryer
                         Ducts cont’d.
                     i. The exception has not been
                        deleted. It simply has been
                        moved.
                    ii. Note that in the current code, it
                        reads 200 square feet, this is an
                        error.
                   iii.  It should read 200 square
                        inches.
        q. Slide 169: Section 504.6 Deletions
                    i.  The maximum length requirement
                        and how it is determined have
                        changed.
        r. Slide 170: 504.6.1 Deletions cont’d.
                    i.  This has been re-organized.


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        s. Slide 171: 504.6.2 Deletions cont’d
                    i.  This has been changed.
        t. Slide 172: Section 504 New
                     i. New Code. We now have seven
                        sub-sections describing the
                        requirements for domestic
                        clothes dryer exhaust.
                    ii. Number one: Read 504.6.1.
                        Note that the duct shall be
                        constructed of metal.
                   iii.  The question came up in some
                        classes as to whether you can
                        use pvc duct for clothes dryer
                        exhaust under the slab.
                   iv.   This section makes it clear that
                        pvc is not allowed.

        u. Slide 173: Section 504 New
                    i.  Ask the class why the duct shall
                        extend into the fitting in the
                        direction of airflow. Why can’t
                        they use screws?
                   ii.  The inside of the duct must be
                        smooth with no ridges or
                        protrusions of any kind to that the
                        clothes dryer lint will not catch
                        and block the duct.
        v. Slide 174: Section 504 New Amendment
                    i.  Here is the North Carolina
                        amendment exception. The 200
                        square feet was changed to 200
                        square inches.
        w. Slide 175: 504.6.3 Transistion Ducts
                    i.  Read this slide and go to the next
                        slide.
        x. Slide 176: Section 504 New Amendments
                    i.  This section describes the two
                        methods of determining the
                        maximum allowable duct length.
                   ii.  First listed is the specified length.




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                     iii.    The maximum length has been
                            changed to 35 feet. The previous
                            IMC had 25 feet, North Carolina
                            amendment changed it to 45 feet.
                            The BCC Mechanical Ad Hoc
                            Committee decided to stay with
                            the ICC change.
                     iv.    We now have a table defining the
                            equivalent length of the fittings.

          y. Slide 177: Table 504.6.4.1
                       i. Read some of this table to the
                          class.
                      ii.  Note that there are several sizes
                          of fittings.
                     iii.  For a single dryer, section
                          504.6.1 requires the duct to be 4”
                          in diameter.
          z. Slide 178: Table 504.6.4.2 Mfgr’s Instructions
                       i. This is the second method.
                          The clothes dryer manufacturer’s
                          installation instructions may be
                          used instead of the equivalent
                          length method.
                      ii. If you cannot route the duct to the
                          exterior in the specified maximum
                          length, what alternatives do you
                          have?
                     iii. Relocate the clothes dryer, or
                          provide a condensing dryer that
                          does not require an exhaust.
                     iv.   Booster fans are not allowed
                          because there is no fan available
                          that is listed for such use.
                      v.  To our knowledge there is not yet
                          a listing for a clothes dryer duct
                          booster fan.
           aa. Slide 179: 504.6.5 Length Identification
                        i.  This section was amended by the
                            North Carolina Building Code
                            Council to require equivalent
                            length label or tag in any case,
                            whether concealed within
                            construction or not.
                       ii.  This is important information for
                            the owner or installer to know.
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                    iii.   From NFPA statistics on house
                           fires:Clothes dryers accounted for
                           the largest share of appliance
                           and tool fires between 1994-
                           1998.
                    iv.    There were 14,300 clothes dryer
                           fires in U.S. homes in 1998,
                           resulting in 19 deaths, 312
                           injuries and $67.7 million in direct
                           property damage.
                    v.     The leading cause of home
                           clothes dryer fires was lack of
                           maintenance (30%), followed by
                           unidentified or unknown-type
                           mechanical failure (11%) and part
                           failure, leak or break (10%).
                    vi.    Clothing (not on a person) was
                           the most common source of
                           ignition in home clothes dryer
                           fires, followed by dust, fiber or
                           lint.
       bb. Slide 180: Table 504.6.6 Exhaust Duct Req’d
                    i.  If there is no exhaust duct system
                        installed, the condensing clothes
                        dryer shall be installed prior to
                        occupancy!
                   ii.   No dryer = no C.O.
                  iii.  This section is not intended to
                        require a tag or label stating that
                        there is no clothes dryer exhaust
                        system.
                  iv.   Those little boxes you see at the
                        “big box” store that sit on the floor
                        of the laundry room and collect
                        clothes dryer lint are not an
                        acceptable alternate to an exhaust
                        system ducted to the outdoors.
       cc. Slide 181: Table 504.6.6 Exhaust Duct Req’d
                    i.  The Table has 4” mitered, and 6”
                        smooth.
                   ii.   When the equivalent length
                        information is not on the Table,
                        you can use the tables supplied
                        by SMACNA or ASHRAE for that
                        fitting.

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                     iii.   North Carolina Building Code
                            Committee had decided that 25
                            feet was to restrictive, when ICC
                            changed it to 35 feet, the
                            Committee decided to not amend
                            it to 45 feet.
       dd. Slide 182: Section 504.8 New
                     i. This is the first time that a
                        common shaft for multiple clothes
                        dryers is addressed.
                    ii. This set of requirements are
                        based on designs that have been
                        used successfully in several
                        jurisdictions in the U.S.
                   iii. The provisions address issues to
                        make sure the velocity in the
                        exhaust system is maintained,
                        moisture is controlled so that
                        building components will not be
                        damaged, and lint in the system
                        does not build up to where it
                        would create a hazard.
       ee. Slide 183: 504.8 New requirements
                    i.  Read this slide and go to next
                        one.
       ff.   Slide 184: 504.8 New requirements # 1& 2
                     i.   Read this slide and go to next
                          one.
       gg. Slide 185: 504.8 New requirements #3
                    i.  Read this slide and go to next
                        one.
       hh. Slide 186: 504.8 New requirements # 4-7
                    i.  Read this slide and go to next
                        one.
       ii.   Slide 187: 504.8 New requirements # 8-11
                      i.  Read this slide and go to next
                          one.
       jj.   Slide 188: 504.8 Diagram
                      i.  This is a diagram of the
                          requirements of this section.
                     ii.  Point out each item on the
                          diagram.


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                    iii.   The next slides review these
                           requirements in more detail.
       kk. Slide 189: 504.8 # 2
                    i.  #2. Dampers shall be prohibited
                        in the exhaust duct. Penetrations
                        of the shaft and ductwork shall be
                        protected in accordance with
                        Section 607.5.5, Exception 2.
        kk. Slide 190: 504.8 # 3, # 5
                     ii. #3. Rigid metal ductwork shall be
                         installed within the shaft to
                         convey the exhaust.
                    iii.  The ductwork shall be
                         constructed of sheet steel having
                         a minimum thickness of 0.0187
                         inch (0.4712 mm) (No. 26 gage)
                         and in accordance with SMACNA
                         Duct Construction Standards.
                    iv.  The exhaust fan motor design
                         shall be in accordance with
                         Section 503.2.
                     v.  #6. 503.2 Fans. Parts of fans in
                         contact with explosive or
                         flammable vapors, fumes or
                         dusts shall be of nonferrous or
                         non-sparking materials, or their
                         casing shall be lined or
                         constructed of such material. . . .
                         Fans in systems-handling
                         materials that are capable of
                         clogging the blades, and fans in
                         buffing or woodworking exhaust
                         systems, shall be of the radial-
                         blade or tube-axial type.
                    vi.  Go back to the diagram and ask
                         for comments. Ask the class
                         about the cleanout at the bottom.
                         (It shall be a fire door since it is in
                         a fire rated shaft.)
                   vii.   There are fan manufacturers
                         who are selling pressure control
                         systems for this application and
                         providing instruction on this
                         application.


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                     viii.    All of the provisions of this code
                             may or may not be covered in
                             those instructions.
                      ix.     Whether they are or not, these
                             provisions shall be met.
                       x.     The pressure control system
                             goes above code and is not
                             required.
           ll. Slide 191: 505.2 Makeup Air Required
                        i. Read the code text and go to next
                            slide for explanation.
     mm.      Slide 192: 505.2 Makeup Air Required
                        i. Domestic kitchens are becoming
                           more like commercial kitchens,
                           both aesthetically and
                           functionally.
                       ii. Much higher capacity appliances
                           are being installed and much
                           higher capacity range hoods are
                           installed as a result.
                      iii. This can create an inadequate
                           amount of makeup air for all of
                           the exhaust from the dwelling.
                      iv.   Indoor negative pressures can
                           cause problems with the
                           operation of the appliances, the
                           heating and cooling system, and
                           if present, the fireplace.
                       v.  This section is designed to
                           mitigate some of those problems.
                      vi.  The means of closure is to
                           prevent excessive energy loss
                           when the unit is not operating.
                     vii.   When the homeowner is
                           operating the exhaust fan the
                           makeup air system must be
                           operating as well.
     nn.      Slide 193: 506.3.8 Grease Duct Cleanouts
                       i.  The requirement for doors
                           designed to be opened without a
                           tool has been removed.
                      ii.  Go to next slide.




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     oo.   Slide 194: 506.3.8 Grease Ducts cont’d
                     i. Discuss this one.
                    ii.  Ask if they have seen these
                        doors where the “wing nuts” will
                        not create a tight closure.
                   iii.  After a time, they are difficult to
                        tighten and the duct starts to
                        leak.
     pp.   Slide 195: Section 506.3.6 and 506.3.10
                    i.  The primary reason for this
                        change was to consolidate and
                        simplify the grease duct
                        clearance requirements with the
                        enclosure requirements.
                   ii.  This reorganization separates the
                        three options into three separate
                        sections.
     qq.   Slide 196: Section 506.3.6 and 506.3.10 cont’d
                    i.  506.3.6 now talks about grease
                        ducts only where enclosures are
                        not required and section 506.3.10
                        talks about clearances where
                        enclosures are required.
                   ii.  Read the text (mostly for review),
                        go to next slide.
     rr.   Slide 197: Section 506.3.6 Exceptions
                    i.  The exceptions are for materials
                        and equipment that, because of
                        their listing, already have an
                        established clearance to
                        combustibles in their installation
                        instructions.
                   ii.  304.1 is the section for listing,
                        labeling and manufacturer’s
                        instructions.
     ss.   Slide 198: Section 506.3.10 Re-written
                    i.  This section has been re-written.
     tt.   Slide 199: Section 506.3.10 Re-written
                    i.  This section has been re-written.
     uu.   Slide 200: Section 506.3.10 Re-written
                    i.  This section has been re-written.




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     vv.   Slide 203: Section 506.3.10 Re-written
                    i.  Now the new code language.
                   ii.  Read this slide and go to next
                        slide.
     ww.   Slide 204: Section 506 Exception
                    i.  Note that there are three
                        methods described in the next
                        three sections.
                   ii.  Read the slide and go to next
                        slide.
     xx.   Slide 205: Section 506.3.10.1 Shaft Enclosure
                     i. First: The Shaft Enclosure:
                    ii. This includes both horizontal and
                        vertical runs of duct.
                   iii. The enclosure must originate in
                        the room containing the hood and
                        must extend to where the duct
                        discharges to the outdoors.
     yy.   Slide 206: Section 506.3.10.2 Field –applied
                         Grease Duct Enclosure
                     i. Method 2: Field- applied
                        enclosure:
                    ii.  More commonly known as “fire
                        wrap”.
                   iii.  It must meet ASTM E 2336.
     yy.   Slide 207: Section 506.3.10.2 cont’d
                   i.   Read slide and go to next.
     zz.   Slide 208: Section 506.3.10.3 Factory-built
           Grease Duct Assemblies
                    i.  Method 3:
                        In order to comply with UL 2221
                        the enclosure must first pass the
                        tests for UL 1978, and then has
                        added insulation to comply with
                        UL2221.
                   ii.  Some of these systems have 0
                        clearance to combustibles.
                  iii.  These systems are often used
                        where clearance is a problem or
                        where “fire wrap” is likely to get
                        damaged.




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     aaa.   Slide 209: Section 506 Summary
                   i.    Summary, move to next slide.
     bbb.   Slide 210: Section 506 Summary cont’d
                   i.    There are several new
                         requirements for Type II kitchen
                         hood exhaust.
     ccc.   Slide 211.0: Section 506 Deletions
                   i.     This section has been
                          re-arranged and expanded.
     ddd.   Slide 212: Section 506.4.1 Ducts
                   i.    This portion of 506.4 has not
                         changed, it is just moved.
                  ii.    Read section and go to next
                         slide.
     eee.   Slide 213 : Section 506.4.2 Type11 Ducts
                   i.     These are the new requirements
                          for termination of exhaust outlets
                          serving Type II hoods.
                  ii.     Read slide and go to next one.
     fff.   Slide 214: Section 506.4.2 cont’d
                  i.     Read slide
                 ii.     Go to next slide for illustration.
     ggg.   Slide 215: Section 506.4.2 cont’d
                  i.     Go over the requirements in the
                         illustration and ask for questions.
                 ii.     Note the 10’ above grade.
                iii.     This coordinates with Section
                         501.2.1.1, requiring that exhaust
                         not be directed onto walkways.
                iv.      The 30” minimum to exterior
                         walls is to prevent damage to wall
                         from steam or heat.
     hhh.   Slide 216: Section 506.4.2 cont’d
                i.       Read and discuss if you want.
     iii.   Slide 217: Section 507
                 i.      Section 507 is on commercial
                         cooking appliances.
                ii.      Read and go to next slide.




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     jjj.   Slide 218: Section 507.2.1 Type 1 Hoods
                 i.      Read the new code text.
                ii.       Note the NC amendment.
               iii.      Note that there are no exceptions
                         for heavy-duty and extra-heavy-
                         duty cooking appliances.
     kkk.   Slide 219: Section 507.2.2 Type II Hoods
                 i.      Read text.
                ii.      Note that it states “except where
                         the heat and moisture loads from
                         such appliances are incorporated
                         into the HVAC system design or
                         into the design of a separate
                         removal system,”
               iii.      Move to next slide.
     lll.   Slide 220: Section 507.2.2 cont’d
                 i.      These exceptions have not
                         changed.
                ii.      Note that the new code text
                         covers exception 2.
               iii.      These exceptions were removed
                         from the IMC, but were included
                         by North Carolina Amendment.
     mmm. Slide 221: Section 507.2.2 cont’d
              i.       So, with the new code text, for a
                       medium-duty or light-duty
                       appliance that does not produce
                       grease or smoke, the Type II
                       hood is required unless the
                       appliance has its own exhaust
                       system or the HVAC system is
                       designed to handle the additional
                       load.
     nnn.   Slide 222: Section 507.2.2 cont’d
                 i.      This is a summary of how to
                         determine whether a hood is
                         required.
                ii.      For gas-fired appliances a
                         system must be in place to
                         handle the products of
                         combustion, whether it is a hood,
                         or a separate exhaust system.




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     ooo.   Slide 223: Section 507.2.3 Domestic cooking
            appliances used for commercial purposes.
                 i.      This section was changed by
                         North Carolina Amendment.
                ii.      The four-burner requirement is
                         gone.

     ppp.   Slide 224: Section 507.2.3 cont’d
                 i.      The middle burner on some of
                         these 5 burner ranges is for
                         warming and holding only and is
                         design to lower maximum
                         temperatures.
                ii.      We are seeing these being
                         installed in churches and day
                         care centers.
               iii.      The key is whether it is being
                         used for commercial purposes on
                         a regular basis.
               iv.       In other words if they are
                         preparing food to be sold to the
                         general public, a hood would be
                         required if required by Section
                         507.
                v.       Churches generally prepare food
                         only for their congregations.




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Notes Presenter slides 57 – 224:




End of Presenter slides 153 – 224:




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8. Discuss the significant changes to Duct Systems Chapter 6
   of the 2012 NC Mechanical Code.
             a. Slide 225: Section 601.2 Air movements
                     i.      The intent of this section remains
                             the same.
                    ii.       An exception was added for
                             clarity.
             b. Slide 226: Section 601.2 cont’d
                      i.     Ask if they remember what the
                             first 3 exceptions are. (dwelling
                             units, tenant spaces of 1000
                             square feet or less, and use of
                             corridor for makeup air for rooms
                             open directly onto the corridor)
                     ii.     It was never the intent of this
                             section to prevent the use of air
                             supplied to the corridor to be
                             used as makeup air. This is a
                             clarification.
                    iii.     It is not the intent of this section
                             to prevent a corridor from being
                             conditioned.
                   iv.       Supply and return air is allowed
                             in the corridor, the corridor cannot
                             be used as a supply or return
                             duct.
                     v.      Plan reviewers may often see air
                             supplied to a long corridor with
                             only a return grille at the end of
                             the corridor.
                   vi.        This arrangement uses the
                             corridor for return air duct.
                   vii.       If return grilles are placed in
                             several locations in the corridor,
                             then in a fire scenario, smoke will
                             not likely travel all the way down
                             the corridor.
             c. Slide 227: Section 601.4 Contamination
                             Prevention
                     i.      Read this slide, excluding the
                             deleted code text.
                    ii.       The exhaust system for
                             environmental air would fall into
                             this category.


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        d. Slide 228: Section 601.4 Contamination
                        Prevention cont’d
                i.      A “vent” in the Mechanical Code
                        is a conduit for conveying
                        combustion air.
               ii.       The use of the word vent is not
                        intended for plumbing vents.
        e. Slide 229: Section 601.4 Contamination
                        Prevention
               i.       Read slide and go to next slide
                        for comment.
        f. Slide 230: Section 602.2.1 Materials within
                        plenums
                i.      This section covers materials
                        within plenums, not the plenum
                        construction itself.
               ii.       This requirement is regardless of
                        whether the plenum is
                        constructed of combustible
                        materials.
              iii.       Section 602.2 covers the
                        construction of the plenum
                        enclosure.
              iv.       The code permits limited types of
                        combustible materials for
                        mechanical, electrical, fire
                        protection, communication and
                        plumbing systems.
        g. Slide 231: Section 602.2.1 Exceptions
                i.      Sections 603 and 604 cover the
                        burn and smoke ratings for ducts,
                        connectors, sealants, and
                        coverings.
               ii.      The code exempts one and two
                        family dwellings.
              iii.       A dwelling is a building that
                        contains not more than two
                        dwelling units.
              iv.       If a building has more than two
                        attached dwelling units, materials
                        in plenums must comply with this
                        section, except for within the
                        dwelling units as described in
                        exception 6.


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        h. Slide 232: Section 602.2.1 Exceptions cont’d
                i.      The North Carolina Amendment
                        allows materials in furnace rooms
                        and air handler rooms to be
                        combustible as long the room is
                        inside a dwelling unit.
               ii.      Explain the difference between
                        plenums inside apartment units
                        and plenums in other areas of an
                        apartment building.
        i.   Slide 233: Section 602.2.1.4 Deletions
                 i.       This section has been re-written,
                          with two subsections.
        j.   Slide 234: Section 602 Summary
                  i.      Read the code text.
                 ii.      This section now allows electrical
                          equipment in metal enclosures to
                          be located in a plenum because
                          they are non-combustible.
                iii.      Equipment that has combustible
                          enclosures must meet the
                          requirements of UL 2043.
        k. Slide 235: Section 603.4.1 Minimum fasteners
                i.      Screws that are placed in close
                        proximity to each other are not
                        acceptable.
               ii.       Even where the duct is against a
                        wall or ceiling so that the screws
                        cannot be placed equidistant
                        around the duct, they must be
                        placed so that the connection will
                        not flex, sag, or move like a
                        hinged joint.
        l.   Slide 236: Section 603.4.1 cont’d
                  i.      An example of 3 screws placed
                          equidistant apart.
                 ii.       Go to next slide
        m. Slide 237: Section 603.4.1 cont’d
                i.      Read or paraphrase this
                        information.
               ii.      Ask, what if it is a 12” duct?
              iii.      What if it is a 5” duct?
              iv.        Answer: 3 screws.


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        n. Slide 238: Section 603.7 Rigid duct
                        penetrations
               i.       This portion of section 603.7 has
                        not changed.
        o. Slide 239: Section 603.7 cont’d
                i.      North Carolina Ad Hoc
                         Committee added “or other
                         approved material”.
               ii.      UL testing found that duct board
                         could withstand fire tests as long
                         as 26 gauge duct could.
              iii.       This only applies to a private
                         garage.
              iv.       The duct shall be galvanized
                         sheet metal or other approved
                         material as it goes through the
                         wall.
               v.        It should not transition to flex
                         duct until after it passes through
                         the wall separating the dwelling
                         unit from the garage.
        p. Slide 240: Section 603.7 cont’d
               i.       This section does not prohibit
                        duct openings in the garage if the
                        system serves only the garage
                        and does not pass through any
                        walls, floors or ceiling of the
                        garage that connect to the
                        dwelling unit.
        q. Slide 241: Section 603.18 Return-air intake
                i.      The ad hoc committee decided
                        that this section fit better in
                        Chapter 6, duct systems than it
                        did in Chapter 9 for specific
                        appliances.
               ii.      Section 603.18 is for location,
                        number and size of return air
                        intakes and was moved
                        unchanged.




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        r. Slide 242: Section 603.19 Under floor plenums
                i.      This is a carryover from previous
                        codes.
               ii.      The Committee decided it was
                        important to keep this in the
                        codes for maintenance and repair
                        of this type of system.
        s. Slide 243: Section 603.19.2 Materials
               i.       Read text and move to next slide.
        t. Slide 244: Section 603.19.3 Furnace
                        connections
               i.       Read text and move to next slide.
        u. Slide 245: Section 603.19.3 Furnace
                        connections cont’d
               i.       Read text and move to next slide.
        v. Slide 246: Section 603.19.4 Access
               i.       Read text and move to next slide.
        w. Slide 247: Section 603.19.5 Furnace controls
               i.       Read text and move to next slide.
        x. Slide 248: Section 603.19 Discussion
                i.      This illustration is from an old
                        residential code (CABO).
               ii.      Note that the beginning sentence
                        of this section prohibits under
                        floor plenums in new
                        construction.
        y. Slide 249: Section 603.19 Discussion cont’d
               i.       A heat pump is a furnace.
        z. Slide 250: Section 603 Discussion
                 i.  When this part of the code is applied
                     for existing construction only, if the
                     plenum is being repaired and
                     existing plumbing cleanouts are
                     present, they do not have to be
                     removed.
                ii.   New plumbing cleanouts would not
                     be allowed to be installed in an
                     existing under-floor plenum.




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        aa. Slide 251: 604.3 Coverings and Linings
                   i. This section covers the linings and
                      covering material for duct insulation.
                  ii. UL 723 and ASTM E 84 are virtually
                      identical.
                 iii.  The UL standard was added for
                      clarity.
        bb. Slide 252: 604.7 Identification
                  i.  Spray foam insulation for ductwork is
                      an acceptable means for insulating
                      ductwork and provides additional
                      sealing of the duct.
                 ii.  Note that spf over ductwork in an
                      attic or crawlspace must be covered
                      with a thermal or ignition barrier
                      depending on the accessibility and
                      intended use of the attic or
                      crawlspace.
        cc. Slide 253: 604.7 Identification (Clarification )
                   i. Richard S. Duncan, Ph.D., P.E.
                      Technical Director of the Spray
                      Polyurethane Foam Alliance in
                      Fairfax, Virginia says this about aged
                      R-value.
                  ii. “Age R-value is the R-value
                      measured for a fixed aging period
                      and temperature condition after the
                      product is sprayed.
                 iii. The accepted conditions for R-value
                      aging are 180 days at 73F or 90
                      days at 140F.
                 iv.  This aging is needed because
                      insulating blowing agents in the cells
                      near the surface of the foam will off-
                      gas and slightly lower the thermal
                      performance to a terminal value over
                      this period.
                  v.   Aged R-value for foam plastics are
                      required by the FTC for residential
                      insulations, and should be the only
                      R-values reported by the supplier or
                      manufacturer.




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                vi.   Any foam possessing a valid ICC ES
                      Report or ESR will report the aged
                      R-value.”
        dd. Slide 254: 606.4.1 Supervision
                  i.  The 2009 code text gave the
                      impression that a fire alarm system
                      was required.
                 ii.   The change is to clarify this section.
                      Go to next slide for comment.
        ee. Slide 255: 606.4.1 Supervision cont’d
                  i.  Discuss and go to next slide.
        ff. Slide 256: Section 607 Discussion
                  i.  Read slide and go to next slide.
        gg. Slide 257: Section 607.5 Where required
                  i.  A ceiling radiation damper has a
                      different testing method from fire and
                      smoke dampers.
                 ii.   The ICC does not consider a
                      radiation damper to be a fire damper.
        hh. Slide 258: Section 607 Discussion
                  i.  Read and move to next slide.
        ii. Slide 259: Section 607.5.5 Shaft enclosures
                  i.  Fire and smoke dampers are
                      prohibited in kitchen exhaust
                      systems and in dryer exhaust
                      systems.
        jj. Slide 260: 607.5.5 Shaft enclosures cont’d
                  i.  Read or paraphrase and move to
                      next slide.
        kk. Slide 261: 607.5.5.1 Enclosure at the bottom
                  i.  Read and go to next slide.
        ll. Slide 262: Chapter 6 Discussion
                   i. Read and comment.
                  ii.  One comment might be, “If the
                      lowest floor is one hour rated, and
                      the shaft is two hour rated, what is
                      the required rating at the bottom of
                      the shaft?
                 iii.  Two hours.”




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        kk. Slide 263: Chapter 6 Discussion cont’d
                  i.  This is an illustration of the shaft
                      enclosed at the bottom.
                 ii.  The yellow and green at the shaft
                      penetrations are fire and smoke
                      dampers.
        ll. Slide 264: Chapter 6 Discussion cont’d
                 i.   Read this and move to next slide.
       mm. Slide 265: Chapter 6 Discussion cont’d
                i.   This is a mechanical room for the air
                     handling unit.
               ii.   Since the shaft is providing routing
                     for the duct system from the air
                     handler, its use is related to the use
                     of the room.
              iii.   Note that the room shall be enclosed
                     with fire rating equal to the shaft.
              iv.    The adjoining room could be any
                     room and is shown here as rated on
                     all sides.
               v.    Only the room adjoining the shaft
                     needs to be rated.
       nn. Slide 266: Chapter 6 Discussion cont’d
              i.   Read this slide and go to next slide for
                   comment.
       oo. Slide 267: Chapter 6 Discussion cont’d
              i.   This is an example of the third method.
                   The requirement for a smoke damper
                   in Section 716.5.3 must also be met
                   unless it meets one of the exemptions.
       pp. Slide 268: Section 607.5.6 Exterior Walls
              i.   NCBC Section 705.10 requires that
                   penetrations in fire rated exterior walls
                   be protected.
             ii.    Table 705.8 of the NCBC gives the
                   maximum allowable area of openings
                   based on fire separation distance.
            iii.   Note that exhaust outlets that cannot
                   have fire dampers, such as kitchen
                   exhaust and dryer vents cannot be
                   located in walls that are required to be
                   protected.



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       qq. Slide 269: 607.5.6 Exterior Walls cont’d
               i.    Read or paraphrase.
        rr. Slide 270: 607.5.6 Exterior Walls cont’d
                i.    In other words, if a duct or vent that
                      is prohibited from having fire
                      dampers installed in an exterior wall,
                      it must be in a non-rated wall.
        ss. Slide 271: 607.5.6 Exterior Walls cont’d
                i.    Read and move on.
        tt. Slide 272: 607.5.7 Smoke partitions
                i.    Read slide and go on to next.
        uu. Slide 273: 607.5.7 Smoke partitions cont’d
                 i.   Illustration of smoke partition with air
                      transfer opening.
                ii.    The smoke damper is required in an
                      air transfer opening, but a duct
                      penetration is required to be installed
                      “to resist the passage of smoke”.
        vv. Slide 274: Section 607 Discussions
                i.    This is also covered in the North
                      Carolina Building Code.




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Notes Presenter slides 225 - 274:




End of Presenter slides 224 - 274:




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9.   Discuss the significant changes to Combustion Air Chapter
     7 of the 2012 NC Mechanical Code.
              a. Slide 275: Chapter 7 Combustion Air
                        i.  Read this introduction and go to next
                            slide.
              b. Slide 276: Section 701.1 Scope
                        i.  Read the text and go to next slide for
                            explanation of the change.
              c. Slide 277: Chapter 7 Discussion
                         i. Natural gas appliances have different
                            operating characteristics from solid
                            and liquid fuel burning appliances.
                            Combustion air requirements should
                            be specific to the fuel type.
                        ii. For Fuel Gas appliances, the
                            requirements are found in the Fuel
                            Gas Code.
                       iii. For oil burning equipment, the
                            requirements are found in NFPA 31.
                       iv.  For solid fuel burning appliances, the
                            requirements are found in the
                            appliance manufacturer’s installation
                            instructions.
     Notes Presenter slides 275 - 277:




     End of Presenter slides 275 - 277:


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10. Discuss the significant changes to Chimneys and Vents
    Chapter 8 of the 2012 NC Mechanical Code.
             a. Slide 278: Chapter 8 Chimneys & Vents
                           Section 801.18.4 Clearances
                     i.    Read slide and go to next one.
             d. Slide 279: Chapter 8 Chimneys & Vents
                           Section 801.18.4 Clearances
                     i.    The Exception is changed.
             e. Slide 280: Chapter 8 Chimneys & Vents
                           Section 801.18.4 Clearances
                      i.   Read code text.
                     ii.    The exception now makes it clear
                           that the clearances are based on the
                           chimney liner listing and
                           manufacturer’s instructions.
                    iii.   Previously it was implied that no
                           clearance was required.
                    iv.     Some of these systems require
                           clearances and some have no
                           required clearance to combustibles.
             f. Slide 281: Section 801 Discussion
                           Section 801.18.4 Clearances
                     i.    Read or paraphrase.
             g. Slide 282: Section 801.18.4.1 Fireblocking
                    i.    This was in moved to its own section
                          so that 801.18.4 deals with
                          clearances, and 801.14.1 deals with
                          fireblocking.
             h. Slide 283: 801.20 Plastic Vent Joints
                       i. Note that the solvent cement joints
                           requirement is deleted.
             i. Slide 284: Section 801 Discussion
                       i. Go over this slide by paraphrasing.




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      Notes Presenter slides 278 - 284:




      End of Presenter slides 278 - 284:


11.   Discuss the significant changes to Specific Appliances,
      Fireplaces, Solid Fuel-Burning Equipment Chapter 9 of the
      2012 NC Mechanical Code.
              a. Slide 285: Chapter 9 Specific Appliances,
                               Fireplaces, and Solid Fuel-
                               Burning Equipment Section
                               918.6 Prohibited Sources
                         i. Read this code text.
                        ii. Go to next slide.
              b. Slide 286: Chapter 9
                     Section 918.6 Prohibited Sources
                          i. Read this code text and explain that
                             this if for where kitchens are open to
                             other areas.
                         ii. It is difficult to determine where the
                             kitchen ends and the adjoining area
                             starts.
                        iii. The intent is to keep kitchen odors
                             and vapors from getting into the
                             HVAC system and to prevent the
                             disruption of the hood performance.

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        c. Slide 287: 918.6 Prohibited Sources cont’d.
               i. Taking return air from conditioned crawl
                   spaces is acceptable.
        d. Slide 288: 918.6 Prohibited Sources cont’d.
              i.   This would also apply to a fireplace
                   insert or fireplace stove.
        e. Slide 289: 918.6 Prohibited Sources cont’d.
               i.  Read or paraphrase these comments.
              ii.  Go to next slide.
        f. Slide 290: 918.6 Prohibited Sources cont’d
               i.  This section only addresses outdoor
                   (ventilation) or return air for a forced-air
                   heating system.
              ii.   The change in 7.4 was for clarification.
             iii.  The wording in the 2009 NCMC was
                   confusing.
        g. Slide 291: Section 927 Heat Recovery
                          Ventilators
              i.   Heat recovery units are becoming more
                   popular, even in residential construction,
                   so they were added to the code.

        h. Slide 292: Section 927 Heat Recovery
                           Ventilators cont’d
              i.   Heat recovery units are now included as
                   listed and labeled appliances.




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      Notes Presenter slides 285 - 292:




      End of Presenter slides 285 - 292:
12.   Discuss the significant changes to Hydronic Piping
      Chapter 10 of the 2012 NC Mechanical Code.
                i. Slide 293: Chapter 10 Boilers,Water Heaters
                                 and Pressure Vessels
                          i.  Simply state that this Chapter will not
                              have changes in the 2012 code.

13.   Discuss the significant changes to Refrigeration Chapter 11
      of the 2012 NC Mechanical Code.
               a. Slide 294: Chapter 11 Refrigeration
                         i.  There is continuing research on
                             refrigerants and new refrigerants will
                             mostly likely be added for some time.
               b. Slide 295: Chapter 11 Refrigeration cont’d
                         i.  This chapter is now more consistent
                             with the ASHRAE Standard.




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        c. Slide 296: Chapter 11 Refrigeration cont’d
                  i.  Read or paraphrase and continue to
                      next slide.

        d. Slide 297: 1104.2.2 Industrial occupancies and
                      refrigerated rooms
                  i.  Read code text and to next slide for
                      change.
        e. Slide 298: 1104.2.2 Industrial occupancies and
                      refrigerated rooms cont’d.
                  i.  The potential fire risk for anhydrous
                      ammonia (R717) is very small in a
                      code compliant machinery room.
                 ii.  This change coordinates with
                      ASHRAE Standard 15, Safety
                      Standard for Refrigeration Systems.

        f. Slide 299: 1107.2 Pipe enclosures
                 i.   You will continue to see changes in
                      the code that will align with the
                      ASHRAE Standards.

        g. Slide300: 1107.2 Pipe enclosures
                i.   This has been re-written.

        h. Slide 301: 1107.2 Piping location
                 i.  New text: Read text.
                ii.   Note that refrigerant piping is not
                     allowed in an enclosed public
                     stairway.
        i.   Slide 302: 1107.2 Piping in concrete floors
                    i. This is exactly as it is written in
                       ASHRAE 15 standard.
                   ii.  It does not address the pipe duct
                       material.
                  iii. PVC pipe ducts would be
                       acceptable.




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Notes Presenter slides 293 - 3021:




End of Presenter slides 293 - 302:




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  13. Discuss the significant changes to Hydronic Piping
      Chapter 12 of the 2012 NC State Mechanical Code.
         a. Slide 303: Chapter 12 Hydronic Piping
                    i. New materials are introduced that
                       have been used in other countries
                       without problems and that have meet
                       the appropriate standards.
        b. Slide 304: Section 1201.2 Sizing
                    i. Why is this important?
                   ii. In hydronic systems, some
                       components, like regulators, may
                       require a different pipe diameter than
                       the connecting piping in order to
                       meet the demand of the system.
                  iii. It is not to be assumed that
                       components can simply be the same
                       size as the piping.
                 iv. Undersized piping can be subjected
                       to greater stress and erosion.
                   v. Noise can become a problem due to
                       increased velocity.
                 vi. Incorrect sizing can cause loss of
                       system capacity, inefficient
                       operation, and unsafe operation of
                       the equipment.
        c. Slide 305: Section 1201.3 Standards
                 i.  ASME B31.9 is a recognized
                     international standard for hydronic
                     piping.
                ii.  This standard is intended to be
                     applied to piping for water and anti-
                     freeze solutions for heating and
                     cooling, steam, steam condensate,
                     air liquefied in limited sizes,
                     pressures, and temperature limits.
                iii.   ASME B31.9 was developed in 1982
                       for commercial and multi-family
                       building systems. It is considered a
                       reliable method and is an acceptable
                       alternative for determining materials
                       for piping, joints, connections, and
                       other system components.




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        d. Slide 306: Table 1204.2 Hydronic Pipe
                 i.  Four piping materials have been
                     added to the Table of accepted
                     materials for hydronic pipe.
        e. Slide 307: Section 1202 Discussion
                 i.  PE-RT is manufactured to
                     ASTM F 2623.
        f. Slide 308: Section 1202 Discussion cont’d.
                 i.  PE-AL-PE, not to be confused with
                     Pex-Al-Pex, must meet ASTM F
                     1282.
                ii.   The polyethylene does not have the
                     cross-linked molecular structure of
                     PEX.
        g. Slide 309: Section 1202 Discussion cont’d.
                  i. Ductile iron has been used for
                     hydronic systems in a number of
                     locations without problems and both
                     of these have been allowed in the
                     plumbing code.
                 ii.  They are now accepted for hydronic
                     systems.
                iii. Some international corporations
                     requested this change.

        h. Slide 310: Section 1202 Discussion cont’d.
                 i.  Paraphrase this information.
                ii.   This piping comes in purple, green,
                     and blue.
        i.   Slide 311: 1203.8.2 Push-fit joints
                   i.  Section 1203 describes the joint and
                       connection requirements for piping
                       systems.
        j.   Slide 312: Section 1203 Discussion
                   i.  Read and continue.
        k. Slide 313: 1203.15.1 Heat fusion joints
                 i.  Read and continue.




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        l.   Slide 315: 1203.16 Polypropylene (PP) plastic
                    i. Read and continue.
                   ii.  This starts the new sections for the
                       new materials.
                  iii. If you can find some samples of
                       these new piping systems to pass
                       around the classroom, it would add
                       interest.
        m. Slide 316: 1203.16.1 Heat-fusion joints
                 i.  Read and continue.
        n. Slide 318: 1203.17 Raised temperature
                          polyethylene (PE-RT) plastic
                          tubing
                  i. Read and continue.
                 ii.  A little humor here would help.
                iii. This is dry material.
        o. Slide 319: 1203.17.1 Compression-type fitting
                     tubing
                 i.  Read and continue.
        p. Slide 320: 1203.17.2 PE-RT-to-Metal
                        connections
                 i.  Read and continue
        q. Slide 322: 1203.18.1Compression-type fittings
                 i.  Read and continue
        r. Slide 324: 1203.19 Cross-linked
                        Polyethylene/aluminum/cross-
                        linked polyethylene
                        (PEX-AL-PEX) pressure pipe
                 i.  Read and continue
        s. Slide 327: 1203.18.1Compression-type fittings
                 i.  This begins coverage on changes in
                     requirements for radiant heating
                     systems.
                ii.   Discuss why these systems are
                     becoming more popular. These
                     systems have been popular in
                     Northern Climates for years.




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        t. Slide 328: 1209.5.1 Slab on grade installation
                  i. Insulation is now required below the
                     piping in radiant floor systems.
                 ii.  This improves the effectiveness and
                     efficiency of the system and save
                     energy.
                iii.  There requirements for two
                     arrangements.
                iv.  First, slab on grade.
                 v.  Read text. Without the insulation,
                     the ground would absorb a great
                     deal of heat before it comes into
                     equilibrium and allows the heat to
                     rise into the space intended to be
                     heated.
        u. Slide 329: 1209.5.2 Suspended floor insulation
                  i. Second, suspended floor
                     installations.
                 ii. Read text. The insulation directs the
                     heat where it is intended instead of
                     the space below.
                iii. The insulation must be installed in
                     accordance with the insulation
                     manufacturer’s instructions.
                iv.  The instructions should include the
                     requirement for an air barrier
                     between the insulation and the
                     space below unless the insulation
                     has its own air barrier applied to it.
        v. Slide 330: 1209.5.3 A thermal break required
                 i.  A thermal break is required to
                     prevent heat loss to the foundation.
        w. Slide 331: 1209.5.4 Thermal barrier marking
                 i.  Just as in the Energy Code, the
                     insulating materials shall bear an
                     R-value mark.
                ii.  These provisions were not covered
                     in the Energy Code, so it is
                     appropriate to include them in the
                     Mechanical Code for this type of
                     system.




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         x. Slide 332: Questions ?
                  i.  As in any good class, ask if there are
                         any questions.
         y. Slide 333: That’s all, folks!
                  i.  For CE approved classes, remind
                         the class to fill out the evaluation
                         form and pick up their certificates.
                 ii.   You may provide your contact
                         information as well as the DOI
                         contact information for additional
                         questions.
Notes Presenter slides 302 – 333:




End of Presenter Notes slides 302 – 333:



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Extended Presenter Notes slides _______




End of Extended Presenter notes slides ______




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