ABSORPTION UNIT is an absorption supply air to a common space or are drawing air
refrigeration system which has been factory- from a common plenum or space.
assembled and tested prior to its installation.
AIR, OUTSIDE is air from outside the building
ACCA is the Air Conditioning Contractors of intentionally conveyed by openings or ducts to
America. rooms or to conditioning equipment.
ACCA MANUAL J is the Air Conditioning AIR POROSITY is a measure of the air-
Contractors of America document entitled tightness of infiltration barriers in units
“Manual J - Residential Load Calculation, Eighth of cubic feet per hour per square foot per inch of
Edition” (2003). mercury pressure difference.
ACM Joint Appendix I - Glossary
ADDITION is any change to a building that 2005 Joint Appendices Page I-2
increases conditioned floor area and conditioned
volume. Addition is also any change that AIR, RETURN is air from the conditioned area
increases the floor area or volume of an
that is returned to the conditioning equipment for
unconditioned building of an occupancy group or
type regulated by Part 6. Addition is also any
change that increases the illuminated area of an
outdoor lighting application regulated by Part 6. AIR, SUPPLY is air being conveyed to a
See Newly Conditioned Space conditioned area through ducts or plenums from
a heat exchanger of a heating, cooling,
AFUE See Annual Fuel Utilization Efficiency absorption or evaporative cooling system.
AGRICULTURAL BUILDING is a structure A I R B R E A K – A physical separation which
designed and constructed to house farm may be a low inlet into the indirect waste
implements, hay, grain, poultry, livestock or receptor from the fixture, appliance, or device
other horticultural products. It is not a structure indirectly connected.
that is a place of human habitation, a place of
employment where agricultural products AIR CHAMBER – A pressure surge-absorbing
are processed, treated or packaged, or a place device operating through the compressibility of
used by the public. air.
AIR, COMBUSTION. See COMBUSTION AIR. AIRGAP, DRAINAGE – The unobstructed
vertical distance through the free atmosphere
between the lowest opening from any pipe,
AIR, CONDITIONED is air which has been
plumbing fixture, appliance or appurtenance
treated to achieve a desired level of
conveying waste to the flood level rim of the
temperature, humidity or cleanliness.
AIR, EXHAUST is air being removed from any AIRGAP, WATER DISTRIBUTION – The
space or piece of equipment and conveyed unobstructed vertical distance through the free
directly to the atmosphere by means of openings atmosphere between the lowest opening from
or ducts. any pipe or faucet conveying potable water to
the flood level rim of any tank, vat or fixture.
AIR-HANDLING UNIT is a blower or fan used
for the purpose of distributing supply air to a AIRFLOW ACROSS THE EVAPORATOR is the
room, space or area. rate of airflow, usually measured in cfm across a
heating or cooling coil. The efficiency of air
AIR, MAKEUP is air which is provided to conditioners and heat pumps is affected by the
replace air being exhausted. airflow across the evaporator (or condenser in
the case of a heat pump).
AIR-MOVING SYSTEM is a system designed to See Thermostatic Expansion Valves (TXV).
provide heating, cooling or ventilation in which
AIR-TO-AIR HEAT EXCHANGER is a device
one or more air-handling units are used to
which will reduce the heat losses or gains which
occur when a building is mechanically ventilated, APPLIANCE STANDARDS are the Standards
by transferring heat between the conditioned air contained in the Appliance Efficiency
being exhausted and the unconditioned air being Regulations.
AREA DRAIN – A receptor designed to collect
ALTERATION is any change to a building's surface or storm water from an open area.
water heating system, space conditioning
system, lighting system, or building envelope AREAL HEAT CAPACITY See Heat Capacity.
that is not an addition.
ARI is the Air-Conditioning and Refrigeration
ALTERNATIVE CALCULATION METHOD Institute.
APPROVAL MANUAL OR ACM MANUAL
is the Alternative Calculation Method (ACM) ASHRAE is the American Society of Heating,
Approval Manual for the 2001 Energy Efficiency Refrigerating and Air-Conditioning Engineers.
Standards for Nonresidential Buildings, (P400-
01-011) for nonresidential buildings, hotels, ASPIRATOR – A fitting or device supplied with
and multi-family residential buildings with four or water or other fluid under positive pressure
more stories and the Alternative Calculation which passes through an integral orifice or
Method (ACM) Approval Manual for the 2001 constriction, causing a vacuum.
Energy Efficiency Standards for Residential
Buildings, (P400-01-012) for all single family and ASSEMBLY BUILDING [Not adopted by HCD]
low-rise multi-family residential buildings. is a building or a portion of a building used, [For
SFM] or intended to be used for the gathering
ALTERNATIVE CALCULATION METHODS together of fifty (50) or more persons for such
(ACMS) are the Commission's Public Domain purposes as deliberation, education, instruction,
Computer Programs, one of the Commission's worship, entertainment, amusement, drinking,
Simplified Calculation Methods, or any dining or awaiting transportation. [for SFM] or
other calculation method approved by the education; or structure or portion thereof used or
Commission. intended to be used for the showing of motion
pictures when an admission fee is charged and
ALTERNATIVE COMPONENT PACKAGE is when such building or structure is open to the
one of the sets of low-rise residential public and has a capacity of 10 or more persons.
prescriptive requirements contained in § 151(f).
Each package is a set of measures that achieve ASTM is the American Society for Testing and
a level of performance, which meets the
standards. These are often referred to as the
prescriptive packages or packages. "Buildings ATRIUM is a large-volume space created by
that comply with the prescriptive standards shall openings connecting two or more stories and is
be designed, constructed and equipped to meet
used for purposes other than an enclosed
all of the requirements of one of the alternative
stairway, an elevator hoistway, an escalator
packages of components shown in Tables 151-B
opening, or as a utility shaft for plumbing,
and 151-C for the appropriate climate zone..."
electrical, air-conditioning or other equipment,
and is not a mall.
ANNUAL FUEL UTILIZATION EFFICIENCY
(AFUE) is a measure of the percentage of heat
ATTIC is an enclosed unconditioned space
from the combustion of gas or oil which is
directly below the roof and above the ceiling.
transferred to the space being heated during
a year, as determined using the applicable test AUDITORIUM: See Occupancy Type.
method in the Appliance Efficiency Regulations
or Section 112. AUTO REPAIR: See Occupancy Type.
APPLIANCE EFFICIENCY REGULATIONS are
AUTOMATIC MULTI-LEVEL DAYLIGHTING
the regulations in Title 20, Section 1601 et seq. CONTROL is a multi-level lighting control that
of the California Code of Regulations. automatically reduces lighting in multiple steps
or continuous dimming in response to available
daylight. This control uses one or more BOILER, HIGH PRESSURE is a boiler
photocontrols to detect changes in daylight furnishing steam at pressures in excess of
illumination and then change the electric lighting fifteen (15) pounds per square inch (103.4 kPa)
level in response to the daylight changes. or hot water at temperatures in excess of 250°F
(121°C) or at pressures in excess of 160 pounds
AUTOMATIC TIME SWITCH CONTROL per square inch (1102.4 kPa).
DEVICES are devices capable of automatically
turning loads off and on based on time BOILER ROOM is any room containing a steam
schedules. or hot water boiler.
AZEOTROPE is a refrigerant blend comprising BREECHING is a metal connector for medium-
multiple components of different volatiles that, and high-heat appliances.
when used in refrigeration cycles, do not change
volumetric composition or saturation BRINE is any liquid used for the transmission of
temperature as they evaporate or condense at
heat without a change in its state, having no
flash point or a flash point above 150°F (66°C),
as determined by the requirements of the Fire
B A C K F L O W – The flow of water or other Code. (See U.F.C. Standard 2-2 in Appendix A.)
liquids, mixtures, or substances into the
distributing pipes of a potable supply of water BTU/H is the listed maximum capacity of any
from any sources other than its intended source.
appliance, absorption unit or burner expressed
See Back-Siphonage, Back-Pressure Backflow.
in British thermal units input per hour, unless
BACKFLOW CONNECTION – Any
arrangement whereby backflow can occur.
BUILDING CODE [Not adopted by HCD 1 & 2]
BACK-PRESSURE BACKFLOW – Backflow is the building code, which is adopted by this
due to an increased pressure above the supply jurisdiction. [For DSASS, OSHPD 1, 2, 3 & 4,
pressure, which may be due to pumps, boilers, SFM] For purpose of the California Mechanical
gravity or other sources of pressure. Code, “Building Code” shall be the most recent
edition of the California Building Code.
BACKFLOW PREVENTER – A device or Exception: [For HCD 1 & 2] Whenever the term
means to prevent backflow into the potable “Building Code” is used in this code, it shall
water system. mean the California Building Code, Title 24, Part
BACK-SIPHONAGE – The flowing back of
used, contaminated, or polluted water from a BUILDING DRAIN – That part of the lowest
plumbing fixture or vessel into a water supply piping of a drainage system which receives the
pipe due to a pressure less than atmospheric in discharge from soil, waste, and other drainage
such pipe. See Backflow. pipes inside the walls of the building and
conveys it to the building sewer beginning two
BACKWATER VALVE – A device installed in a (2) feet (610 mm) outside the building wall.
drainage system to prevent reverse flow.
BUILDING DRAIN (Sanitary) – A building drain
BATHROOM – A room equipped with a shower which conveys sewage only.
BUILDING DRAIN (St o r m ) – A building drain
BATTERY OF FIXTURES – Any group of two which conveys storm water or other drainage,
(2) or more similar, adjacent fixtures which but no sewage
discharge into a common horizontal waste or
soil branch. BUILDING ENERGYEFFICIENCY
STANDARDS are the California Building Energy
BOILER BLOWOFF – An outlet on a boiler to Efficiency Standards as set forth in the California
permit emptying or discharge of sediment. Code of Regulations, Title 24, Part 6.
Also known as the California Energy Code.
BUILDING ENVELOPE is the ensemble of CERTIFICATE OF COMPLIANCE (CF-1R) is a
exterior and demising partitions of a building document with information required by the
that enclose conditioned space. Commission that is prepared by the
Documentation Author that indicates
BUILDING FACADE See Outdoor Lighting whether the building includes measures that
require field verification and diagnostic testing.
CALIFORNIA ENERGY CODE See Building
Energy Efficiency Standards CERTIFICATE OF FIELD VERIFICATION
AND DIAGNOSTIC TESTING (CF-4R)
BUILDING SEWER – That part of the horizontal is a document with information required by the
piping of a drainage system which extends from Commission that is prepared by the HERS Rater
the end of the building drain and which receives to certify that measures requiring field
the discharge of the building drain and conveys verification and diagnostic testing comply with
it to a public sewer, private sewer, private the requirements.
sewage disposal system, or other point of
disposal. CHIMNEY is a vertical shaft enclosing one or
more flues for conveying flue gases to the
BUILDING SEWER (Combined) – A building outside atmosphere.
sewer which conveys both sewage and storm
water or other drainage. FACTORY-BUILT CHIMNEY is a listed
BUILDING SEWER (Sanitary) – A building
sewer which conveys sewage only.
MASONRY CHIMNEY is a chimney of solid
BUILDING SEWER (Storm) – A building sewer masonry units, bricks, stones, listed masonry
which conveys storm water or other drainage, units or reinforced concrete, lined with suitable
but no sewage. flue liners.
BUILDING SUBDRAIN – That portion of a METAL CHIMNEY is a chimney constructed of
drainage system which does not drain by gravity metal with a minimum thickness not less than
into the building sewer. 0.127 inch (3.23 mm) (No. 10 manufacturer’s
standard gage) steel sheet.
BUILDING SUPPLY – The pipe carrying potable
water from the water meter or other source of CHIMNEY CLASSIFICATIONS:
water supply to a building or other point of use
or distribution on the lot. Building supply shall CHIMNEY, RESIDENTIAL APPLIANCE-TYPE
also mean water service. is a factory-built or masonry chimney suitable for
removing products of combustion from
CALIFORNIA BUILDING CODE [For DSA/SS] residential-type appliances producing
– The most recent edition of Title 24, Part 2, combustion gases not in excess of 1000°F
California Code of Regulations. (538°C), measured at the appliance flue outlet.
Factory-built Type HT chimneys have high-
CAPTIVE-KEY OVERRIDE is a type of lighting temperature thermal shock resistance.
control in which the key that activates the
override cannot be released when the lights are
CHIMNEY, LOW-HEAT APPLIANCE-TYPE is a
in the on position.
factory-built, masonry or metal chimney suitable
for removing the products of combustion from
CENTER OF GLASS U-FACTOR: is the U-
fuel-burning low-h e a t appliances producing
factor for the glass portion only of vertical or
combustion gases not in excess of 1000°F
horizontal fenestration and is measured at least
(538°C) under normal operating conditions, but
two and one half inches from the frame. Center
capable of producing combustion gases of
of glass U-factor does not consider the
1,400°F (760°C) during intermittent forced firing
U-factor of the frame. Center of glass U-factor is
for periods up to one hour. All temperatures are
measured at the appliance flue outlet.
CHIMNEY, MEDIUM-HEAT APPLIANCE-TYPE ACM Joint Appendix I – Glossary 2005 Joint
is a factory-built, masonry or metal chimney Appendices Page I-9
suitable for removing the products of combustion
from fuel-burning medium-heat appliances COEFFICIENT OF PERFORMANCE (COP),
producing combustion gases not in excess of COOLING, is the ratio of the rate of net heat
2000°F (1093°C), measured at the appliance removal to the rate of total energy input,
flue outlet. calculated under designated operating
conditions and expressed in consistent units, as
CHIMNEY, HIGH-HEAT APPLIANCE-TYPE is a determined using the applicable test method in
factory-built, masonry or metal chimney suitable the Appliance Efficiency Regulations or Section
for removing the products of combustion from 112.
fuel-burning high-heat appliances producing
combustion gases in excess of 2000°F COEFFICIENT OF PERFORMANCE (COP),
(1093°C), measured at the appliance flue outlet. HEATING, is the ratio of the rate of net heat
output to the rate of total energy input,
CHIMNEY CONNECTOR is the pipe which calculated under designated operating
conditions and expressed in consistent units, as
connects a fuel-burning appliance to a chimney.
determined using the applicable test method in
the Appliance Efficiency Regulations or Section
CLEAR WATER WASTE – Cooling water and 112.
condensate drainage from refrigeration and air-
conditioning equipment; cooled condensate from COMBINATION SPACE-HEATING AND
steam heating systems; cooled boiler blowdown WATER-HEATING APPLIANCE is an appliance
water. that is designed to provide both space heating
and water heating from a single primary energy
CLIMATE CONTROL SYSTEM See Space source.
CLIMATE ZONES are the 16 geographic areas BALANCING VALVE – A mixing valve which
of California for which the Commission has senses outlet temperature and incoming hot and
established typical weather data, prescriptive cold water pressure and compensates for
packages and energy budgets. Climate zone fluctuations in incoming hot and cold water
boundary descriptions are in the document temperatures and/or pressures to stabilize outlet
"California Climate Zone Descriptions" (July temperatures.
1995), incorporated herein by reference.
Figure 101-A is an approximate map of the 16 COMBINATION WASTE AND VENT SYSTEM
climate zones – A specially designed system of waste piping
embodying the horizontal wet venting of one or
CLINIC SINK – A sink designed primarily to more sinks or floor drains by means of a
receive wastes from bedpans and having a flush common waste and vent pipe, adequately sized
rim, an integral trap with a visible trap seal, and to provide free movement of air above the flow
the same flushing and cleansing characteristics line of the drain.
as a water closet.
COMBINED BUILDING SEWER – See Building
CLOSED COMBUSTION SOLID FUEL- Sewer, (Combined).
BURNING APPLIANCE is a heat- producing
appliance that employs a combustion chamber COMMISSARIES SERVING MOBILE FOOD
that has no openings other than the flue collar, PREPARATION UNITS [FOR DHS] – A food
fuel charging door and adjustable openings establishment in which food, containers,
provided to control the amount of combustion air equipment or supplies are stored or handled for
that enters the combustion chamber. use in vehicles, mobile food preparation units,
food carts or vending machines.
CLTD is the Cooling Load Temperature
Difference COMBINED HYDRONIC SPACE/WATER
HEATING SYSTEM is a system which both
CMC is the 2001 California Mechanical Code. domestic hot water and space heating
is supplied from the same water heating plane. The conditioned footprint area may be
equipment. Combined hydronic space heating equal to the first floor area, or it may be greater,
may include both radiant floor systems if upper floors project over lower floors. One way
and convective or fan coil systems. to think of the conditioned footprint area
is as the area of the largest conditioned floor in
COMBUSTION AIR is the total amount of air the building plus the conditioned floor area of
provided to the space which contains fuel- any projections from other stories that extend
burnIng equipment. Includes air for fuel beyond the outline of that largest floor.
combustion, draft hood dilution and ventilation of
the equipment enclosure. CONDITIONED SPACE is an area, room or
space normally occupied and being heated or
COMPLIANCE APPROACH is any one of the cooled for human habitation by any equipment.
allowable methods by which the design and
construction of a building may be demonstrated CONDITIONED VOLUME is the total volume (in
to be in compliance with Part 6. The compliance cubic feet) of the conditioned space within a
approaches are the performance compliance building.
approach and the prescriptive compliance
approach. The requirements for each CONFINED SPACE is a room or space having a
compliance approach are set forth in Section volume less than fifty (50) cubic feet (1.42 m 3)
100 (d) 2 of Part 6. per 1000 Btu/h (293 W) of the aggregate input
rating of all fuel-burning appliances installed in
COMPRESSOR, POSITIVE DISPLACEMENT is that space.
a compressor in which increase in pressure is
attained by changing the internal volume of the CONTAMINATION – An impairment of the
compression chamber. quality of the potable water which creates an
actual hazard to the public health through
COMPRESSOR REFRIGERANT is a machine, poisoning or through the spread of disease by
with or without accessories, for compressing a sewage, industrial fluids or waste. Also defined
refrigerant vapor. as High Hazard.
CONDENSER is the part of the system CONTINUOUS DIMMING is a lighting control
designed to liquefy refrigerant vapor by removal method that is capable of varying the light
of heat. output of lamps over a continuous range from
full light output to minimum light output.
CONDENSING APPLIANCE is an appliance
CONTINUOUS VENT – A vertical vent that is a
which condenses part of the water vapor
continuation of the drain to which it connects
generated by the burning of hydrogen in fuels.
CONTINUOUS WASTE – A drain connecting
CONDENSING UNIT is a mechanical the compartments of a set of fixtures to a trap or
refrigeration system, consisting of one or more connecting other permitted fixtures to a common
power-driven compressors, condensers, liquid trap.
receivers if provided, and the regularly furnished
accessories which have been factory assembled CONTROLLED VENTILATION CRAWL
and tested prior to its installation. SPACE (CVC) is a crawl space in a residential
building where the side walls of the crawlspace
CONDITIONED FLOOR AREA (CFA) is the are insulated rather than the floor above the
floor area (in square feet) of enclosed crawlspace. A CVC has automatically controlled
conditioned space on all floors of a building, as crawl space vents. Credit for a CVC is permitted
measured at the floor level of the exterior for low-rise residential buildings that use the
surfaces of exterior walls enclosing the performance approach to compliance.
COOL ROOF is a roofing material with high
CONDITIONED FOOTPRINT is a projection of thermal emittance and high solar reflectance, or
all conditioned space on all floors to a vertical lower thermal emittance and exceptionally high
solar reflectance as specified in Section 118 (i), approved device shall constitute the critical
that reduces heat gain through the roof. level.
COOL ROOF RATING COUNCIL (CRRC) is a CROSS - CONNECTION – Any connection or
not-for-profit organization designated by the arrangement, physical or otherwise, between a
Commission as the Supervisory Entity with potable water supply system and any plumbing
responsibility to rate and label the reflectance fixture or any tank, receptor, equipment or
and emittance of roof products. device, through which it may be possible for
non-potable, used, unclean, polluted and
COOLING is air cooling to provide a room or contaminated water, or other substances, to
space temperature of 68°F (20°C) or above. enter into any part of such potable water system
under any condition.
COOLING LOAD is the rate at which heat must
be extracted from a space to maintain a desired CRRC See Cool Roof Rating Council.
CTI is the Cooling Tower Institute.
COOLING LOAD TEMPERATURE
DIFFERENCE (CLTD) is an equivalent C-VALUE (also known as C-factor) is the time
temperature difference used for calculating the rate of heat flow through unit area of a body
instantaneous external cooling loads across a induced by a unit temperature difference
wall or roof. The cooling load is the CLTD x U- between the body surfaces, in Btu/(hr. x ft.2 x
factor x Area. °F). It is not the same as K-value or K-factor.
COOLING SYSTEM is all of that equipment, DAMPERS shall be defined as follows:
including associated refrigeration, intended or Fire Damper is an automatic-closing metal
installed for the purpose of cooling air by assembly of one or more louvers, blades, slats
mechanical means and discharging such air into or vanes complying with recognized standards.
any room or space. This definition shall not Smoke Damper is a damper arranged to seal
include any evaporative cooler. off air flow automatically through a part of an air
duct system so as to restrict the passage of
COOLING UNIT is a self-contained refrigeration smoke. Volume Damper is any device which
system which has been factory assembled and when installed will restrict, retard or direct the
tested, installed with or without conditioned air flow of air in any duct, or the products of
ducts and without connecting any refrigerant- combustion in any heat-producing equipment, its
containing parts. This definition shall not include vent connector, vent or chimney therefrom.
a portable cooling unit or an absorption unit.
DAYLIT AREA is the floor area that is
COP See Coefficient of Performance illuminated by daylight through vertical glazing or
skylights as specified in Section 131(c).
COVERED MULTIFAMILY DWELLING – [For
HCD 1/AC] See Section 101.11 (under “HCD DECORATIVE GAS APPLIANCE is a gas
1/AC”) of this code. appliance that is designed or installed for visual
effect only, cannot burn solid wood, and
CRITICAL LEVEL – The critical level (C-L or simulates a fire in a fireplace.
C/L) marking on a backflow prevention device or
vacuum breaker is a point conforming to DEGREE DAY, HEATING is a unit, based upon
approved standards and established by the temperature difference and time, used in
testing laboratory (usually stamped on the estimating fuel consumption and specifying
device by the manufacturer) which determines nominal annual heating load of a building. For
the minimum elevation above the flood level rim any one day, when the mean temperature is less
of the fixture or receptor served at which the than 65°F, there exist as many degree
device may be installed. When a backflow days as there are Fahrenheit degrees difference
prevention device does not bear a critical level in temperature between the mean temperature
marking, the bottom of the vacuum breaker, for the day and 65°F.
combination valve, or the bottom of any such
DEMISING PARTITIONS are barriers that DISTRICT HEATING PLANT is a power boiler
separate conditioned space from enclosed plant designed to distribute hot water or steam
unconditioned space. to users located off the premises.
DEMISING WALL is a wall that is a demising DOMESTIC SEWAGE – The liquid and water-
partition. borne wastes derived from the ordinary living
processes, free from industrial wastes, and of
DESIGN CONDITIONS are the parameters and such character as to permit satisfactory
conditions used to determine the performance disposal, without special treatment, into the
requirements of space-conditioning systems. public sewer or by means of a private sewage
Design conditions for determining design disposal system.
heating and cooling loads are specified in
Section 144 (b) for nonresidential, highrise DOWNSPOUT – The rain leader from the roof to
residential, and hotel/motel buildings and in the building storm drain, combined building
Section 150 (h) for low-rise residential buildings. sewer, or other means of disposal located
outside of the building. See Conductor and
DESIGN HEAT GAIN RATE is the total Leader.
calculated heat gain through the building
envelope under design conditions. DRAFT HOOD is a device built into an
appliance or made a part of the vent connector
DESIGN HEAT LOSS RATE is the total
from an appliance, which is designed to:
calculated heat loss through the building
1. Assure the ready escape of the flue gases in
envelope under design conditions.
the event of no draft, back draft or stoppage
beyond the draft hood.
DEVELOPED LENGTH – The length along the
2. Prevent a back draft from entering the
center line of a pipe and fittings appliance.
3. Neutralize the effect of stack action of the
DIRECT GAS-FIRED MAKEUP AIR HEATER is
chimney or gas vent upon the operation of the
a heater in which all the products of combustion
generated by the gas-burning device are
released into the outside airstream being
heated. DRAIN – Any pipe which carries waste or water-
borne wastes in a building drainage system.
DIRECT VENT APPLIANCE is an appliance
DRAINAGE SYSTEM – Includes all the piping
which is constructed and installed so that all air
within public or private premises, which conveys
for combustion is derived from the outside sewage or other liquid wastes to a legal point of
atmosphere and all flue gases are discharged to disposal, but does not include the mains of a
the outside atmosphere.
public sewer system or a public sewage
treatment or disposal plant.
DIRECTLY CONDITIONED SPACE is an
enclosed space that is provided with wood DUCT is any tube or conduit for transmission of
heating, is provided with mechanical heating that air. This definition shall not include:
has a capacity exceeding 10 Btu/(hr.×ft.²), or is
1. A vent, a vent connector or a chimney
provided with mechanical cooling that has a
capacity exceeding 5 Btu/(hr.×ft.²), unless
2. Any tube or conduit wherein the pressure of
the space-conditioning system is designed and the air exceeds one (1) pound per square inch.
thermostatically controlled to maintain a process 3. The air passages of listed self- contained
environment temperature less than 55°F or to
maintain a process environment temperature
greater than 90°F for the whole space that the
system serves, or unless the space-conditioning DUCT FURNACE is a warm air furnace normally
system is designed and controlled to be installed in an air-distribution duct to supply
incapable of operating at temperatures above warm air for heating . This definition shall apply
55°F or incapable of operating at temperatures only to a Warm air heating appliance which
below 90°F at design conditions. depends for air circulation on a blower not
furnished as part of the furnace.
DUCT LOSSES is heat transfer into or out of a EFFICACY, LAMP is the quotient of rated initial
space conditioning system duct through lamp lumens divided by the rated lamp power
conduction or leakage. (watts), without including auxiliaries such as
ballasts, measured at 25°C according to IESNA
DUCT SEALING is a procedure for installing a and ANSI Standards.
space conditioning distribution system that
minimizes leakage of air from or to the EFFICACY, LIGHTING SYSTEM is the quotient
distribution system. Minimum specifications for of rated initial lamp lumens measured at 25°C
installation procedures, materials, diagnostic according to IESNA and ANSI Standards, times
testing and field verification are contained the ballast factor, divided by the input power
in the Residential and Nonresidential ACM (watts) to the ballast or other auxiliary device
Approval Manuals. (e.g. transformer); expressed in lumens per
DUCT SYSTEM includes all ducts, duct fittings,
plenums and fans assembled to form a ELECTRIC HEATING APPLIANCE is a device
continuous passageway for the distribution of which produces heat energy to create a warm
air. environment by the application of electric power
to resistance elements, refrigerant compressors
DWELLING UNIT [Not adopted by HCD] is a or dissimilar material junctions.
building or portion thereof which contains living
facilities, including provisions for sleeping, ELECTRICAL CODE [Not adopted by HCD] is
eating, cooking and sanitation, as required by the National Electrical Code promulgated by the
this code, for not more than one family. National Fire Protection Association, as adopted
by this jurisdiction. Exception: [For HCD 1 &
ECONOMIZER, AIR is a ducting arrangement HCD 2] Whenever the term “Electrical Code” is
and automatic control system that allows a used in this code, it shall mean the California
cooling supply fan system to supply outside air Electrical Code, Title 24, Part 3.
to reduce or eliminate the need for mechanical
cooling. ELECTRIC RESISTANCE HEATING is a
heating system that converts electric energy
ECONOMIZER, WATER is a system by which directly into heat energy by passing a current
the supply air of a cooling system is cooled through an electric resistance. Electric
directly or indirectly by evaporation of water, or resistance heat is inherently less efficient than
other appropriate fluid, in order to reduce or gas as a heating energy source because it must
eliminate the need for mechanical cooling. account for losses associated with generation
from depletable fossil fuels and transmission to
EER See Energy Efficiency Ratio. the building site.
EFFECTIVE APERTURE (EA) is the extent that EMITTANCE, THERMAL is the ratio of the
vertical glazing or skylights are effective for radiant heat flux emitted by a sample to that
providing daylighting. The effective aperture for emitted by a blackbody radiator at the same
vertical glazing is specified in Exception 1 to temperature.
Section 131(c). The effective aperture for
skylights is specified in Section 146 (a) 4 F. ENERGY BUDGET is the maximum amount of
Time Dependent Valuation (TDV) energy that a
EFFECTIVE OPENING – The minimum cross- proposed building, or portion of a building, can
sectional area at the point of water supply be designed to consume, calculated with the
discharge measured or expressed in terms of: approved procedures specified in Title 24, Part
(1) diameter of a circle, or 6. ACM Joint Appendix I - Glossary
(2) if the opening is not circular, or the diameter 2005 Joint Appendices Page I-14
of a circle of equivalent cross-sectional area.
(This is applicable also to airgap.) ENERGY EFFICIENCY RATIO (EER) is the
ratio of net cooling capacity (in Btu/hr.) to total
rate of electrical energy (in watts), of a cooling
system under designated operating conditions,
as determined using the applicable test method FENESTRATION AREA is the area of
in the Appliance Efficiency Regulations fenestration products (i.e., windows, skylights
or Section 112. and glass doors) in exterior openings, including
the sash or frame area. The nominal area (from
ENERGY FACTOR (EF) is the ratio of energy nominal dimensions such as 4040) or rough
output to energy consumption of a water opening is also acceptable. Where the term
heater, expressed in equivalent units, under "glazing area" is used in the standards it is the
designated operating conditions over a 24-hour entire fenestration area, not just the area of
use cycle, as determined using the applicable glazing, unless stated otherwise.
test method in the Appliance Efficiency See Fenestration Product, Glazing Area and
ENFORCING AGENCY [FOR HCD 1 & 2, SFM, FENESTRATION PRODUCT is any transparent
DSA/SS, OSHPD 1, 2, 3 & 4] is the designated or translucent material plus any sash, frame,
department or agency as specified in statutes to mullions and dividers, in the envelope of a
enforce the specific building standards building, including, but not limited to, windows,
promulgated or adopted by the specified state sliding glass doors, French doors, skylights,
agency. curtain walls, garden windows, and other doors
with a glazed area of more than one half of the
EVAPORATIVE COOLER is a device used for door area.
reducing the sensible heat of air for cooling by
FENESTRATION SYSTEM is a collection of
the process of evaporation of water into an
fenestration products included in the design of
See Fenestration Product.
EVAPORATIVE COOLING SYSTEM is all of
that equipment intended or installed for the FIELD ERECTED COOLING TOWERS are
purpose of environmental cooling by an cooling towers which are custom designed for a
evaporative cooler from which the conditioned specific application and which can not be
air is distributed through ducts or plenums to the delivered to a project site in
conditioned area. the form of factory assembled modules due to
their size, configuration, or materials of
EVAPORATOR is that part of a refrigeration construction.
system in which liquid refrigerant is vaporized to ACM Joint Appendix I - Glossary
produce refrigeration. 2005 Joint Appendices Page I-16
ENVELOPE See Building Envelope. FIELD-FABRICATED FENESTRATION
PRODUCT OR EXTERIOR DOOR
EXFILTRATION is uncontrolled outward air is a fenestration product or exterior door whose
leakage from inside a building, including leakage frame is made at the construction site of
through cracks and interstices, around standard dimensional lumber or other
windows and doors, and through any other materials that were not previously cut, or
exterior partition or duct penetration. otherwise formed with the specific intention of
being used to fabricate a fenestration
EXPOSED THERMAL MASS is mass that is product or exterior door. Field fabricated does
directly exposed (uncovered) to the conditioned not include sitebuilt fenestration with a label
space of the building. Concrete floors that are certificate or products required to have
covered by carpet are not considered exposed temporary or permanent labels.
FIRE CODE [Not adopted by HCD] is the fire
FACTORY ASSEMBLED COOLING TOWERS code adopted by this jurisdiction.
are cooling towers constructed from factory
assembled modules either shipped to the site in FIREPLACE STOVE is a chimney- connected,
one piece or put together in the field. solid-fuel-burning stove (appliance) having part
of its fire chamber open to the room.
FIRE-RESISTIVE CONSTRUCTION is FOOD ESTABLISHMENT [FOR DHS] – Any
construction complying with the requirements of room, building, place or portion thereof,
the Building Code for the time period specified. maintained, used or operated for the purpose of
storing, preparing, serving, packaging,
FIXTURE BRANCH – A water supply pipe transporting, salvaging or otherwise handling
between the fixture supply pipe and the water food at the retail level.
FOOD PREPARATION EQUIPMENT is cooking
FIXTURE DRAIN – The drain from the trap of a equipment intended for commercial use,
fixture to the junction of that drain with any other including coffee machines, espresso coffee
drain pipe. makers, conductive cookers, food warmers
including heated food servers, fryers, griddles,
FIXTURE SUPPLY – A water supply pipe nut warmers, ovens, popcorn makers, steam
connecting the fixture with the fixture branch. kettles, ranges, and cooking appliances for use
in commercial kitchens, restaurants, or other
FIXTURE UNIT – A quantity in terms of which business establishments where food is
the load-producing effects on the plumbing dispensed.
system of different kinds of plumbing fixtures are
expressed on some arbitrarily chosen scale. FORCED AIR-TYPE CENTRAL FURNACE is a
central furnace equipped with a fan or blower
FLOOD LEVEL – See Flooded. which provides the primary means for circulation
FLOOD LEVEL RIM – The top edge of a
receptor from which water overflows. HORIZONTAL-TYPE CENTRAL FURNACE is a
furnace designed for low headroom installations
FLOOR FURNACE is a completely self- with airflow through the appliance in a horizontal
contained furnace suspended from the floor of path.
the space being heated, taking air for
combustion from outside such space and with U P F L O W-TYPE CENTRAL FURNACE is a
means for observing flames and lighting the furnace designed with air flow essentially in a
appliance from such space. vertical path, discharging air at or near the top of
FLUSH TANK – A tank located above or integral
with water closets, urinals, or similar fixtures for D O W N F L O W-TYPE CENTRAL FURNACE
the purpose of flushing the usable portion of the is a furnace designed with air flow essentially in
fixture. a vertical path, discharging air at or near the
bottom of the furnace.
FLUSH VALVE – A valve located at the bottom
of a tank for the purpose of flushing water ENCLOSED FURNACE is a specific heating or
closets and similar fixtures. heating and ventilating furnace incorporating an
integral total enclosure and using only outside
FLUSHOMETER TANK – A tank integrated
air for combustion.
within an air accumulator vessel which is
designed to discharge a predetermined quantity
of water to fixtures for flushing purposes. FRACTIONATION is a change in composition of
a blend by preferential evaporation of the more
FLUSHOMETER VALVE – A valve which volatile component or condensation of the less
discharges a predetermined quantity of water to volatile component.
fixtures for flushing purposes and is actuated by
direct water pressure. FUSIBLE PLUG is a device arranged to relieve
pressure by operation of a fusible member at a
FLUX is the rate of the energy flow per unit predetermined temperature.
GAP WIDTH is the distance between glazings in
multi-glazed systems. This is typically measured
from inside surface to inside surface, though GROUND SOURCE HEAT PUMP is a heat
some manufacturers may report “overall” IG pump that uses the earth as a source of energy
width, which is measured from outside surface for heating and a sink for energy when cooling.
to outside surface. Some systems pump water from an aquifer in
the ground and return the water to the ground
GAS COOLING EQUIPMENT is cooling after transferring heat from or to the water. A few
equipment that produces chilled water or cold air systems use refrigerant directly in a loop of
using natural gas or liquefied petroleum gas as piping buried in the ground. Those heat pumps
the primary energy source. that use either a water loop or pump water from
an aquifer have efficiency test methods that
GAS HEATING SYSTEM is a natural gas or are accepted by the Energy Commission. These
liquified petroleum gas heating system. efficiency values are certified to the Energy
Commission by the manufacturer and are
GAS INFILLS are air, argon, krypton, CO2, SF6, expressed in terms of heating Coefficient
or a mixture of these gasses between the panes of Performance (COP) and cooling Energy
of glass in insulated glass units. Efficiency Ratio (EER).
GEOTHERMAL HEAT PUMP See Ground HARD COAT is a low emissivity metallic coating
Source Heat Pump. applied to the glass, which will be installed in a
fenestration product, through a pyrolytic
GLAZING See Fenestration Product. process (at or near the melting point of the glass
so that it bonds with the surface layer of glass).
GLAZING AREA See Fenestration Area. Hard coatings are less susceptible to oxidation
and scratching as compared to soft
GRAVITY HEATING SYSTEM is any heating coats. Hard coatings generally do not have as
system consisting of a gravity-type warm air low emissivity as soft coats.
furnace, together with all air ducts or pipes and
accessory apparatus installed in connection HEAT CAPACITY (HC) is the amount of heat
therewith. necessary to raise the temperature of all
the components of a unit area in an assembly by
GRAVITY-TYPE WARM AIR FURNACE is a 1°F. It is calculated as the sum of the average
warm air furnace depending primarily on thickness times the density times the specific
heat for each component, and is expressed in
circulation of air through the furnace by gravity.
Btu per square foot per °F.
This definition also shall include any furnace
approved with a booster-type fan which does not
HEAT PUMP is a device that is capable of
materially restrict free circulation of air through
the furnace when the fan is not in operation. heating by refrigeration, and that
may include a capability for cooling.
GREASE INTERCEPTOR – An interceptor of at
HEAT (ENERGY) RECOVERY VENTILATOR is
least 750 gallon (2839 L) capacity to serve one
a device intended to remove air from buildings,
(1) or more fixtures and which shall be remotely
located. replace it with outside air, and in the process
transfer heat from the warmer to the colder
GREASE TRAP – A device designed to retain airstreams.
grease from one (1) to a maximum of four (4)
fixtures. HEATED SLAB FLOOR is a concrete slab floor
or a lightweight concrete topping slab laid over a
GREENHOUSE WINDOW is a type of raised floor, with embedded space heating hot
fenestration product which adds conditioned water pipes. The heating system using the
volume but no conditioned floor area to a heated slab is sometimes referred to as radiant
building. slab floors or radiant heating.
GRILLES See Dividers. HEATING DEGREE DAY is a unit, based upon
temperature difference and time, used in
estimating fuel consumption and specifying
nominal annual heating load of a building. For (including heat pump cooling equipment) with
any one day when the mean temperature is less less than 65,000 Btu/h output capacity is rated
than 65°F (18°C), there exist as many degree by the Seasonal Energy Efficiency Ratio (SEER)
days as there are Fahrenheit degrees difference (equipment of this size may also be rated by the
in temperature between meantemperature for EER). Electric cooling equipment (including heat
the day and 65°F (18°C). pump cooling equipment) with an output
capacity of 65,000 Btu/h or more is rated by the
HEATING EQUIPMENT includes all warm air Energy Efficiency Ratio (EER).
furnaces, warm air heaters, combustion
products vents, heating air-distribution ducts and HERS PROVIDER see Home Energy Rating
fans, all steam and hot water piping, together System Provider.
with all control devices and accessories installed
as part of, or in connection with, any HERS RATER See Home Energy Rating
environmental heating system or appliance System Rater.
regulated by this code.
HIGH-RISE RESIDENTIAL BUILDING is a
HEATING SEASONAL PERFORMANCE building, other than a hotel/motel, of Occupancy
FACTOR (HSPF) Group R, Division 1 with four or more habitable
is the total heating output of a central air-
conditioning heat pump during its normal usage
HOME ENERGY RATING SYSTEM
period for heating, divided by the total electrical
PROVIDER is an organization that the
energy input in watt-hours during the same
Commission has approved to administer a home
period, as determined using the applicable test
energy rating system program, certify raters
method the Appliance Efficiency Regulations.
ACM Joint Appendix I - Glossary and maintain quality control over field verification
2005 Joint Appendices Page I-19 and diagnostic testing required for compliance
with the Energy Efficiency Standards.
HEATING SYSTEM is a warm air heating plant HOME ENERGY RATING SYSTEM RATER is a
consisting of a heat exchanger enclosed in a person certified by a Commission approved
casing, from which the heated air is distributed HERS Provider to perform the field verification
through ducts to various rooms and areas. A and diagnostic testing required for
heating system includes the outside air, return a demonstrating compliance with the Energy
i r and supply air system and all accessory Efficiency Standards.
apparatus and equipment installed in connection
HOOD is an air intake device connected to a
HEATING, VENTILATING AND AIR
CONDITIONING (HVAC) SYSTEM mechanical exhaust system for collecting
is the mechanical heating, ventilating and air vapors, fumes, smoke, dust, steam, heat or
conditioning system of the building, also known odors from, at or near the equipment, place or
as the HVAC system. The standards use various area where generated, produced or released.
measures of equipment efficiency defined
according to the type of equipment installed. HVAC SYSTEM See HVAC, See Space
Gas (fossil fuel) heating equipment is rated by Conditioning System.
the Annual Fuel Utilization Efficiency (AFUE).
The heating efficiency of electric heat pumps HYDRONIC COOLING SYSTEM is any cooling
with less than 65,000 Btu/h cooling capacity is system which uses water or a water solution as
rated by the Heating Seasonal Performance a source of cooling or heat rejection, including
Factor (HSPF). The heating efficiency of heat chilled water systems (both air and water-
pumps with cooling capacity of 65,000 Btu/h or cooled) as well as water-cooled or evaporatively
more is rated by the Coefficient of Performance cooled direct expansion systems, such as water
(COP). Electric resistance heating is rated by source (water-to-air) heat pumps.
HSPF or COP. All electric cooling equipment
HYDRONIC SPACE HEATING SYSTEM is a INSULATION Insulation is a material that limits
system that uses water-heating equipment, such heat transfer. Insulating material of the types
as a storage tank water heater or a boiler, to and forms listed in Section 118(a) of the
provide space heating. Hydronic space heating Standards, may be installed only if the
systems include both radiant floor systems and manufacturer has certified that the insulation
convective or fan coil systems. complies with the Standards for Insulating
See Combined Hydronic Space/Water Heating Material, Title 24, Part 12, Chapter 12-
System 13 of the California Code of Regulations.
Insulation must be placed within or contiguous
INDIRECTLY CONDITIONED SPACE is with a wall, ceiling or floor, or over the surface of
enclosed space, including, but not limited to, any appliance or its intake or outtake
unconditioned volume in atria, that (1) is not mechanism for the purpose of reducing heat
directly conditioned space; and (2) either (a) has transfer or reducing adverse temperature
a thermal transmittance area product (UA) to fluctuations of the building, room or appliance.
directly conditioned space exceeding that to the Insulation may be installed in wall, ceiling/roof
outdoors or to unconditioned space and does and raised floor assemblies and at the edge of a
not have fixed vents or openings to the outdoors slab-on-grade. Movable insulation is designed to
or to unconditioned space, or (b) is a space cover windows and other glazed openings part
through which air from directly conditioned of the time to reduce heat loss and heat gain.
spaces is transferred at a rate exceeding three
air changes per hour. INTEGRATED PART LOAD VALUE (IPLV) is a
single number figure of merit based on part load
INDIRECT WASTE PIPE – A pipe that does not EER or COP expressing part load efficiency for
connect directly with the drainage system but air-conditioning and heat pump equipment on
conveys liquid wastes by discharging into a the basis of weighted operation at various load
plumbing fixture, interceptor, or receptacle which capacities for the equipment as determined
is directly connected to the drainage system. using the applicable test method in the
Appliance Efficiency Regulations or Section 112.
INDUSTRIAL HEATING EQUIPMENT includes ACM Joint Appendix I – Glossary 2005 Joint
appliances, devices or equipment used, or Appendices Page I-22
intended to be used, in an industrial,
manufacturing or commercial occupancy for ISOLATION DEVICE is a device that prevents
applying heat to any material being processed, the conditioning of a zone or group of
but shall not include water heaters, boilers, or zones in a building while other zones of the
portable equipment used by artisans in pursuit of building are being conditioned.
INVERT – The lowest portion of the inside of a
INFILTRATION CONTROLS are measures horizontal pipe.
taken to control the infiltration of air. Mandatory
LAVATORY [For HCD 1, HCD 2 & DSA/AC] – A
Infiltration control measures include
plumbing fixture used for washing the hands,
weatherstripping, caulking, and sealing in and
arms, face and head.
around all exterior joints and openings.
LAVATORIES IN SETS – Two (2) or three (3)
INSTALLATION CERTIFICATE (CF-6R) is a
lavatories that are served by one (1) trap.
document with information required by the
Commission that is prepared by the builder or
LEADER – An exterior vertical drainage pipe for
installer verifying that the measure was installed
to meet the requirements of the standards. conveying storm water from roof or gutter drains.
INSULATING GLASS UNIT is a self-contained
LIQUID LINE is the refrigerant line that leads
unit, including the glazings, spacer(s), films
from the condenser to the evaporator in a split
(if any), gas infills, and edge caulking, that is
system air conditioner or heat pump. The
installed in fenestration products. It does not
include the frame. refrigerant in this line is in a liquid state and is at
an elevated temperature. This line should not be
designed to distribute the light, to position and
LOW-E COATING is a low emissivity metallic protect the lamp, and to connect the lamp to the
coating applied to glazing in power supply; commonly referred to as "lighting
fenestration products. fixtures" or "instruments."
See Soft Coat and Hard Coat.
MACERATING TOILET SYSTEM – A system
LIQUID LINE is the refrigerant line that leads comprised of a sump with macerating pump and
from the condenser to the evaporator in a split with connections for a water closet and other
system air conditioner or heat pump. The plumbing fixtures, which is designed to accept,
refrigerant in this line is in a liquid state and is at grind and pump wastes to an approved point of
an elevated temperature. This line should not be discharge.
MAIN – The principal artery of any system of
LOW-E COATING is a low emissivity metallic continuous piping to which branches may be
coating applied to glazing in fenestration connected.
See Soft Coat and Hard Coat. MAIN SEWER – See Public Sewer.
LOW PRESSURE HOT WATER-HEATING MAIN VENT – The principal artery of the venting
BOILER is a boiler furnishing hot water at system to which vent branches may be
pressures not exceeding 160 pounds per square connected.
inch (1102.4 kPa) and at temperatures not
exceeding 250°F (121°C). MANDATORY MEASURES CHECKLIST
(MF-1R) is a form used by the building plan
LOW PRESSURE STEAM-HEATING BOILER checker and field inspector
is a boiler furnishing steam at pressures not to verify compliance of the building with the
prescribed list of mandatory features, equipment
exceeding fifteen (15) pounds per square inch
efficiencies and product certification
requirements. The documentation author
indicates compliance by initialing, checking, or
LOW-RISE RESIDENTIAL BUILDING is a marking N/A (for features
building, other than a hotel/motel that is of not applicable) in the boxes or spaces provided
Occupancy Group R, Division 1, and is three for the designer.
stories or less, or that is of Occupancy Group R,
Division 3. MECHANICAL COOLING is lowering the
temperature within a space using refrigerant
LOW SIDE refers to the parts of a refrigeration compressors or absorbers, desiccant
system subjected to approximate evaporator dehumidifiers, or other systems that require
pressure. energy from depletable sources to directly
condition the space. In nonresidential, high-rise
residential, and hotel/motel buildings cooling of a
LOW-SLOPED ROOF is a roof that has a ratio space by direct or indirect evaporation of water
of rise to run of 2:12 or less. alone is not considered mechanical cooling.
LPG is Liquefied Petroleum Gas. Propane is one
type of LPG. MECHANICAL HEATING is raising the
temperature within a space using electric
LUMENS/WATT is the amount of light available resistance heaters, fossil fuel burners, heat
from a given light source (lumens) divided by the pumps, or other systems that require energy
power requirement for that light source from depletable sources to directly condition the
(watts). The more usable light that a light source space.
provides per watt, the greater its efficacy.
See Efficacy. MOBILE HOME PARK SEWER – That part of
the horizontal piping of a drainage system which
LUMINAIRE is a complete lighting unit begins two (2) feet (610 mm) downstream from
consisting of a lamp and the parts the last mobile home site and conveys it to a
public sewer, private sewer, private sewage Occupancy
disposal system, or other point of disposal NOTE: Requirements for high-rise residential
buildings and hotels/motels are included in the
MOTION SENSOR, LIGHTING is a device that nonresidential sections of Title 24, Part 6.
automatically turns lights off soon after an area
is vacated. The term Motion Sensor applies to a NONRESIDENTIAL MANUAL is the manual
device that controls outdoor lighting systems. developed by the Commission, under Section
When the device is used to control indoor 25402.1(e) of the Public Resources Code, to aid
lighting systems, it is termed an occupant designers, builders and contractors in meeting
sensor. The device also may be called an the energy efficiency requirements for
occupancy sensor, or occupant sensing device. nonresidential, high-rise residential, and
MULLION is a vertical framing member
separating adjoining window or door sections. OCCUPANCY TYPE is one of the following:
See Dividers Auditorium is the part of a public building where
an audience sits in fixed seating, or a room,
MULTI-FAMILY DWELLING UNIT is a dwelling area, or building with fixed seats used for public
unit of occupancy type R, as defined by the meetings or gatherings not specifically for the
CBC, sharing a common wall and/or ceiling/floor viewing of dramatic performances.
with at least one other dwelling unit. Auto repair is the portion of a building used to
ACM Joint Appendix I - Glossary repair automotive equipment and/or vehicles,
2005 Joint Appendices Page I-25 exchange parts, and may include work using an
open flame or welding equipment.
MULTI-LEVEL LIGHTING CONTROL is a Civic meeting space is a city council or board of
lighting control that reduces lighting power in supervisors meeting chamber, courtroom, or
multiple steps while maintaining a reasonably other official meeting space accessible to the
uniform level of illuminance throughout the area public .
controlled. Classroom, lecture, or training is a room or
area where an audience or class receives
MULTISCENE DIMMING SYSTEM is a lighting instruction.
control device that has the capability of setting Commercial and industrial storage is a room,
light levels throughout a continuous range, and area, or building used for storing items.
that has preestablished settings within the Convention, conference, multipurpose and
range. NFRC is the National Fenestration Rating meeting centers are assembly rooms, areas, or
Council. This is a national organization of buildings used for meetings, conventions and
fenestration product manufacturers, glazing multiple purposes, including but not limited to,
manufacturers, manufacturers of related dramatic performances, and that has neither
materials, utilities, state energy offices, fixed seating nor fixed staging.
laboratories, home builders, specifiers Corridor is a passageway or route into which
(architects), and public interest groups. compartments or rooms open.
This organization is designated by the Dining is a room or rooms in a restaurant or
Commission as the Supervisory Entity, which is hotel/motel (other than guest rooms) where
responsible for rating the U-factors and solar meals that are served to the customers will be
heat gain coefficients of manufactured consumed.
fenestration products (i.e., windows, skylights, ACM Joint Appendix I - Glossary
glazed doors) that must be used in compliance 2005 Joint Appendices Page I-27
calculations. Dormitory is a building consisting of multiple
See also Fenestration Area and Fenestration sleeping quarters and having interior common
Product. areas such as dining rooms, reading rooms,
exercise rooms, toilet rooms, study rooms,
NONCARRIAGE TOILET FACILITY [For hallways, lobbies, corridors, and stairwells, other
DSA/SS] – A toilet facility not connected to a than high-rise residential, low-rise residential,
sewer. and hotel/motel occupancies.
Electrical/mechanical room is a room in which
NONRESIDENTIAL BUILDING is any building the building’s electrical switchbox or control
which is a Group A, B, E, F, H, M, or S
panels, and/or HVAC controls or equipment is being sound in body or mind through medical,
located. dental, or psychological examination and
Exercise center/gymnasium is a room or treatment, including, but not limited to,
building equipped for gymnastics, exercise laboratories and treatment facilities.
equipment, or indoor athletic activities. Museum is a space in which works of artistic,
Exhibit is a room or area that is used for historical, or scientific value are cared for and
exhibitions that has neither fixed seating nor exhibited.
fixed staging. Office is a room, area, or building of CBC Group
Financial transaction is a public establishment B Occupancy other than restaurants.
used for conducting financial transactions Parking garage is a covered building or
including the custody, loan, exchange, or issue structure for the purpose of parking vehicles,
of money, for the extension of credit, and for which consists of at least a roof over the parking
facilitating the transmission of funds area, often with walls on one or more sides.
General commercial and industrial work is a Parking garages may have fences or rails in
room, area, or building in which an art, craft, place of one or more walls. The structure has an
assembly or manufacturing operation is entrance(s) and exit(s), and includes areas for
performed. vehicle maneuvering to reach the parking
High bay: Luminaires 25 feet or more above the spaces. If the roof of a parking structure
floor. is also used for parking, the section without an
Low bay: Luminaires less than 25 feet above overhead roof is considered a parking lot instead
the floor. of a parking garage.
Grocery sales is a room, area, or building that Precision commercial or industrial work is a
has as its primary purpose the sale of foodstuffs room, area, or building in which an art, craft,
requiring additional preparation prior to assembly or a manufacturing operation is
consumption. performed involving visual tasks of small size or
Kitchen/food preparation is a room or area fine detail such as electronic assembly, fine
with cooking facilities and/or an area where food woodworking, metal lathe operation, fine hand
is prepared. painting and finishing, egg processing
Laundry is a place where laundering activities operations, or tasks of similar visual difficulty.
occur. Religious worship is a room, area, or building
Library is a repository for literary materials, for worship.
such as books, periodicals, newspapers, Restaurant is a room, area, or building that is a
pamphlets and prints, kept for reading or food establishment as defined in Section 27520
reference. of the Health and Safety Code.
Lobby, Hotel is the contiguous space in a Restroom is a room or suite of rooms providing
hotel/motel between the main entrance and the personal facilities such as toilets and
front desk, including reception, waiting and washbasins.
seating areas. Retail merchandise sales is a room, area, or
Lobby, Main entry is the contiguous space in building in which the primary activity is the sale
buildings other than hotel/motel that is directly of merchandise.
located by the main entrance of the building School is a building or group of buildings that is
through which persons must pass, including predominately classrooms and that is used by
reception, waiting and seating areas. an organization that provides instruction to
Locker/dressing room is a room or area for students.
changing clothing, sometimes equipped with Senior housing is housing other than
lockers. Occupancy Group I that is specifically for
Lounge/recreation is a room used for leisure habitation by seniors, including but not limited to
activities which may be associated with a independent living quarters, and assisted living
restaurant or bar. quarters. Commons areas may include dining,
Mall is a roofed or covered common pedestrian reading, study, library or other community
area within a mall building that serves as access spaces and/or medical treatment or hospice
for two or more tenants. facilities.
Medical and clinical care is a room, area, or Stairs, active/inactive, is a series of steps
building that does not provide overnight patient providing passage from one level of a building to
care and that is used to promote the condition of another.
Support area is a room or area used as a purposes and not classed as a Group B or E
passageway, utility room, storage space, or Occupancy.
other type of space associated with or Division 3 . A building or portion of a building
secondary to the function of an occupancy that having an assembly room with an occupant load
is listed in these regulations. of less than 300 without a legitimate stage,
Tenant lease space is a portion of a building including such buildings used for educational
intended for lease for which a specific tenant is purposes and not classed as a Group B or E
not identified at the time of permit application. Occupancy.
Theater, motion picture, is an assembly room, Division 4. Stadiums, reviewing stands and
a hall, or a building with tiers of rising seats or amusement park structures not included within
steps for the showing of motion pictures. other Group A Occupancies. Specific and
Theater, performance, is an assembly room, a general requirements for grandstands, bleachers
hall, or a building with tiers of rising seats or and reviewing stands are in the Building Code .
steps for the viewing of dramatic performances, Exception : Amusement buildings, or portions
lectures, musical events and similar live thereof, which are without walls or a roof and
performances. constructed to prevent the accumulation of
Transportation function is the ticketing area, smoke in assembly areas.
waiting area, baggage handling areas,
concourse, or other areas not covered by Group B Occupancies Group B Occupancies
primary functions in Table 146-C in an airport shall include buildings, structures, or portions
terminal, bus or rail terminal or station, subway thereof, for office, professional or service-type
or transit station, or marine terminal. transactions, which are not classified as Group
Vocational room is a room used to provide H Occupancies. Such occupancies include
training in a special skill to be pursued as a occupancies for the storage of records and
trade. accounts and eating and drinking
Waiting area is an area other than a hotel lobby establishments with an occupant load of less
or main entry lobby normally provided with than fifty (50).
seating and used for people waiting.
Wholesale showroom is a room where
Group C Occupancies: [For SFM] 1.
samples of merchandise are displayed.
Organized Camp is a site with program and
facilities for the primary purposes of providing an
OCCUPANCY CLASSIFICATION outdoor group living experience with social,
spiritual, educational or recreational objectives
Group A Occupancies Group A Occupancies for five days or more during one or more
include the use of a building or structure, or a seasons per year. (see Section 18897 of the
portion thereof, for the gathering together of fifty Health and Safety Code.)
(50) or more persons for purposes such as civic,
social or religious functions, recreation, Group E Occupancies
education or instruction, food or drink Division 1. Any building used for educational
consumption, or awaiting transportation. A room th
purposes through the 12 grade by fifty (50) or
or space used for assembly purposes by less more persons for more than twelve (12) hours
than fifty (50) persons and accessory to another per week or four hours in any one day.
occupancy shall be included as a part of that Division 2. Any building used for educational
major occupancy. Assembly occupancies shall purposes through the 12th grade by less than
include the following: fifty (50) persons for more than twelve (12)
Division 1 . A building or portion of a building hours per week or four hours in any one day.
having an assembly room with an occupant load Division 3. Any building or portion thereof used
of 1,000 or more and a legitimate stage. for day-care purposes for more than six persons.
Division 2 . A building or portion of a building
having an assembly room with an occupant Group F Occupancies Group F Occupancies
load of less than 1,000 and a legitimate stage.
shall include the use of a building or structure, or
Division 2.1. A building or portion of a building
a portion thereof, for assembling, disassembling,
having an assembly room with an occupant load fabricating, finishing, manufacturing, packaging,
of 300 or more without a legitimate stage,
repair or processing operations that are not
including such buildings used for educational
classified as Group H Occupancies.
Division 1. Moderate-hazard factory and laboratories may be classified as Group B,
industrial occupancies shall include factory and Division 2
industrial uses which are not classified as Group Occupancies when the quantities of materials
F, Division 2 Occupancies. are not in excess of those listed in Tables 3-D
Division 2. Low-hazard factory and industrial and 3-E, California Building Code. Laboratories
occupancies shall include facilities producing having quantities of materials in excess of those
noncombustible or non-explosive materials listed in Table 3-E,California Building Code, and
which, during finishing, packing or processing, which are located below the fourth story may be
do not involve a significant fire hazard. classified as a Group H, Division 7 Occupancy .
Group H Occupancies Group H Occupancies Group I Occupancies
shall include buildings or structures, or portions
thereof, that involve the manufacturing, Division 1.1. Nurseries for the full-time care of
processing, generation or storage of materials children under the age of six (each
that constitute a high fire, explosion or health accommodating more than five children)
hazard. For definitions, identification and control [For SFM six children].Hospitals, sanitariums,
of hazardous materials and pesticides, and the nursing homes [ForSFM, OSHPD 1, 2 & 3] and
display of nonflammable solid and homes for the aged with non-ambulatory
nonflammable or noncombustible liquid patients, protective social-care facilities or
hazardous materials in Group B, F, M or S homes with nonambulatory guests, and similar
Occupancies, see the Fire Code. buildings (each accommodating more than five
Division 1. Occupancies with a quantity of patients or six patients, as required by the office
material in the building in excess of those listed of the State Fire Marshal).
in the Building Code, which present a high Division 1.2. Health care centers for ambulatory
explosion hazard. patients receiving outpatient medical care which
Division 2. Occupancies where combustible may render the patient incapable of unassisted
dust is manufactured, used or generated in such self-preservation (each tenant space
a manner that concentrations and conditions accommodating more than five such patients).
create a fire or explosion potential. Division 2. Nursing homes for ambulatory
Occupancies with a quantity of material in the patients [for SFM] where medical care is
building in excess of those listed in the Building provided, homes for ambulatory children six
Code, which present a moderate explosion years of age or over where medical care is
hazard or a hazard from accelerated burning. provided, or homes with ambulatory guests
Division 3. Occupancies where flammable where medical care is provided, and similar
solids, other than combustible dust, are buildings and honor farms and conservation
manufactured, used or generated. camps housing inmates who are not restrained
Division 4. Repair garages not classified as (each accommodating more than five patients or
Group S, Division 3 Occupancies. children [for SFM] six patients or children).
Division 5. Aircraft repair hangars and heliports Division 3. Mental hospitals, mental
not classified as Group S, Division 5 sanitariums, jails, prisons, reformatories and
Occupancies. buildings where personal liberties of inmates are
Division 6 . Semiconductor fabrication facilities similarly restrained.
and comparable research and development
areas in which hazardous production materials Group M Occupancies Group M Occupancies
(HPM) are used and the aggregate quantity of
shall include buildings, structures, or portions
materials is in excess of those listed in the
thereof, used for the display and sale of
Building Code. merchandise, and involving stocks of goods,
Division 7. Occupancies having quantities of
wares or merchandise, incidental to such
materials in excess of those listed in the Building
purposes and accessible to the public.
Code, which are health hazards.
Division 8. Laboratories and similar areas used
for scientific experimentation or research having Group R Occupancies
quantities of materials not in excess of those Division 1. Hotels and apartment houses.
listed in Tables 3-D.1 and 3- E, California Congregate residences (each accommodating
Building Code, and not otherwise classified as more than ten (10) persons).
Group B, Division 2 Occupancies. Such Division 2. Not used.
Division 2.1. [For SFM] Residentially - based, Ill.
licensed facilities accommodating more than six Division 2.3.1. [For SFM] Residentially - based
nonambulatory clients. This division may include facilities providing hospice care throughout
ambulatory clients. Licensing categories that accommodating six or less bedridden clients.
may use this classification include, but are not Licensing categories that may use this
limited to: Adult Residential Facilities, classification are limited to: Congregate Living
Congregate Living Health Facilities, Residential Health Facilities for the Terminally Ill and
Care Facilities for the Elderly, Group Homes and Residential Care Facilities for the Chronically Ill.
Residential Care Facilities for the Chronically Ill. Division 3 DWELLINGS [F or SFM] Dwellings
Division 2.1.1. [For SFM] Residentially - based, used for large family day-care homes (as
licensed facilities accommodating six or less defined in Chapter 2, Section 205) and lodging
nonambulatory clients. This division may include houses. L i c e n s i n g categories that may use
ambulatory clients. Licensing categories that this classification include, but are not limited to:
may use this classification include, but are not Adult Daycare Facilities, Family Day-care
limited to: Adult Residential Facilities, Homes, Adult Day-support Center, Day-care
Congregate Living Health Facilities, Foster Center for Mildly Ill Children, Infant Care Center
Family Homes, Intermediate Care Facilities for and School Age Child Day-care Center.
the Developmentally Disabled Habilitative, Congregate residences (each accommodating
Intermediate Care Facilities for the ten (10) persons or less).
Developmentally Disabled Nursing, nurseries for Division 6 OCCUPANCIES shall be residential
the full-time care of children under the age of group care facilities which provide care and/or
six, but not including "infants" as defined in supervisory services. Restraint shall not be
Section 210; Residential Care Facilities for the practiced in these facilities. Such residential
Elderly, Small Family Homes and Residential group care facilities are limited to halfway
Care Facilities for the Chronically Ill. houses such as community correctional centers,
Division 2.2. [For SFM] Residentially - based, community correction reentry centers,
licensed facilities accommodating more than six community treatment programs, work furlough
ambulatory clients. This division may include programs, and alcoholism or drug abuse
nonambulatory clients and shall not exceed six recovery or treatment f a c i l i t i e s .
nonambulatory clients. Licensing categories that Division 6.1 OCCUPANCIES are those Division
may use this classification include, but are 6 Occupancies with more than six
limited to: Adult Residential Facilities, nonambulatory residents.
Residential Care Facilities for the Elderly, Group Division 6.2 OCCUPANCIES are those Division
Homes, Community Treatment Facilities and 6 Occupancies with more than six ambulatory
Social Rehabilitation Facilities. residents
Division 2.2.1. [For SFM] Residentially -based, Division 6.1.1 OCCUPANCIES are those
licensed facilities accommodating six or less Division 6 Occupancies with six or less
ambulatory clients. This division may include a nonambulatory residents.
maximum of two nonambulatory clients. Division 6.2.1 OCCUPANCIES are those
Licensing categories that may use this Division 6 Occupancies with six or less
classification include, but are not limited to: Adult ambulatory residents.
Residential Facilities, Intermediate Care
Facilities for the Developmentally Disabled Group S Occupancies Group S Occupancies
Habilitative, Intermediate Care Facilities for the shall include the use of a building or structure, or
Developmentally Disabled Nursing, Nursing a portion thereof, for storage not classified as a
Homes, Residential Care Facilities for the hazardous occupancy.
Elderly, Foster Family Homes, Group Homes, Division 1. Moderate-hazard storage
Small Family Homes, Community Treatment occupancies shall include buildings or portions
Facilities and Social Rehabilitation Facilities. of buildings used for storage of combustible
Division 2.3. [For SFM] Residentially - based, materials that are not classified as Group S,
licensed facilities providing hospice care Division 2 or Group H Occupancies.
throughout accommodating more than six Division 2. Low-hazard storage occupancies
bedridden clients. Licensing categories that may shall include buildings, structures, or portions
use this classification are limited to: Congregate thereof, used for storage of noncombustible
Living Health Facilities for the Terminally Ill and materials such as products on wood pallets or in
Residential Care Facilities for the Chronically paper cartons with or without single-thickness
divisions, or in paper wrappings, and shall Building entrance is any operable doorway in
include ice plants, power plants and pumping or out of a building, including overhead doors.
plants. Building façade is the exterior surfaces of a
Division 3. Division 3 Occupancies shall include building, not including horizontal roofing, signs,
repair garages where work is limited to and surfaces not visible from any reasonable
exchange of parts and maintenance requiring no viewing location.
open flame or welding, motor vehicle fuel- Canopy is a permanent structure consisting of a
dispensing stations, and parking garages not roof and supporting building elements, with the
classed as Group S, Division 4 open parking area beneath at least partially open to the
garages or Group U private garages. elements. A canopy may be freestanding or
Division 4. Open parking garages. attached to surrounding structures. A canopy
Division 5. Aircraft hangars where work is roof may serve as the floor of a structure above.
limited to exchange of parts and maintenance Hardscape is an improvement to a site that is
requiring no open flame or welding, and paved and has other structural features,
helistops. including but not limited to, curbs, plazas,
entries, parking lots, site roadways, driveways,
Group U Occupancies walkways, sidewalks, bikeways, water features
Division 1. Private garages, carports, sheds and pools, storage or service yards, loading
and agricultural buildings. docks, amphitheaters, outdoor sales lots, and
Division 2. Fences over six feet (1829 mm) private monuments and statuary.
high, tanks and towers Landscape lighting is lighting that is recessed
into the ground or paving; mounted on the
OCCUPANT SENSOR, LIGHTING is a device ground; mounted less than 42” above grade; or
mounted onto trees or trellises, and that is
that automatically turns lights off soon after an
area is vacated. The term Occupant Sensor intended to be aimed only at landscape
applies to a device that controls interior lighting features.
Lantern is an ornamental outdoor luminaire that
systems, but can be used interchangeably with
uses an electric lamp to replicate a pre-electric
occupancy sensor, occupant sensing device,
lantern, which used a flame to generate light.
and motion sensor.
Lighting zone is a geographic area designated
by the California Energy Commission that
OIL INTERCEPTOR – See Interceptor. determines requirements for outdoor lighting,
including lighting power densities and specific
OPERABLE SHADING DEVICE is a device at control, equipment or performance
the interior or exterior of a building or integral requirements. Lighting zones are numbered
with a fenestration product, which is capable of LZ1, LZ2, LZ3, and LZ4. is a permanent lighting
being operated, either manually or automatically, system consisting of one or more rows of many
to adjust the amount of solar radiation admitted small lightsattached to a canopy.
to the interior of the building. ACM Joint Appendix I - Glossary
2005 Joint Appendices Page I-31
ORNAMENTAL CHANDELIERS are ceiling- Ornamental lighting is post-top luminaires,
mounted, close-to-ceiling, or suspended lanterns, pendant luminaires, chandeliers, and
decorative luminaires that use glass, crystal, marquee lighting.
ornamental metals, or other decorative material Outdoor lighting is all electrical lighting for
and that typically are used in hotel/motels, parking lots, signs, building entrances, outdoor
restaurants, or churches as a significant element sales areas, outdoor canopies, landscape
in the interior architecture. lighting, lighting for building facades and
ORNAMENTAL LIGHTING See Outdoor Outdoor sales frontage is the portion of the
Lighting perimeter of an outdoor sales area immediately
adjacent to a street, road, or public sidewalk.
OUTDOOR AIR is air taken from outdoors and Outdoor sales lot is an uncovered paved area
not previously circulated in the building. used exclusively for the display of vehicles,
equipment or other merchandise for sale. All
OUTDOOR LIGHTING definitions include the internal and adjacent access drives, walkway
following: areas, employee and customer parking
areas, vehicle service or storage areas are not PHOTOCONTROL is an electric control that
outdoor sales lot areas, but are considered detects changes in illumination then
hardscape. controls its electric load at predetermined
Parking lot is an uncovered area for the illumination levels.
purpose of parking vehicles. Parking lot is a type
of hardscape. P I P I N G is the pipe or tube mains for
Paved area is an area that is paved with interconnecting the various parts of a system.
concrete, asphalt, Piping includes pipe, tube, flanges, bolting,
stone, brick, gravel, or other improved wearing gaskets, valves, fittings, the pressure-containing
surface, including the curb. parts of other components such as expansion
Pendant is a mounting method in which the joints, strainers and devices which serve such
luminaire is suspended from above. purposes as mixing, separating, snubbing,
Post Top Luminaire is an ornamental outdoor distributing, metering or controlling flow, pipe
luminaire that is mounted directly on top of a supporting fixtures and structural attachments.
Principal viewing location is anywhere along
PLENUM is an air compartment or chamber
the adjacent highway, street, road or sidewalk
including uninhabited crawl spaces, areas above
running parallel to an outdoor sales frontage
a ceiling or below a floor, including air spaces
Public monuments are statuary, buildings,
below raised floors of computer/data processing
structures, and/or hardscape on public land. centers, or attic spaces, to which one or more
Sales canopy is a canopy specifically to cover
ducts are connected and which forms part of
and protect an outdoor sales area.
either the supply air, return air or exhaust air
Vehicle service station is a gasoline or diesel
system, other than the occupied space being
OUTSIDE AIR See Outdoor Air
P L U M B I N G – The business, trade, or work
OVERALL HEAT GAIN is the total heat gain having to do with the installation, removal,
through all portions of the building envelope alteration, or repair of plumbing systems or parts
calculated as specified in Section 143 (b) 2 for thereof.
determining compliance with the Overall
Envelope Approach. PLUMBING APPLIANCE – Any one of a special
class of device or equipment which is intended
OVERALL HEAT LOSS is the total heat loss to perform a special plumbing function. Its
through all portions of the building envelope operation and/or control may be dependent
calculated as specified in Section 143 (b) 1 for upon one or more energized components, such
determining compliance with the Overall as motors, controls, heating elements, or
Envelope Approach. pressure or temperature-sensing elements.
Such device or equipment may operate
PACKAGED AIR CONDITIONER OR HEAT automatically through one or more of the
PUMP is an air conditioner or heat pump that following actions: a time cycle, a temperature
combines both the condenser and air handling range, a pressure
capabilities in a single enclosure or package. range, a measured volume or weight; or the
device or equipment may be manually adjusted
PERSONAL SERVICE ROOM [For DSA/SS] – or controlled by the user or operator.
A room which is not directly connected with the
production or service function performed by the PLUMBING APPURTENANCE – A
establishment. Such manufactured device, or a prefabricated
rooms may include, but are not limited to, first assembly, or an on-the-job assembly
aid or medical rooms, toilet rooms, change of component parts, and which is an adjunct to
rooms, wash rooms, shower rooms, kitchens the basic piping system and plumbing fixtures.
and lunch rooms. An appurtenance demands no additional water
supply, nor does it add any discharge load to a
fixture or the drainage system. It performs some
PEX. Cross-linked Polyethylene.
useful function in the operation, maintenance,
servicing, economy, or safety of the plumbing without the use of ducts and can be readily
system. transported from place to place without
dismantling any portion thereof.
PLUMBING CODE [Not adopted by HCD] is the
Uniform Plumbing Code promulgated by the PORTABLE HEATING APPLIANCE is a
International Association of Plumbing and heating appliance designed for environmental
Mechanical Officials as adopted by this heating which may have a self-contained fuel
jurisdiction. Exception: [For HCD 1 & 2] supply and is not secured or attached to a
Whenever the term “Plumbing Code” is used in building by any means other than by a factory-
this code, it shall mean the California Plumbing installed power supply cord.
Code, Title 24, Part 6.
PORTABLE VENTILATING EQUIPMENT is
PLUMBING FIXTURE – An approved type ventilating equipment that can be readily
installed receptacle, device, or appliance which transported from place to place without
is supplied with water or which receives liquid or dismantling a portion thereof and which is not
liquid-borne wastes and discharges such wastes connected to a duct.
into the drainage system to which it may be
directly or indirectly connected. Industrial or POSITIVE DISPLACEMENT COMPRESSOR is
commercial tanks, vats, and similar processing a compressor in which increase in pressure is
equipment are not plumbing fixtures, but may be attained by changing the internal volume of the
connected to or discharged into approved traps compression chamber.
or plumbing fixtures when and as otherwise
provided for elsewhere in this Code. POTABLE WATER – Water which is
satisfactory for drinking, culinary, and domestic
PLUMBING SYSTEM – Includes all potable
purposes and meets the requirements of the
water building supply and distribution pipes, all
health authority having jurisdiction.
plumbing fixtures and traps, all drainage and
vent pipe(s), and all building drains and building
sewers, including their respective joints and POWER BOILER PLANT. One or more power
connection, devices, receptors, and steam boilers or power hot water boilers and
appurtenances within the property connecting piping and vessels within the same
lines of the premises and shall include potable premises.
water piping, potable water treating or using
equipment, medical gas and medical vacuum P R E S S U R E – The normal force exerted by
systems, fuel gas piping, water heaters and a homogeneous liquid or gas, per unit of area,
vents for same. on the wall of the container.
(1) Static Pressure – The pressure existing
POLLUTION – An impairment of the quality of without any flow.
the potable water to a degree which does not (2) Residual Pressure – The pressure available
create a hazard to the public health but which at the fixture or water outlet after allowance is
does adversely and unreasonably affect the made for pressure drop due to friction loss,
aesthetic qualities of such potable waters for head, meter, and other losses in the system
domestic use. Also defined as Low Hazard. during maximum demand periods.
PORTABLE COOLING UNIT is a self-contained PRESSURE BALANCING VALVE – A mixing
refrigerating system, not over three horsepower valve which senses incoming hot and cold water
rating, which has been factory-assembled and pressures and compensates for fluctuations in
tested, installed without supply a i r ducts and either, to stabilize outlet temperature.
without connecting any refrigerant-containing
parts. This definition shall not include an PRESSURE, DESIGN is the maximum working
absorption unit. pressure for which a specific part of a
refrigeration system is designed.
PORTABLE EVAPORATIVE COOLER is an
evaporative cooler which discharges the PRIVATE SEWAGE DISPOSAL SYSTEM – A
conditioned air directly into the conditioned area septic tank with the effluent discharging into a
subsurface disposal field, into one or more percentage of heat from combustion of gas or oil
seepage pits or into a combination of subsurface which is transferred to the water. For non-
disposal field and seepage pit or of such other storage type water heaters, the recovery
facilities as may be permitted under the efficiency is really a thermal efficiency.
procedures set forth elsewhere in this Code.
REDUCED FLICKER OPERATION is the
PRIVATE SEWER – A building sewer which operation of a light, in which the light has a
receives the discharge from more than one (1) visual flicker less than 30% for frequency and
building drain and conveys it to a public sewer, modulation.
private sewage disposal system, or other point
of disposal. REFLECTANCE, SOLAR is the ratio of the
reflected solar flux to the incident solar flux.
PROCESS LOAD is a load resulting from a
process. REFRIGERANT CHARGE is to the amount of
refrigerant that is installed or “charged” into
PUBLIC SEWER – A common sewer directly an air conditioner or heat pump. The refrigerant
controlled by public authority. is the working fluid. It is compressed and
becomes a liquid as it enters the condenser. The
RADIANT BARRIER is a highly reflective, low hot liquid is cooled in the condenser and flows
emitting material installed at the underside to the evaporator where it released through the
surface of the roof deck and the inside surface expansion valve. When the pressure is released,
of gable ends or other exterior vertical surfaces the refrigerant expands into a gas and cools. Air
in attics to reduce solar heat gain into the attic, is passed over the evaporator to provide the
as specified by Section 151(f)2. space cooling. When an air conditioner or heat
pump has too much refrigerant (overcharged)
RADIANT HEATER is a heater designed to the compressor may be damaged. When an air
transfer heat primarily by direct radiation conditioner has too little refrigerant
(undercharged), the efficiency of the unit is
RAISED FLOOR is a floor (partition) over a reduced. A thermostatic expansion valve (TXV)
can mitigate the impact of improper refrigerant
crawl space, or an unconditioned space, or
ambient air. charge. heat primarily by direct radiation.
RECEPTOR – An approved plumbing fixture or REFRIGERATION MACHINERY ROOM is a
device of such material, shape, and capacity as space that is designed to safely house
to adequately receive the discharge from indirect compressors and pressure vessels.
waste pipes, so constructed and located as to
be readily cleaned. REFRIGERATION SYSTEM, ABSORPTION is
a heat-operated closed-refrigeration cycle in
RECOOL is the cooling of air that has been which a secondary fluid, the absorbent, absorbs
previously heated by space conditioning a primary fluid, the refrigerant that has been
equipment or systems serving the same vaporized in the evaporator.
REFRIGERATION SYSTEM, MECHANICAL is
RECOVERED ENERGY is energy used in a a combination of interconnected refrigerant
building that (1) is mechanically recovered containing parts constituting one closed
from space conditioning, service water heating, refrigerant circuit in which a refrigerant is
lighting, or process equipment after the energy circulated for the purpose of extracting heat and
has performed its original function; (2) provides in which a compressor is used for compressing
space conditioning, service water heating, or the refrigerant vapor.
lighting; and (3) would otherwise be wasted.
REFRIGERATION SYSTEM, SELF
RECOVERY EFFICIENCY is one measure of CONTAINED is a complete factory-assembled
the efficiency of water heaters. It is required and tested system that is shipped in one or more
for water heating energy calculations for some
sections and has no refrigerant-containing parts
types of water heaters. It is a measure of the
that are joined in the field by other than ROOM HEATER is a freestanding,
companion or block valves. nonrecessed, environmental heating appliance
installed in the space being heated and not
REFRIGERATION ROOM or SPACE is a room connected to ducts.
or space in which an evaporator or brine coil is
located for the purpose of reducing or controlling ROUGHING - IN – The installation of all parts of
the temperature within the room or space to the plumbing system which can be completed
below 68°F (20°C). prior to the installation of fixtures. This includes
drainage, water supply, gas piping, and vent
REGULATING EQUIPMENT – Includes all piping and the necessary fixture supports.
valves and controls used in a plumbing system
which are required to be accessible or readily RUNOUT is piping that is no more than 12 feet
accessible. long and that is connected to a fixture or an
individual terminal unit.
REHEAT is the heating of air that has been
previously cooled by cooling equipment or R-VALUE is the measure of the thermal
systems or an economizer. resistance of insulation or any material or
building component expressed in ft²-hr ºF/Btu.
RELATIVE SOLAR HEAT GAIN is the ratio of See Thermal Resistance
solar heat gain through a fenestration product
(corrected for external shading) to the incident SAND INTERCEPTOR – See Interceptor.
solar radiation. Solar heat gain includes directly
transmitted solar heat and absorbed solar SEASONAL ENERGY EFFICIENCY RATIO
radiation, which is then reradiated, conducted, (SEER) is the total cooling output of a central air
or convected into the space. conditioner in Btu during its normal usage period
for cooling divided by the total electrical energy
RELIEF VENT – A vent, the primary function of input in watt-hours during the same period, as
which is to provide circulation of air between determined using the applicable test method in
drainage and vent systems or to act as an the Appliance Efficiency Regulations.
auxiliary vent on a specially designed system.
SEEPAGE PIT – A lined excavation in the
RESIDENTIAL BUILDING See High-Rise ground which receives the discharge of a septic
Residential Building and Low-Rise Residential tank so designed as to permit the effluent from
Building. the septic tank to seep through its bottom and
RESIDENTIAL MANUAL is the manual
developed by the Commission, under Section SEPTIC TANK – A watertight receptacle which
25402.1 of the Public Resources Code, to aid receives the discharge of a drainage system or
designers, builders, and contractors in meeting part thereof, designed and constructed so as to
energy efficiency standards for low-rise retain solids, digest organic matter through a
residential buildings. period of detention and allow the liquids to
discharge into the soil outside of the tank
R I S E R – A water supply pipe which extends through a system of open joint piping or a
vertically one (1) full story or more to convey seepage pit meeting the requirements of this
water to branches or fixtures. Code.
SERIES FAN-POWERED TERMINAL UNIT is a
RISER HEAT PIPE is a duct which extends at
an angle of more than forty-five (45) degrees terminal unit that combines a VAV damper in
series with a downstream fan which runs at all
(0.79 rad) from the horizontal. This definition
times that the terminal unit is supplying air to the
shall not include any boot connection.
ROOF DR A I N – A drain installed to receive SERVICE WATER HEATING is heating of water
water collecting on the surface of a roof and to for sanitary purposes for human occupancy,
discharge it into a leader, downspout, or other than for comfort heating.
SEWAGE – Any liquid waste containing animal SMACNA is the Sheet Metal and Air
or vegetable matter in suspension or solution conditioning Contractors National
and may include liquids containing chemicals in Association.
SMOKE DETECTOR is an approved device that
SEWAGE EJECTOR – A device for lifting senses visible or invisible particles of
sewage by entraining it in a high-velocity jet of combustion.
steam, air or water.
STATE BUILDING CODE [For OSHPD 1, 2, 3 &
SEWAGE PU M P – A permanently installed
4] is the most recent edition of the California
mechanical device, other than an ejector, for
removing sewage or liquid waste from a sump
SHADING COEFFICIENT (SC) is the ratio of the SOIL PIPE – Any pipe which conveys the
solar heat gain through a fenestration product discharge of water closets, urinals, clinic sinks or
to the solar heat gain through an unshaded 1/8 fixtures having similar functions of collection and
inch thick clear double strength glass under the removal of domestic sewage, with or without the
same set of conditions. For nonresidential, high- discharge from other fixtures to the building
rise residential, and hotel/motel buildings, drain or building sewer.
this shall exclude the effects of mullions, frames,
sashes, and interior and exterior shading SOLAR HEAT GAIN COEFFICIENT (SHGC) is
devices. See also Solar Heat Gain Coefficient. the ratio of the solar heat gain entering the
space through the fenestration area to the
SHIELDED COUPLING – An approved incident solar radiation. Solar heat gain includes
elastomeric sealing gasket with an approved directly transmitted solar heat and absorbed
outer shield and a tightening mechanism. solar radiation, which is then reradiated,
conducted, or convected into the space.
SHOCK ARRESTOR – See Water Hammer
Arrestor. SOLAR REFLECTANCE See Reflectance.
SIDE FINS are vertical shading elements SPACE CONDITIONING SYSTEM is a system
mounted on either side of a glazed opening that that provides either collectively or individually
can protect the glazing from lateral low heating, ventilating, or cooling within or
angle sun penetration. associated with conditioned spaces in a building.
The system may operate alone or in conjunction
SITE SOLAR ENERGY is natural daylighting, or with other systems. See Heating, Ventilating and
thermal, chemical, or electrical energy derived Air Conditioning.
from direct conversion of incident solar radiation
at the building site. SPECIAL WASTES – Wastes which require
some special method of handling such as the
SITE-BUILT FENESTRATION is fenestration use of indirect waste piping and receptors,
designed to be field-glazed or field assembled corrosion resistant piping, sand, oil or grease
units using specific factory cut or otherwise interceptors, condensers, or other pretreatment
factory formed framing and glazing units that are facilities.
manufactured with the intention of being
assembled at the construction site and are SPECIALTY EVENT CENTERS [For DSA/AC] –
provided with an NFRC label certificate for site- An open arena used for rallies, concerts,
built fenestration. Examples of site-built exhibits, etc., with no permanent structure for
fenestration include storefront systems, curtain purpose of assembly.
walls, and atrium roof systems.
SPECIFIC HEAT is the quantity of heat that
SINGLE FAMILY DWELLING [Not adopted by must be added to a unit mass of a
HCD] – A building designed to be used as a material to increase its temperature by one
home by the owner of such building, which shall degree. Typical units are Btu/ºF-lb.
be the only dwelling located on a parcel of
ground with the usual accessory buildings.
SPLIT SYSTEM AIR CONDITIONER OR sewage or liquid waste and which is located
HEAT PUMP is an air conditioner or heat pump below the normal grade of the gravity system
that has physically separate condenser and air and which must be emptied by mechanical
handling units that work together as a single means.
SUSPENDED FILMS are low-e coated plastic
STACK VENT – The extension of a soil or waste films stretched between the elements
stack above the highest horizontal drain of the spacers between panes of glazing; acts
connected to the stack. as a reflector to slow the loss of heat from the
interior to the exterior.
STANDBY LOSS, BTU/HR is the heat lost per
hour from the stored water above room TAILPIECE – The pipe or tubing that connects
temperature. It is one of the measures of the outlet of a plumbing fixture to a trap.
efficiency of water heaters required for water
heating energy calculations for some TDV ENERGY See Time Dependent Valuation
types of water heaters. This standby loss is (TDV) Energy.
expressed as Btu/hr.
THERMAL BREAK WINDOW FRAME is metal
STANDBY LOSS, PERCENT is the ratio of heat fenestration frames that are not solid metal from
lost per hour to the heat content of the stored the inside to the outside, but are separated in
water above room temperature. It is one of the the middle by a material, usually urethane, with
measures of efficiency of water heaters required a lower conductivity.
for water heating energy calculations for some
types of water heaters. Standby loss is THERMAL CONDUCTIVITY is the quantity of
expressed as a percentage. heat that will flow through a unit area of the
material per hour when the temperature
STEPPED DIMMING is a lighting control method difference through the material is one degree.
that varies the light output of lamps in one or
more predetermined discrete steps between full THERMAL EMITTANCE See Emittance.
light output and off.
THERMAL MASS is solid or liquid material used
STEPPED SWITCHING is a lighting control to store heat for later heating use or for reducing
method that varies the light output of a cooling requirements.
lighting system with the intent of maintaining
approximately the relative uniformity of THERMAL RESISTANCE (R) is the resistance
illumination by turning off alternate groups of a material or building component to the
of lamps or luminaires. passage of heat in (hr. x ft.² x ºF)/Btu.
STORM DRAIN – See Building Drain (Storm). THERMOSTATIC EXPANSION VALVE
(TXV) is a refrigerant metering valve, installed in
STORM SE W E R – A sewer used for an air conditioner or heat pump, which controls
conveying rainwater, surface water, condensate, the flow of liquid refrigerant entering the
cooling water, or similar liquid wastes. evaporator in response to the superheat of the
gas leaving it.
SUBSOIL DRAIN – A drain which collects
subsurface or seepage water and conveys it to a THERMOSTATIC VALVE – A mixing valve
place of disposal. which senses outlet temperature and
compensates for fluctuations in incoming hot or
SUCTION LINE is the refrigerant line that leads cold water temperatures.
from the evaporator to the condenser in a split
system air conditioner or heat pump. This TOILET ROOM [For DSA/AC] – A room within
line is insulated since it carries refrigerant at a or on the premises containing water closets,
low temperature. urinals and other required facilities.
SUMP – An approved tank or pit which receives
THROW DISTANCE is the distance between the Uniform Mechanical Code published by the
luminaire and the center of the plane lit by the International Association of Plumbing and
luminaire on a display. Mechanical Officials.
TIME DEPENDENT VALUATION (TDV) UNCONDITIONED SPACE is enclosed space
ENERGY is the time varying energy caused to within a building that is not directly conditioned
be used at by the building to provide space or indirectly conditioned.
conditioning and water heating and for specified
buildings lighting, accounting for the energy UNCONFINED SPACE is a room or space
used at the building site and consumed in
having a volume equal to at least fifty (50) cubic
producing and in delivering energy to a site,
feet (1.42 m3) per 1000 Btu/h (0.293 kW) of the
including, but not limited to, power generation,
aggregate input rating of all fuel-burning
transmission and distribution losses.
appliances installed in that space. Rooms
communicating directly with the space in which
TITLE 24 is all of the building standards and
the appliances are installed, through openings
associated administrative regulations published
not furnished with doors, are considered a part
in Title 24 of the California Code of Regulations.
of the unconfined space.
The Building Energy Efficiency Standards are
contained in Part 6. Part 1 contains the
administrative regulations for the building UNIT HEATER is a heating appliance designed
standards. for nonresidential space heating and equipped
with an integral means for circulation of air.
TRAP – A fitting or device so designed and
constructed as to provide, when properly vented, UNIT INTERIOR MASS CAPACITY (UIMC) is
a liquid seal which will prevent the back passage the amount of effective heat capacity per unit of
of air without materially affecting the flow of thermal mass, taking into account the type of
sewage or waste water through it. mass material, thickness, specific heat, density
and surface area. See also Thermal Mass.
TRAP ARM – That portion of a fixture drain
between a trap and the vent. UNSANITARY (Insanitary) – See Insanitary.
TRAP PRIMER – A device and system of piping
that maintains a water seal in a remote trap.
UNUSUALLY TIGHT CONSTRUCTION is
TRAP SEAL – The vertical distance between construction where:
the crown weir and the top dip of the trap. 1. Walls and ceilings exposed to the outside
atmosphere have a continuous water vapor
CROWN WEIR (Trap Weir) –the lowest point in retarder with a rating of one perm or less with
the cross section of the horizontal waterway at any openings gasketed or sealed;
the exit of the trap. 2. Weatherstripping is on openable windows and
TOP DIP (of Trap ) – the highest point in the 3. Caulking or sealants are applied to areas
internal cross section of the trap at the lowest such as joints around window and door frames,
part of the bend (inverted siphon). By contrast, between sole plates and floors, between wall-
the bottom dip is the lowest point in the internal ceiling joints, between wall panels and at
cross section. penetrations for plumbing, electrical and gas
lines and at other openings.
U-FACTOR is the overall coefficient of thermal
transmittance of a construction assembly, in
U.P.C. [For HCD 1 & HCD 2, DSA/AC, SFM,
Btu/(hr. x ft.² x ºF), including air film
DHS, DSA/SS, OSHPD 1, 2, 3 & 4] – The latest
resistance at both surfaces.
edition of the Uniform Plumbing Code, published
by the International Association of Plumbing and
U-VALUE See U-factor.
UMC [For HCD 1 & 2, SFM, DSA/SS, OSHPD 1,
2, 3 & 4] is the most recent edition of the
VACUUM BREAKER – See Backflow VENTED APPLIANCE CATEGORIES
Preventer. Category I is an appliance which operates with
a non-positive vent static pressure and with a
VACUUM RELIEF VA L V E – A device that vent gas temperature that avoids excessive
prevents excessive vacuum in a pressure condensate production in the vent.
vessel. Category II is an appliance which operates with
a non-positive vent static pressure and with a
VAPOR BARRIER is a material that has a vent gas temperature that may cause excessive
permeance of one perm or less and that condensate production in the vent.
provides resistance to the transmission of water Category III is an appliance which operates with
vapor. a positive vent static pressure and with a vent
gas temperature that avoids excessive
VARIABLE AIR VOLUME (VAV) SYSTEM is a condensate production in the vent.
space conditioning system that maintains Category IV is an appliance which operates with
comfort levels by varying the volume of a positive vent static pressure and with a vent
conditioned air to the zones served. gas temperature that may cause excessive
condensate production in the vent.
VENT – Any pipe provided to ventilate a
plumbing system, to prevent trap siphonage and VENTED DECORATIVE APPLIANCE is a
back pressure, or to equalize the air pressure vented appliance whose only function is
within the drainage system. providing an esthetic effect of flames.
Type B Gas Vent is a factory-made gas vent
listed by a nationally recognized testing agency VENTED WALL FURNACE is a vented
for venting listed or approved appliances
environmental heating appliance designed for
equipped to burn only gas. incorporation in, or permanent attachment to, a
Type BW Gas Vent is a factory-made gas vent
wall, floor, ceiling or partition and arranged to
listed by a nationally recognized testing agency
furnish heated air by gravity or by a fan. This
for venting listed or approved gas-fired vented
definition shall not include floor furnaces, unit
heaters and room heaters.
Type L is a venting system consisting of listed
vent piping and fittings for use with oil-burning
appliances listed for use with Type L or with VENTILATING CEILING is a suspended ceiling
listed gas appliances. containing many small apertures through which
air, at low pressure, is forced downward from an
overhead plenum dimensioned by the concealed
VENT CONNECTOR, GAS is that portion of a
gas-venting system which connects a listed gas
appliance to a gas vent and is installed within space between the suspended ceiling and the
the space or area in which the appliance is floor or roof above.
VENTILATION AIR is that portion of supply air
VENT PIPE – See Vent. which comes from outside plus any
recirculated air that has been treated to maintain
VENT STACK – The vertical vent pipe installed the desired quality of air within a designated
primarily for the purpose of providing circulation space. See also Outside Air.
of air to and from any part of the drainage
system. VENTILATION SYSTEM is all of that equipment
intended or installed for the purpose of supplying
VENT SYSTEM – A pipe or pipes installed to air to, or removing air from, any room or space
provide a flow of air to or from a drainage by mechanical means, other than equipment
system or to provide a circulation of air within which is a portion of an environmental heating,
such system to protect trap seals from cooling, absorption or evaporative cooling
siphonage and back- pressure. system.
VENTING SYSTEM is the vent or chimney and
its connectors, assembled to form a continuous
open passageway from an appliance to the water supply so as to change its chemical
outside atmosphere for the purpose of removing content or remove suspended solids by filtration.
products of combustion. This definition also shall
include a venting assembly which is an integral WATER-DISTRIBUTING PIPE – In a building or
part of an appliance. premises, a pipe which conveys potable water
from the building supply pipe to the plumbing
VENTING SYSTEM—GRAVITY-TYPE is a fixtures and other water outlets.
system which depends entirely on the heat from
the fuel being used to provide the energy WATER HAMMER ARRESTOR – A device to
required to vent an appliance. absorb hydraulic shock, either of the air
chamber or mechanical device design.
VENTING SYSTEM—POWER-TYPE is a
system which depends on a mechanical device WATER HEATER or HOT WATER-HEATING
to provide a positive draft within the venting BOILER is an appliance designed primarily to
system. supply hot water and is equipped with automatic
controls limiting water temperature to a
VERTICAL PIPE – Any pipe or fitting which is maximum of 210°F (99°C).
installed in a vertical position or which makes an
angle of not more than forty-five (45) degrees WATER MAIN (STREET MAIN) – A water-
with the vertical. supply pipe for public or community use.
VINYL WINDOW FRAME is a fenestration WATER SUPPLY SYSTEM – The building
frame constructed with a polyvinyl chloride supply pipe, the water distributing pipes and the
(PVC) which has a lower conductivity than metal necessary connecting pipes, fittings, control
and a similar conductivity to wood. valves, backflow prevention devices and all
appurtenances carrying or supplying potable
VISIBLE LIGHT TRANSMITTANCE (VLT) is the water in or adjacent to the building or premises.
ratio (expressed as a decimal) of visible light
that is transmitted through a glazing material to WET VENT – A vent which also serves as a
the light that strikes the material. drain.
WHIRLPOOL BA T H T U B – A bathtub fixture
WALL HEATER. See VENTED WALL
equipped and fitted with a circulating piping
system designed to accept, circulate and
discharge bathtub water upon each use.
WALL-HUNG WATER CLOSET – A water
closet installed in such a way that no part of the WINDOW is fenestration that is not a skylight.
water closet touches the floor.
WINDOW WALL RATIO is the ratio of the
WARM AIR FURNACE is an environmental window area to the gross exterior wall area.
heating appliance designed or arranged to
discharge heated air through any duct or ducts. YOKE VENT – A pipe connecting upward from a
This definition shall not include a unit heater. soil or waste stack to a vent stack for the
purpose of preventing pressure changes in the
WASTE PIPE – A pipe which conveys only stacks.
liquid waste, free of fecal matter.
ZONAL CONTROL is the practice of dividing a
WATER CLOSET [For HCD 1 & HCD 2, residence into separately controlled HVAC
DSA/AC] – A plumbing fixture (which may be zones. This may be done by installing multiple
used for both defecation or urination) in which HVAC systems that condition a specific part of
the waste matter is removed by flushing with the building, or by installing one HVAC system
water. with a specially designed distribution system that
permits zonal control. The Energy Commission
WATER CONDITIONING OR TREATING has approved an alternative calculation method
DEVICE – A device which conditions or treats a for analyzing the energy impact of zonally
controlled space heating and cooling systems.
To qualify for compliance credit for zonal control,
specific eligibility criteria specified in the
Residential ACM Manual must be met.
ZONE, SPACE CONDITIONING is a space or
group of spaces within a building with sufficiently
similar comfort conditioning requirements so that
comfort conditions, as specified in Section 144
(b) 3 or 150 (h), as applicable, can be
maintained throughout the zone by a single
controlling device for each zone.
California Building Standards Commission, 2001
California Plumbing Code
California Building Standards Commission, 2001
California Mechanical Code
California Energy Commission, 2005 Energy
Efficiency Standards for Residential and