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					UWA FM Planning and Design Section



APPENDIX TO SECTION D.

D2       AIR FILTRATION SYSTEMS

For general air-conditioning applications, extended surface pocket type air filters
are required to be incorporated wherever possible with 660 deep pockets for
maximum dust retention and minimal service frequency.

Filter media shall be Type 1, Class A NATA certified to meet the requirements
of AS 1324 performance rating F6 table 2.1. With a minimum initial efficiency of
61% on No 1 dust and 96% on No 4 dust. With a maximum dust holding
capacity of 704g No 4 dust, per 610 x 610 x 660 deep module and an initial
clean resistance of 45Pa and a final resistance of 250Pa.

300 deep pocket filters will only be accepted where 660 deep pockets cannot be
accommodated due to space restrictions.

Extended surface pleated box filters will only be accepted where pocket filters
cannot be accommodated due to space restrictions.

Flat Panel Filters will only be accepted on Console Type Room Fan Coil Units
and Room Air Conditioning Units where extended surface filters cannot be
accommodated due to space restrictions.

Filters to be selected for initial clean resistance less than 50Pa. and a final,
renew, resistance of 250Pa. Clean filter banks with a pressure drop greater than
50Pa will not be accepted. The exception being Heppa Filters. Each filter bank
is to be equipped with a Differential Pressure Switch that will be connected to
the BMCS. MAGNEHELIC GAUGES WILL NO LONGER BE ACCEPTED.

Pressure sensing lines to the Differential Pressure Switch shall be hard drawn
copper tube connected to the ducting or the FCU panel with approved bulkhead
fittings. Connection to the Differential Pressure Switch shall be with 50mm clear
flexible plastic tube .PVC clear plastic tube, soft drawn aluminium or copper
tube will not be accepted.

Where a differential pressure switch is provided for the BMCS, common
pressure tapping points with the gauge are to be utilised.

Filter bank holding frames shall be sized to accommodate standard 610 x 610
module media supporting frames, be self supporting with all filter modules
removed, and be designed to deflect less than 1/500th of the total width/depth in
operation at 250 Pa, differential pressure.

Adhesive tapes or sealants should not be used to seal removable modules to
support frames.

Filters for special applications – Kitchen Hood Grease Filters; High Efficiency
Filters for Clean Rooms; HEPA Filters; Electrostatic Filters; Activated Carbon


Project Management & Design Guidelines Manual                              Edition September 2003
Section D: Mechanical Services Guidelines - Appendix D2 - Air Filtration
UWA FM Planning and Design Section



Filters etc. – must comply with AS1324 and be certified by NATA independent
test data.




Project Management & Design Guidelines Manual                              Edition September 2003
Section D: Mechanical Services Guidelines - Appendix D2 - Air Filtration

				
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