F-F-1962
March 1, 1978
FEDERAL SPECIFICATION
FILTER, AIR EXTENDED MEDIA AREA TYPE,
FOR USE IN AIR DISTRIBUTION SYSTEM
This specification was approved by the Commissioner, Federal Supply
Service, General Services Administration, for the use of all Federal
agencies.
1. SCOPE AND CLASSIFICATION
1.1 Scope. This specification covers factory assembled air filters of the
extended media area type with externally supported, non-supported, or self-
supporting cartridges installed in permanent corrosion resistant metal holding
frames or housings for removal or particulate matter in air conditioning, heating
and ventilating systems.
1.2 Classification. All filters shall be UL approved, class 2 conforming to
UL 900. Filters shall be of the following type cartridges and media grades (see
6.2).
1.2.1 Cartridges:
Type I - Prefilter - Externally supported or non-supported cartridge
(bag type).
Type II - Afterfilter - Externally supported or non-supported
cartridge, (bag type).
1.2.2 Media.
Grade A - 95 percent rated efficiency (ASHRAE Std. 52-76 using
atmospheric dust).
Grade B - 85 percent rated efficiency (ASHRAE Std. 52-76 using
atmospheric dust).
Grade C - 40 percent rated efficiency (ASHRAE Std. 52-76 using
atmospheric dust).
Grade D - 30 percent rated efficiency (ASHRAE Std. 52-76 using
atmospheric dust).
2. APPLICABLE DOCUMENTS
2.1 The following documents, of the issue in effect on date of invitation
for bids or request for proposal, form a part of this specification to the extent
specified herein.
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