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* INCH-POUND *
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F-F-2790
November 27, 1991
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SUPERSEDING
MIL-F-29177A
8 March 1985
FEDERAL SPECIFICATION
FILTER, AIR-EXTENDED AREA, INITIAL INSTALLATION
This specification is approved by the Commissioner, Federal
Supply Service, General Services Administration, for the use
of all Federal agencies.
1. SCOPE
1.1 Scope. This specification covers replaceable, extended media area
type air filters with externally supported, nonsupported, or self-supporting
cartridges installed in permanent metal holding frames and housings as
required for use in air conditioning, heating, and ventilating systems.
1.2 Classification. Filters covered by this specification shall be of the
following types and grades, as specified (see 6.2).
Type I - Prefilter - Externally supported or nonsupported cartridge
Grade A - 30 percent commercially rated efficiency
Grade B - 40 percent commercially rated efficiency
Type II - Afterfilter - Externally supported or nonsupported cartridge
Grade C - 85 percent commercially rated efficiency (minimum of
58 percent per ASHRAE 52 using atmospheric dust)
Grade D - 95 percent commercially rated efficiency (minimum of
78 percent per ASHRAE 52 using atmospheric dust)
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*Beneficial comments (recommendations, additions, deletions) and any pertinent*
*data which may be of use in improving this document should be addressed to: *
*Commanding Officer (Code 156), Naval Construction Battalion Center, Port *
*Hueneme, CA 93043-5000, by using the self-addressed Standardization *
*Document Improvement Proposal (DD Form 1426) appearing at the end of this *
*document or by letter. *
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FSC 4130
DISTRIBUTION STATEMENT A. Approved for public release; distribution is
unlimited.
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