A-A-50554, COMMERCIAL ITEM DESCRIPTION: FILTER, AIR-EXTENDED AREA, INITIAL INSTALLATION (09-OCT-1997) [SUPERSEDING F-F-2790]

A-A-50554, COMMERCIAL ITEM DESCRIPTION: FILTER, AIR-EXTENDED AREA, INITIAL INSTALLATION (09-OCT-1997) [SUPERSEDING F-F-2790]., This specification covers replaceable, extended media area type air filters with externally supported, nonsupported, or self-supporting cartridges. The filters are installed in permanent metal holding frames and housings as required for use in air conditioning, heating, and ventilating systems for removing particulate matter found in the atmosphere.