A-A-1419D, COMMERCIAL ITEM DESCRIPTION: FILTER ELEMENT, AIR CONDITIONING (VISCOUS-IMPINGEMENT AND DRY TYPES, REPLACEABLE) (18-JUN-1981) [REPLACED BY ANSI/ASHREA 52.1 AND UL900]

A-A-1419D, COMMERCIAL ITEM DESCRIPTION: FILTER ELEMENT, AIR CONDITIONING (VISCOUS-IMPINGEMENT AND DRY TYPES, REPLACEABLE) (18-JUN-1981) [REPLACED BY ANSI/ASHREA 52.1 AND UL900]., This commercial item description covers standard dust-holding capacity, flat panel-type air-conditioning filters designed for arresting particulate matter in heating and ventilation systems in which the face valocity of the air stream approximately 300 feet per minute (fpm).