GGG-M-125-10A, FEDERAL SPECIFICATION, RESPIRATOR ASSEMBLY: HELMET WITH POWERED AIR-PURIFYING UNIT (20 SEP 1982)

GGG-M-125-10A, FEDERAL SPECIFICATION, RESPIRATOR ASSEMBLY: HELMET WITH POWERED AIR-PURIFYING UNIT (20 SEP 1982)., This specification covers the specific requirements for a powered air-purifying respirator assembly, designed to deliver to the wearer a supply of positive pressure air having particulate matter no greater than 0.3 microns in diameter.