MIL-H-22594A, MILITARY SPECIFICATION: HEATERS, DUCT TYPE, ELECTRIC (15-APR-1977) [S/S BY MIL-PRF-22594B]

MIL-H-22594A, MILITARY SPECIFICATION: HEATERS, DUCT TYPE, ELECTRIC (15-APR-1977) [S/S BY MIL-PRF-22594B]., This specification covers electric, duct type heaters used in heating, ventilating, and air conditioning systems.