An item consisting of a metal frame in which is inserted a flat metal plate mounted on a shaft. The plate, fluctuating automatically according to changes in atmospheric pressure, controls the stack or flue draft and maintains an absolute constancy of draft regardless of varying weather conditions.
NSN 5910-01-288-0142
NSN 2925-01-329-3665
NSN 6105-00-142-5901
NSN 6645-01-396-6976
NSN 5935-01-464-3729
NSN 5960-01-235-7032
NSN 5895-00-233-7309
NSN 6105-01-445-3081
NSN 7035-01-593-5307
NSN 5895-01-534-6124
NSN 5990-00-130-7293
NSN 5910-01-426-3922