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 5999-01-105-8572
NSN 4140-01-412-3933
NSN 2925-01-502-5896
NSN 6645-01-559-3008
NSN 5910-01-599-8473
NSN 6610-01-126-5616
NSN 6685-00-679-9965
NSN 6110-01-415-3542
NSN 4140-01-492-5268
NSN 6130-01-376-4829
NSN 5935-01-051-3849
NSN 5965-01-104-5102