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 6610-01-261-1781
NSN 5920-01-040-7717
NSN 5999-00-577-2943
NSN 5920-01-167-8908
NSN 5920-00-571-3859
NSN 6685-00-255-5109
NSN 5945-01-153-7624
NSN 6645-00-470-5310
NSN 6610-00-402-6856
NSN 5960-00-644-4982
NSN 5965-01-435-3414
NSN 6130-01-307-0926