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 5945-01-176-3600
NSN 6685-00-188-1991
NSN 5925-00-126-6660
NSN 5960-00-009-4381
NSN 5920-01-384-2633
NSN 6645-01-240-5499
NSN 5999-01-520-8327
NSN 6320-00-174-1362
NSN 6685-00-663-9000
NSN 5998-01-020-7274
NSN 6685-01-597-2730
NSN 6645-00-445-8143