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 5935-01-457-1639
NSN 6320-01-183-8196
NSN 4140-00-758-7686
NSN 6135-01-556-7318
NSN 6685-01-419-1761
NSN 5910-01-256-0821
NSN 6135-01-397-6564
NSN 6645-01-311-5481
NSN 5996-01-474-6203
NSN 5915-01-502-0630
NSN 5960-01-487-6436
NSN 6650-00-760-1385