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 6110-01-512-5246
NSN 5920-01-352-3625
NSN 6130-01-570-0004
NSN 5996-00-005-7979
NSN 5998-00-553-2849
NSN 5920-01-430-2530
NSN 5960-01-194-4506
NSN 5910-01-030-7672
NSN 6145-00-984-0956
NSN 5905-01-331-5778
NSN 6130-00-269-4077
NSN 6130-01-174-4208