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 5965-00-942-1602
NSN 5930-01-437-5670
NSN 6135-00-110-1981
NSN 6130-01-063-7446
NSN 6620-00-035-5813
NSN 5925-01-381-5199
NSN 5855-01-398-9548
NSN 5925-01-570-9010
NSN 6110-01-555-8410
NSN 5855-01-606-9511
NSN 5998-01-316-7886
NSN 4140-01-113-8313