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 6130-01-010-0975
NSN 4140-00-930-8765
NSN 6135-01-264-7261
NSN 5950-01-421-1425
NSN 5975-01-398-5990
NSN 6145-00-427-7201
NSN 6110-01-633-9660
NSN 6650-00-680-9595
NSN 5910-00-930-8373
NSN 6145-00-578-7521
NSN 6135-00-284-1406
NSN 2925-00-435-5604