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 5905-00-844-8797
NSN 6145-01-605-0948
NSN 5965-01-348-8302
NSN 5910-00-601-6404
NSN 5985-00-994-3682
NSN 6110-01-322-4659
NSN 6150-01-371-0834
NSN 5930-01-049-0890
NSN 5990-00-539-7859
NSN 2925-01-100-3694
NSN 4140-01-012-2460
NSN 5915-01-575-4832