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 5925-01-323-6491
NSN 5905-00-946-9274
NSN 5895-01-352-5695
NSN 5925-01-634-0664
NSN 5975-01-540-0822
NSN 5985-00-351-6789
NSN 5835-00-825-2512
NSN 2925-01-424-0235
NSN 6220-01-597-6190
NSN 5930-00-226-8016
NSN 5960-00-349-7650
NSN 6610-01-094-8442