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 5835-00-759-1109
NSN 6135-01-493-8375
NSN 6645-01-502-3068
NSN 5985-01-125-1941
NSN 5996-01-442-7148
NSN 5930-01-067-7272
NSN 5935-00-142-0880
NSN 5950-00-508-3325
NSN 5905-01-549-6697
NSN 5975-00-275-7985
NSN 5915-01-023-4447
NSN 5835-01-018-6294