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 6240-01-309-1806
NSN 5895-01-260-3510
NSN 5920-00-681-1172
NSN 4140-01-415-3907
NSN 6650-00-925-1274
NSN 6150-01-504-8236
NSN 5930-01-055-0596
NSN 5935-00-203-5372
NSN 5855-01-051-4143
NSN 7035-01-535-1450
NSN 6105-00-916-5614
NSN 5996-01-202-8605