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 5996-01-286-1325
NSN 6105-01-611-4382
NSN 7035-00-968-4848
NSN 6610-00-633-4338
NSN 4140-00-360-2457
NSN 5975-00-016-4138
NSN 5835-01-464-7038
NSN 6610-00-860-4222
NSN 5925-01-069-0276
NSN 6650-01-112-0453
NSN 6645-00-171-9639
NSN 5835-00-400-5056