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 6240-00-333-5627
NSN 5920-01-383-7108
NSN 5920-01-165-2909
NSN 5905-00-797-7640
NSN 6220-01-657-4513
NSN 6150-00-175-7868
NSN 6110-01-171-3269
NSN 5990-00-067-6791
NSN 5998-01-231-6614
NSN 6145-01-280-8067
NSN 4140-00-371-2269
NSN 5910-00-321-8374