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 5915-01-466-4187
NSN 5998-01-200-4509
NSN 5905-01-497-2453
NSN 6240-00-167-2467
NSN 6650-00-801-8298
NSN 6320-00-164-4087
NSN 5975-01-337-2961
NSN 5960-01-374-9706
NSN 5905-00-835-6827
NSN 5965-01-321-1910
NSN 5990-01-623-0082
NSN 5985-01-442-3201