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 5855-01-549-3243
NSN 6620-00-631-4599
NSN 6650-01-507-9513
NSN 6110-01-492-9694
NSN 6645-00-079-1430
NSN 5975-00-070-5481
NSN 5935-01-487-2616
NSN 5975-00-979-9256
NSN 5965-01-272-4199
NSN 5975-01-399-8564
NSN 5985-01-266-1721
NSN 6135-01-502-3807