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 6145-01-163-7481
NSN 6150-01-469-6128
NSN 7035-01-445-3563
NSN 5985-00-856-7693
NSN 6240-01-129-1688
NSN 4140-00-557-7001
NSN 5945-01-583-8363
NSN 6620-00-544-5806
NSN 5935-01-477-3590
NSN 5855-01-076-5202
NSN 2925-01-440-9912
NSN 7035-00-553-6951