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 6105-00-740-7757
NSN 6650-01-316-1191
NSN 6320-01-441-2438
NSN 6610-00-953-9670
NSN 5925-01-330-6518
NSN 5930-01-322-7797
NSN 6620-01-330-3917
NSN 5905-00-690-2549
NSN 6135-01-210-8715
NSN 5950-01-435-6354
NSN 6620-01-314-8605
NSN 5998-00-053-1514