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 6145-00-246-9776
NSN 5945-01-085-9318
NSN 5920-01-347-0728
NSN 5950-01-522-3161
NSN 5920-01-157-9471
NSN 5960-00-111-8456
NSN 5835-01-512-4834
NSN 5835-01-083-8131
NSN 5895-01-568-0851
NSN 5935-01-391-0485
NSN 5835-01-595-4099
NSN 5950-00-032-6432