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 6620-01-379-3300
NSN 5945-01-380-3876
NSN 5925-00-516-2449
NSN 5905-00-316-3510
NSN 5905-00-136-0873
NSN 5945-00-932-3335
NSN 5960-00-841-2716
NSN 5998-01-472-6431
NSN 6620-01-311-3516
NSN 5915-01-482-9620
NSN 5985-01-596-0574
NSN 6610-01-422-1322