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 6105-01-384-7237
NSN 6650-01-426-4253
NSN 5998-01-064-1523
NSN 5895-01-056-4548
NSN 5975-01-076-3656
NSN 6135-00-432-8779
NSN 5960-01-471-4263
NSN 6135-01-558-7257
NSN 5905-01-044-4933
NSN 5998-00-260-9515
NSN 5915-01-208-9179
NSN 5990-01-510-4699