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 6620-01-435-7083
NSN 6110-00-237-4862
NSN 5905-00-256-1505
NSN 5935-00-624-8151
NSN 5960-01-577-0628
NSN 5930-00-312-4115
NSN 6135-01-027-7543
NSN 5998-00-954-8265
NSN 6240-01-279-0552
NSN 2925-01-453-1606
NSN 5998-01-531-3338
NSN 5990-01-400-2195