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 6645-00-754-4108
NSN 5945-01-338-6483
NSN 5910-01-098-9962
NSN 6105-00-660-8882
NSN 5895-01-643-6222
NSN 5945-00-166-3964
NSN 5925-01-229-2855
NSN 5945-00-532-0845
NSN 6320-01-247-0898
NSN 5990-01-056-6413
NSN 6145-01-432-2440
NSN 5855-00-494-9581