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 5950-01-458-6572
NSN 5990-01-413-2405
NSN 6620-00-280-2874
NSN 6685-01-498-2984
NSN 5965-00-275-0491
NSN 5925-01-214-4130
NSN 6645-01-442-6476
NSN 5998-01-388-0268
NSN 6145-01-200-7936
NSN 6105-00-285-2774
NSN 5895-01-385-8239
NSN 6320-01-445-0325