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 5895-01-485-4741
NSN 6105-00-862-3212
NSN 5996-00-754-2840
NSN 5965-01-215-3184
NSN 5935-01-122-1017
NSN 5950-01-359-8753
NSN 6105-01-492-7354
NSN 5996-01-493-4329
NSN 5925-01-073-5773
NSN 2925-01-586-9280
NSN 5945-01-501-4469
NSN 5985-00-499-9147