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 5985-01-584-4296
NSN 5905-01-450-8038
NSN 5985-01-023-8011
NSN 5945-01-625-5324
NSN 6610-01-520-6889
NSN 5855-01-561-6826
NSN 6220-01-350-2108
NSN 6130-01-414-3497
NSN 5935-01-096-9878
NSN 6645-00-092-5091
NSN 5960-00-076-5546
NSN 5996-00-102-5425