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 6145-01-195-7329
NSN 5935-00-783-7529
NSN 6645-00-226-0657
NSN 6240-01-443-0519
NSN 5950-01-360-5335
NSN 5985-01-642-1573
NSN 5945-01-370-4362
NSN 5895-00-218-1355
NSN 6220-01-197-7680
NSN 5835-00-013-9271
NSN 6150-01-506-3826
NSN 5915-01-171-1746