Fire Damper 10x18 Vertical Mount, Gravity UL Listed
Size 10w"x18h" Type A damper is for horizontally run ductwork and closes by gravity. Notspring loaded. For use with low velocity rectangular ductwork. When used with rectangular duct, the damper is made smaller than the listed duct size and is mounted inside the the air stream. Union Made, UL Listed, 1 On Hand 75A Fire Damper Specs