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Vents KOM 315 U 12 3/8 inch Backdraft Damper Quantity:Vents KOM 315 U 2 Pack Want to know more aboutThe Vents KOM 315 U Spring Loaded Backdraft Damper is tailor made for 12 38" round duct systems, providing reliable defence against backdrafts, as well as warding off unwanted intruders like insects and birds when your ventilation system is idle. This damper stands out for its effortless installation, thanks to its user friendly design. Crafted with a robust 24 gauge galvanized steel housing, it boasts precision engineered aluminum blades featuring a
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