Spring Loaded Backdraft Damper 4"
- Neoprene damper seal minimizes leakage
- 20 gauge steel housing, aluminum spring loaded butterfly damper blades
- Gasket designed to withstand temperatures from -22 F to 180 F
- Requires from 0.04 to 0.08 in. wg pressure to open
- Simple installation in any position – entire assembly inserts into duct
- Exterior foam gasket assures a tight seal against duct