Atmosphere’s all new galvanized steel back draft dampers fit directly into the duct simplifying installation. They feature a shaft for each of the 2 flaps so to prevent jamming. Also, the flaps close onto a perimeter gasket ensuring the best air seal and quiet operation

Spring loaded backdraft damper

• Neoprene damper seal minimizes leakage
• Requires from 0.04 to 0.08 inches wg pressure to open
• Simple installation in any position - entire assembly inserts into duct
• Gauge: 20