Continental Fan BDD100 4" Spring Loaded Backdraft Dampers

BDD backdraft dampers are available in the spring-loaded and gravity style backdraft dampers. The spring loaded dampers are available in 4", 5", 6", & 8"models with a center pin design and a 10" & 12" center post design. Features: 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. Includes stamped metal sleeve with center pin design. Specifications: Size: 4".