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Backdraft Damper, Wall Mount, Supply, Damper Size (In.) 25 x 25, Overall Size (In.) 27-3/4 x 27-3/4, Flange Width (In.) 1-1/2, Max. Velocity (FPM) 2250, Construction Material 16-gauge Extruded Aluminum Frame, Galvanized Steel Tie Rods and Stainless Steel Hardware, Includes Felted Edges For Quiet OperationSpecification: Item: Backdraft DamperDamper Size (In.): 25 x 25Construction Material: 16-gauge Extruded Aluminum Frame, Galvanized Steel Tie Rods and Stainless Steel HardwareMax. Velocity (FPM): 2250Includes: Felted Edges For Quiet OperationType: Wall Mount, SupplyFlange Width (In.): 1-1/2Overall Size (In.): 27-3/4 x 27-3/4