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Backdraft Damper, Roof Mount, Exhaust, Damper Size (In.) 27 x 27, Overall Size (In.) 29 x 29, Flange Width (In.) 1, Max. Velocity (FPM) 2250, Construction Material G-90 Galvanized Steel Frame, Aluminum Blades, Stainless Steel Pivot Pins, Nylon Bushings and Galvanized Steel Tie Rods. , Use w/Dayton Ventilators 4HX87, 4HX98, 4YC52, 4YC53, 4YC54, 4YC55, Includes Pre-punched Conduit Hole Knock-out and Felted Edges For Quiet OperationSpecification: Item: Backdraft DamperDamper Size (In.): 27 X 27Outside Flange (In.): 29 x 29Construction Material: G-90 Galvanized Steel Frame, Aluminum Blades, Stainless Steel Pivot Pins, Nylon Bushings and Galvanized Steel Tie Rods.Max. Velocity (FPM): 2250Includes: Pre-punched Conduit Hole Knock-out and Felted Edges For Quiet OperationType: Roof Mount, ExhaustFlange Width (In.): 1Use w/Dayton Ventilators: 4HX87, 4HX98, 4YC52, 4YC53, 4YC54, 4YC55Overall Size (In.): 29 x 29
