Back draft damper, 123 x 23 inches, outside flange 25 x 25 inches, roof mount , G-90 galvanized steel frame, 2 inch deep with 1 inch flange, felted aluminum blades for quiet operation.
Back draft damper, 15 x 15 inches, outside flange 17 x 17 inches, roof mount , G-90 galvanized steel frame, 2 inch deep with 1 inch flange, felted aluminum blades for quiet operation.
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