8 In.dia Galvanized Steel Backdraft Damper, Damper Application Backdraft, For Nominal Duct Diameter 8 in, Frame Material Steel, Number of Panels 2, Maximum Air Velocity Not Applicable, Overall Height 5 1/8 in, Rough Opening Diameter 7 3/4 in, Rough Opening Shape Round, Fits Fan Diameter 16 in; 24 in, For Duct Shape Oval, Free Area 47.2 sq in, Overall Width 8 3/8 in, Frame Material Thickness 1 mm, Overall Length 3 7/8 in, Frame Depth 1 3/8 in, Rough Opening Length 7 5/8 in, Overall Diameter 8 in
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