15.8 In.H-W 4.5 In.L Alu Spring Bkdrft Dampr, Damper Application Backdraft, For Nominal Duct Diameter 16 in, Frame Material Galvanized Steel, Number of Panels 1, Maximum Air Velocity 2000 fpm, Overall Height 15 3/4 in, Rough Opening Diameter 16 in, Rough Opening Shape Square, Fits Fan Diameter 16 in, For Duct Shape Square, Free Area 1.6 sq ft, Overall Width 15 3/4 in, Frame Material Thickness 20 ga, Overall Length 4 1/2 in, Frame Depth 2 in, Rough Opening Length 16 in, Maximum Pressure 1 in wc
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