15.8 In.H-W 14.5 In.L Squ Mtrzd Contrl Dampr, For Nominal Duct Diameter 16 in, Damper Application Motorized, Number of Panels 1, Overall Height 15 3/4 in, Overall Length 14 1/2 in, Rough Opening Shape Square, For Duct Shape Square, Overall Width 15 3/4 in, Frame Material Thickness 14 ga, Blade Material Galvanized Steel, Maximum Air Pressure 4 in wg, Overall Diameter 15 3/4 in, Rough Opening Length 16 in, Rough Opening Width 16 in, Damper Type Dynamic, Maximum Air Velocity 3500 fpm