9.75 In.H-W 2 In.L Squ Manual Balancing Dampr, Damper Application Balancing, Frame Material Steel, Number of Panels 1, Maximum Air Velocity 2000 fpm, Overall Height 9 3/4 in, Rough Opening Diameter Not Applicable, Rough Opening Shape Square, Fits Fan Diameter Not Applicable, For Duct Shape Square, Overall Width 9 3/4 in, Frame Material Thickness 22 ga, Overall Length 1 7/8 in, Connection Type Not Applicable, Frame Depth 1 7/8 in, Rough Opening Length Not Applicable, Maximum Pressure 2 in wc