9.75 In.H-W 5 In.L GStl Volume Control Dampr Damper Application Volume Control Frame Material Galvanized Steel Number of Panels 1 Maximum Air Velocity 3000 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 16 ga Overall Length 5 in Connection Type Not Applicable Frame Depth 5 in Rough Opening Length Not Applicable