5.75 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 5 3/4 in Rough Opening Diameter Not Applicable Rough Opening Shape Square Fits Fan Diameter Not Applicable For Duct Shape Square Overall Width 5 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