7.8 In. H 11.8 In. W 2 In. L GStl Manual Balnc Dampr, Damper Application Balancing, Frame Material Steel, Number of Panels 1, Maximum Air Velocity 2000 fpm, Overall Height 11 3/4 in, Rough Opening Diameter Not Applicable, Rough Opening Shape Rectangular, Fits Fan Diameter Not Applicable, For Duct Shape Rectangular, Overall Width 7 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. This item has been restricted from sale in the following state (s): []