30 In.H 30 In.W Non-Drnbl GSteel Modulr Louver, Louver Type Stationary Blade, Frame Type Hat Channel, Frame Depth 4 in, Mounting Style Flush Mount, Outside Height 29 1/2 in, Outside Width 29 1/2 in, Rough Opening Height 30 in, Rough Opening Width 30 in, Louver Maximum Intake 2,115 cfm, Maximum Exhaust 3,022 cfm, Maximum Outside Width 29 1/2 in, Minimum Outside Width 29 1/2 in, Flange Width Not Applicable, Free Area 2.8 sq ft, Beginning Point of Water Penetration 709 fpm