27 In. H 51 In. W Drnbl Extrd Alu Intake Louver, Louver Type Stationary Blade, Frame Type Flanged, Frame Depth 4 in, Mounting Style Surface Mount, Outside Height 23 1/2 in, Outside Width 47 1/2 in, Rough Opening Height 24 in, Rough Opening Width 48 in, Louver Maximum Intake 3, 876 cfm, Maximum Exhaust 5, 543 cfm, Maximum Outside Width 50 1/2 in, Minimum Outside Width 50 1/2 in, Flange Width 1 1/2 in, Free Area 3.9 sq ft, Beginning Point of Water Penetration 1, 031 fpm, Maximum Air Velocity 3500 fpm.

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