Louver, Intake, 18-24 In, Aluminum, DAYTON, Mfr# 4F952

22 In.H 22 In.W Non-Drnbl Alu Intake Louver, Louver Type Stationary Blade, Frame Type Flanged, Frame Depth 4 in, Mounting Style Surface Mount, Outside Height 22 in, Outside Width 22 in, Rough Opening Height 18 in, Rough Opening Width 18 in, Louver Maximum Intake 1,050 cfm, Maximum Exhaust 1,500 cfm, Maximum Outside Width 28 in, Minimum Outside Width 22 in, Flange Width 2 in, Free Area 1 sq ft, Beginning Point of Water Penetration 766 fpm, Maximum Air Velocity 3000 fpm, Blade Angle 45 Degrees