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Intake Louver Fixed Drainable 18H x 18W
21 In.H 21 In.W Drnbl Extrd Alu Intake Louver Louver Type Stationary Blade Frame Type Flanged Frame Depth 4 in Mounting Style Surface Mount Outside Height 17 1/2 in Outside Width 17 1/2 in Rough Opening Height 18 in Rough Opening Width 18 in Louver Maximum Intake 1 034 cfm Maximum Exhaust 1 478 cfm Maximum Outside Width 20 1/2 in Minimum Outside Width 20 1/2 in Flange Width 1 1/2 in Free Area 1 sq ft Beginning Point of Water Penetration 1 031 fpm Maximum Air Velocity 3500 fpm
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21 In.H 21 In.W Drnbl Extrd Alu Intake Louver Louver Type Stationary Blade Frame Type Flanged Frame Depth 4 in Mounting Style Surface Mount Outside Height 17 1/2 in Outside Width 17 1/2 in Rough Opening Height 18 in Rough Opening Width 18 in Louver Maximum Intake 1 034 cfm Maximum Exhaust 1 478 cfm Maximum Outside Width 20 1/2 in Minimum Outside Width 20 1/2 in Flange Width 1 1/2 in Free Area 1 sq ft Beginning Point of Water Penetration 1 031 fpm Maximum Air Velocity 3500 fpm
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