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18 In.H 18 In.W Drnbl Extrd Alu Intake Louver, Louver Type Stationary Blade, Frame Type Hat Channel, Frame Depth 4 in, Mounting Style Recess 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 744 cfm, Maximum Exhaust 1,063 cfm, Maximum Outside Width 17 1/2 in, Minimum Outside Width 17 1/2 in, Flange Width Not Applicable, Free Area 0.9 sq ft, Beginning Point of Water Penetration 1,031 fpm
Accessory Tool, Compatible with Grainger Part Number 22A604, 22A605, 22A606, 22A607, 3HJV9, 3HJW2A, 6PY35B, 6PY36B, 6PY40A, 6PY41A, Compatible with Manufacturer Model Number NDP-20BPS, NDP-20BPT, NDP-25BPS, NDP-25BPT, Product Type Accessory Tool, Compatible with Brand Dayton