Combo Louver Damper, Adj, 23-1/2 H, Alum

Combination Louver Damper, Louver Type Drainable, Frame Type Hat Channel, Outside Height 23 1/2 in, Outside Width 23 1/2 in, Rough Opening Height 18 in, Rough Opening Width 21 in, Louver Maximum Intake 1,005 cfm, Maximum Exhaust 1,444 cfm, Flange Width 1 1/4 in, Free Area 1.3 sq ft, Beginning Point of Water Penetration 1,118 fpm, Maximum Air Velocity 3,000 fpm, Blade Angle 45 Degrees , Material Aluminum, Inside Height 22 1/2 in, Inside Width 21 3/4 in, Number of Blades 4, Adjustable Blades Yes