Louver Damper Adjustable 36H x 24W

39 In.H 27 In.W Drnbl Extrd Alu Combo Dmpr Louver Type Combination Frame Type Flanged Outside Height 35 1/2 in Outside Width 23 1/2 in Rough Opening Height 36 in Rough Opening Width 24 in Louver Maximum Intake 2 700 cfm Maximum Exhaust 3 862 cfm Flange Width 1 1/2 in Free Area 2.4 sq ft Beginning Point of Water Penetration 1 118 fpm Maximum Air Velocity 3 000 fpm Blade Angle 45 Degrees Material Aluminum Inside Height 34 1/2 in Inside Width 21 3/4 in Number of Blades 7