Louver Damper Adjustable 60H x 24W

62.5 In.H 26.5 In.W Drnbl Extrd Alu Combo Dmpr Louver Type Combination Frame Type Flanged Outside Height 59 1/2 in Outside Width 23 1/2 in Rough Opening Height 60 in Rough Opening Width 24 in Louver Maximum Intake 4 779 cfm Maximum Exhaust 6 834 cfm Flange Width 1 1/2 in Free Area 4.3 sq ft Beginning Point of Water Penetration 1 118 fpm Maximum Air Velocity 3 000 fpm Blade Angle 45 Degrees Material Aluminum Inside Height 58 1/2 in Inside Width 21 3/4 in Number of Blades 12