Louver Damper Adjustable 60H x 36W

62.5 In.H 38.5 In.W Drnbl Extrd Alu Combo Dmpr Louver Type Combination Frame Type Flanged Outside Height 59 1/2 in Outside Width 35 1/2 in Rough Opening Height 60 in Rough Opening Width 36 in Louver Maximum Intake 7 510 cfm Maximum Exhaust 10 740 cfm Flange Width 1 1/2 in Free Area 6.7 sq ft Beginning Point of Water Penetration 1 118 fpm Maximum Air Velocity 3000 fpm Blade Angle 45 Degrees Material Aluminum Inside Height 58 1/2 in Inside Width 33 3/4 in Number of Blades 12