Combo Louver Damper Adj 35-1/2 H Alum

30 In.H 33 In.W Drnbl Extrd Alu Combo Dmpr Louver Type Combination Frame Type Hat Channel Outside Height 35 1/2 in Outside Width 35 1/2 in Rough Opening Height 36 in Rough Opening Width 36 in Louver Maximum Intake 2 406 cfm Maximum Exhaust 3 781 cfm Flange Width Not Applicable Free Area 3.7 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 33 3/4 in Number of Blades 7