Combo Louver Damper, Adj, 35-1/2 H, Alum, DAYTON, Mfr# 5NKH9

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