Combo Louver Damper, Adj, 41-1/2 H, Alum, DAYTON, Mfr# 5NKJ0

36 In.H 39 In.W Drnbl Extrd Alu Combo Dmpr, Louver Type Combination, Frame Type Hat Channel, Outside Height 41 1/2 in, Outside Width 41 1/2 in, Rough Opening Height 42 in, Rough Opening Width 42 in, Louver Maximum Intake 3,413 cfm, Maximum Exhaust 4,875 cfm, Flange Width Not Applicable, Free Area 5 sq ft, Beginning Point of Water Penetration 1,118 fpm, Maximum Air Velocity 3,000 fpm, Blade Angle 45 Degrees , Material Aluminum, Inside Height 40 1/2 in, Inside Width 39 3/4 in, Number of Blades 9