Combination Louver Damper, 36x24, DAYTON, Mfr# 45C679

36 In.H 24 In.W Drnbl Extrd Alu Combo Dmpr, Louver Type Combination, Frame Type Hat Channel, Outside Height 35 1/2 in, Outside Width 23 1/2 in, Rough Opening Height 36 in, Rough Opening Width 24 in, Louver Maximum Intake 1,531 cfm, Maximum Exhaust 2,406 cfm, Flange Width Not Applicable, Free Area 2.3 sq ft, Beginning Point of Water Penetration 1,118 fpm, Maximum Air Velocity 3,500 fpm, Blade Angle 45 Degrees , Material Aluminum, Inside Height 34 1/2 in, Inside Width 21 3/4 in, Number of Blades 7