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12 In.H 15 In.W Drnbl Extrd Alu Combo Dmpr, Louver Type Combination, Frame Type Hat Channel, Outside Height 17 1/2 in, Outside Width 17 1/2 in, Rough Opening Height 18 in, Rough Opening Width 18 in, Louver Maximum Intake 438 cfm, Maximum Exhaust 625 cfm, Flange Width Not Applicable, Free Area 0.5 sq ft, Beginning Point of Water Penetration 1,118 fpm, Maximum Air Velocity 3,000 fpm, Blade Angle 45 Degrees , Material Aluminum, Inside Height 18 in, Inside Width 18 in, Number of Blades 3
27 In.H-W 6.5 In.L Fiberglass Backdraft Damper, Damper Application Backdraft, For Nominal Duct Diameter Not Applicable, Frame Material Fiberglass, Number of Panels 1, Maximum Air Velocity 2500 fpm, Overall Height 27 in, Rough Opening Diameter 24 1/2 in, Rough Opening Shape Square, Fits Fan Diameter 24 in, For Duct Shape Not Applicable, Free Area 3.3 sq ft, Overall Width 27 in, Frame Material Thickness 0.1 in, Overall Length 6 1/2 in, Connection Type Not Applicable, Frame Depth 3 in
39 In.H-W 6.5 In.L Fiberglass Backdraft Damper, Damper Application Backdraft, For Nominal Duct Diameter Not Applicable, Frame Material Fiberglass, Number of Panels 1, Maximum Air Velocity 2500 fpm, Overall Height 39 in, Rough Opening Diameter 36 1/2 in, Rough Opening Shape Square, Fits Fan Diameter 36 in, For Duct Shape Not Applicable, Free Area 7.4 sq ft, Overall Width 39 in, Frame Material Thickness 0.1 in, Overall Length 6 1/2 in, Connection Type Not Applicable, Frame Depth 3 in