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

DAYTON combination louver is designed to protect air intake and exhaust openings from rain and weather while still providing excellent air flow. Mill-finish extruded aluminum drainable frame is 4" deep, 0.081" thick, and has 45° fixed louvers spaced on 4" centers, with pivoting louvers and TPV seals for weathertight closure. Includes 1/2" flattened birdscreen in removable frame mounted on interior. Standard manually-operated linkage kit for opening and closing. Optional motor kit, No. 5NKP0, sold separately.<br /><br /> Item: Combination Louver Damper<br /> Louver Type: Drainable<br /> Louver Max. Exhaust: 625 cfm<br /> Louver Max. Intake: 438 cfm<br /> Intake Louver Outside Height: 17-1/2"<br /> Intake Louver Inside Width: 15"<br /> Louver Free Area: 0.521 sq. ft.<br /> Louver Material: Aluminum<br /> Louver Item: Combination Louver Damper<br /> Min. Wall Opening (In.): 18H x 18W<br /> Flange Width (In.): 1-1/4<br /> Number of Blades: 3<br /> Inside Height (In.): 12<br /> Max. Velocity (FPM): 3000<br /> Outside Width (In.): 17-1/2<br /> Blade Angle (Deg.): 45/90<br /> For Use With: Intake or Exhaust Applications<br /> Includes: Bird Screen and Screen Fasteners