Shutter for 24 In. Whole House Fans

Enjoy a cool and comfortable house once again with our automatic replacement shutter. The shutter's veins run lengthwise with a stationary center vein designed to fit over a ceiling joist, so no cutting is required!For use only with Cool Attic 24 in. direct drive and belt drive whole house fans. This shutter is compatible with fan models beginning in CX242DDWT and CX24BD2SPD. Features: Aluminum construction. 26 in. x 28 in. rough opening. No-cut joist installation 95% + closure prevents air backflow Primary Color White Secondary Color None Dimensions 27.75 in. x 29.75 in. (outer); 23.75 in. x 25.5 in. (inner) Unit Weight 5 lbs. Box Dimensions 3 in. x 22 in. x 22 in.