LL Buildsite S30 Automatic Fan Shutter

Injection molded frame with smooth aluminum louvers that automatically open when fan turns on, and close when fan turns off to keep out air, insects, and dust. Balanced shutters for complete automatic service-free operation. Installs centered on joist with 18 or 24 centers with 2 cut openings, 1 on each side of center joist per shutter model. 35-3/4L x 30-1/4W OD, 33-3/4L x 28-1/4 W opening. White enamel finish. Replacement shutter for Master Flow 30BWHFS (whole house fan).Injection molded frame with smooth aluminum louvers that automatically open when fan turns on, and close when fan turns off to keep out air, insects, and dust

Injection molded frame with smooth aluminum louvers that automatically open when fan turns on, and close when fan turns off to keep out air, insects, and dust

Balanced shutters for complete automatic service-free operation