Master Flow S36N Automatic Fan Shutter, Aluminum, Enamel

Description

Master Flow Fan Shutter, Automatic, 42-1/2 in Length x 37-3/4 in Width Overall, 40-1/2 in Length x 35-7/8 in Width Opening, Aluminum, Enamel, WhiteInjection 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 dustBalanced shutters for complete automatic service-free operation