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Master Flow S30 Automatic Fan Shutter, 35-3/4 in L, 30-1/4 in W, Aluminum, Enamel SCREWS - PKG - DECK - SS T1473 10' BROWN EAVESTROUGH VMaster Flow Automatic Fan Shutter, Rough Opening Size: 33 3 4 in L X 28 1 4 in W, Aluminum, Enamel, 35 3 4 in L, 30 1 4 in W 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