The iLIVING shutter exhaust fan is a must have for your home or business. Our shutter exhaust fan comes with 3 adjustable speeds and build-in thermostat is a must to have fan for cutting your cooling bills and improving comfort. It is perfect for removing excess heat, moisture and unpleasant odors from home and commercial location, including garage, attic, restaurants, factories, warehouses, barns and greenhouses. This fan features aluminum blades, OSHA compliant wire guards and automatic louvers that open and close in tandem with the operation of the fan. The completely enclosed Class B motor is thermally protected and permanently lubricated. Build-in thermostat enables this fan to intelligently regulate the room temperature. It has a control temperature range of 32°F-130°F and a double terminals switch to bypass the thermostat allowing the fan to be always on. The fan comes fully assembled with 6 ft. L, standard 3 plugs AC cable out of the box. No electrician required when plugged into an approved electrical outlet. The shutter fan comes in 8 different sizes: 10 in.-600 CFM, 12 in.-772 CFM, 14 in.-850 CFM, 16 in.-1200 CFM, 18 in.-1736 CFM, 20 in. (2 speed)-3368 CFM, 24 in. (2 Speed)-4244 CFM and 30 in. (2 Speed)-5088 CFM., UL listed. Color: Silver.