"This Maxxaire Exhaust Fan with Shutter is ideal for use in larger barns, greenhouses and commercial applications requiring superior heavy-duty air exhaust. U.S.A. HP 1/2, Air Delivery CFM 5,500, Fan Diameter in. 30, Depth in. 14, Dimensions L x H in. 35 x 35, Dimensions L x W x H in. 37 x 15 x 38, Needs to be Hardwired Yes, Speeds qty. 1, Amps 6.3, Volts 120. Thermally protected enclosed single-speed 120V, 6.3 Amp PSC motor 5500 CFM Constructed of 20-gauge galvanized steel housing and 28-gauge galvanized gravity-operated integrated shutters Requires adequate intake ventilation"