"This Maxxaire Exhaust Fan with Shutter is ideal for use in larger barns, greenhouses and commercial applications requiring superior heavy-duty air exhaust. Fan Diameter in. 30, Amps 6.3, Speeds qty. 1, Air Delivery CFM 5,500, Volts 120, 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, HP 1/2. Thermally protected enclosed single-speed 120V, 6.3 Amp PSC motor 5,500 CFM Constructed of 20-gauge galvanized steel housing and 28-gauge galvanized gravity-operated integrated shutters Requires adequate intake ventilation"