Rugged design provides continuous operation in workshops, barns, poultry houses, greenhouses, garages, anywhere air movement controls condensation and reduces stagnant air. 16in. fan delivers 2600 CFM @ 1650 RPM. U.S.A.Fan Diameter (in.) 16 Air Delivery (CFM) 2,600 at 1,650 RPM HP 1/4 Volts 115 Speeds (qty.) 1 Dimensions L x W x H (in.) 21 x 13 x 23 Needs to be Hardwired Yes. * Totally enclosed air over (TEAO) thermally protected motor * Heavy-gauge galvanized steel fan frame reduces rust and corrosion * Built-in shutter opens automatically when fan is turned on and closes when fan is turned off