Fan, Exhaust, Shutter, 1 Speed, 18in Dia, 1 Phase, 4.5A, 115V, 60Hz, 1/4HP, 1725 RPM, Aluminum 3 Blade, Galvanized Steel Frame 21-1/8in High x 21-1/8in Wide x 18-1/4in Deep, Gray Polyester Coated Steel Guard, w/ Thermal Protection