The 170FP4 is a 4-inch diameter, 170 CFM, direct drive exhaust fan made by Fantech. It features a thermally protected PSC motor and is designed for continuous operation. The fan has a galvanized steel housing with baked enamel finish and includes mounting brackets for easy installation. With a maximum RPM of 1350, this exhaust fan can move up to 170 CFM of air and has a sound rating of 3.0 sones. The overall dimensions are 11 x 11 x 5 inches and it requires 120V AC power. This exhaust fan would work well for ventilating bathrooms, laundry rooms or other household applications.