240 Volt/ 50-60 Hz, Through-Wall Utility Fan. With 90 CFM, 3.5 Sones, 1 Amps, 6 duct. Can be installed in outside walls from 5-1/4 to 10 thick (wall with less than 6 thick will not use the 6 diameter flexible duct). 6 Diameter Flexible duct included.