The RAMFAN UB20 8-inch blower/exhauster delivers the highest CFM in their class. The double wall polyethylene casing and polypropylene blade are designed to operate under heavy workloads and the most demanding conditions. The 1/3 hp, 115V AC motor is ultra-quiet, only 74dB. The 25 ft. duct is protected by the Quick-Couple™ Canister that attaches to either end of the RAMFAN allowing the unit to quickly convert from discharge to suction. The 60 Hz domestic model is CSA rated for outdoor use. The 230V AC, 50Hz international model has CE approvals.