Vortex Powerfans are all about performance, reliability, and quality. The high-power maintenance-free motor combined with superior aerodynamic design makes ATMOSPHERE's Vortex Powerfans the performance leader.Features- Extended collar and lip, allowing easy duct hook-up- Impact-resistant, sound-absorbing heavy gauge steel casing - A rustproof Hammertone powder coat epoxy finish - Permanently-lubricated balanced motor ensures long life - 100% speed-controllable factory-installed 120V power cord- 10 year warranty.