An extremely energy efficient AC brushless motor powers the Vortex S-line patented mixed-flow dual impellers. Built with double insulated walls, noise is reduced to levels that were previously thought to be unattainable. All S-Line models are assembled with high impact resistant polycarbonate casings, an integrated back draft damper and a mounting bracket designed for quick and easy installation. The S-Line models feature a 10 year warranty.
Dual Impellars - much higher efficiency @ 4.9CFM/Watt
Integrated back draft damper - a very nice feature
Mounting Bracket built-in for straight out of the box installation