An ultra-efficient DC motor and LED light engine ensure a high-performing, quiet fan/light solution. Utilizing only 7.5 watts, these 80-cfm DC motor fans exceed Energy Star standards. The fan runs continuously at a lower level, then revs up when the switch is flipped or the motion sensor is activated. Long-lasting, ultra-efficient LED lamps make this fan/light combo even greener. WhisperGreen is UL listed for tub and shower enclosures, and comes with a six-year warranty.