Broan QT series ventilation products offer the rare combination of power and extremely quiet operation. Offered with a variety of additional functions such as lights, nightlights and heaters, they also do the job efficiently as most are ENERGY STAR Qualified.Features: 0.7 Sones 110 CFM Sensaire technology detects the rapid rise in humidity over time Auto shut-off time is adjustable from 5 to 60 minutes Helps prevent lingering, excessive humidity which can cause mold Humidity is sensed at the ceiling where it is most prevalent Hanger bars for Easy, Fast and Universal installation in all types of construction UL Listed for use over bathtubs and showers when connected to a GFCI protected branch circuit 6' ducting for superior performance ENERGY STAR Qualified