The Broan XB110HL1 ULTRA GREEN Humidity Sensing Fan with an integrated LED module, delivers premium performance for today’s demanding requirements. 110 CFM of premium ventilation with ULTRASilent technology operates at the lowest sound rating achievable, less than 0.3 sones. The ULTRASense technology reacts to a rise in humidity, meaning you no longer have to remember to turn on the fan when you shower. The ULTRASmart DC motor and control technology provides energy efficiency almost 10 times greater than ENERGY STAR requirements. With ULTRAQuick installation technology the XB110HL1 provides the fastest, easiest, and most universal installation in remodel, retrofit, and new construction.