Broan-NuTone AE110SL Invent Energy Star Certified Humidity Sensing Fan with Led Light, 110 CFM 1.0 Sones, White Humidity control automatically turns fans on when a rapid to moderate (user adjustable) increase of humidity is sensed or when humidity rises above the user-adjustable set-point (50% to 80% RH) Includes 11 watt, 3000K integrated LED Lighting module for energy efficiency Single speed 110 CFM reduces humidity to quickly eliminate fogged mirrors and manage moisture in bathrooms up to 105 square feet A 1.0 sone rating provides quality ventilation at comfortable sound levels Retrofit installations can be done entirely from the room-side  no attic access required