Selectable setting of 50, 80 or 110 CFM for Effective ventilation to remove moisture and reduce the risk of mold or mildew in most full baths;< 0.3-0.4-0.9 sones for Ultra quiet performance, you might not notice it's on;Retrofit installations can be done entirely from the room-side, no attic access required. This means a faster, easier installation;TrueSeal Damper technology reduces air leakage up to 50%;Can be installed in a wall if mounted 8-ft. or more above the floor;Energy Star certified Product;UL Listed for use over tubs and showers with a GFCI circuit; so you can capture the steam before it spreads throughout the room by locating your fan exactly where you need it the most;Powerful enough for rooms up to 100 sq. ft.;Brighter white grilles blend in to match most common ceiling paint;Brushless DC electronically controlled digital motor is 3X more efficient than standard AC powered ventilation