Versatile Easy Installation: Room side installation makes it possible to retrofit with no attic access and without having to cut drywall - saving time and reducing complexity. Built-in Humidity Sensing: Automatically turns the fan on and off when humidity in the room reaches the user-adjustable set-point. Reducing the risk of mold and bacteria growth. SlideClip Grille: Patent pending technology for a springless attachment that allows for fast installation of the grille/cover and easy cleaning. Seamless Design for Easy Cleaning: Modern CleanCover grille blends into the ceiling and allows for quick, easy cleaning. ENERGY STAR 4.1: Reduces energy consumption by over 50% compared to standard bath fans.