This Broan ULTRA™ Series fan offers premium ventilation, energy efficiency, and quiet operation. The ULTRASense™ humidity-sensing technology helps manage moisture in bathrooms up to 100 square feet. The fan reacts to quick rises in humidity and increases its speed to clear mirrors faster and keep the room comfortable. ULTRAQuick™ installation technology uses an exclusive telescoping mounting frame with pre-installed screws, snap-in housing, a snap-in blower, and an inside-out mounting duct connector.