The Delta BreezSmart SMT130H is an ENERGY STAR Most Efficient fan that features an integrated, adjustable humidity sensor for intelligent ventilation control. It is powered by a high-durability DC brushless motor engineered for a minimum 70,000-hour continuous run time UL listed for ceiling mount. Adjustable high speed 80 or 110 CFM fan for spaces up to 110 sq., ft. Features DC brushless fan motor for extended reliability., HVI certified. SMT130H Fan Delta Products Corporation 80 CFM Exhaust Bath Fan/Dimmable LED Light, Bathroom Fixture Humidity Sensor Fan This fan helps reduce mildew and bacteria in your bathroom with the breathability it offers. It turns off when the humidity levels are under 60-percent and... 6 duct, includes 6 to 4 duct reducer Features dimmable LED Light, low profile, with 4 depth to fit between ceiling joists and 2x4 sidewalls. Delta Breez SMT130H | Delta Breez SMT130H Smart 130 CFM Exhaust Fan With Adjustable Humidity Sensor And Speed Control Installer-friendly pocket mounting brackets for room-side installation