Quiet, Hidden Design: Provides light while quietly moving air to eliminate humidity, mold, mildew, and other air pollutants from any room Long Life, Guaranteed: Panasonic ventilation fans use less energy to move larger volumes of air; Less energy leads to less overheating and motor failure, saving you on repair costs; Included 5-year warranty on LED lamps and 3-year warranty on parts Easy-To-Install: Works with 4" and 6" ducts for flexibility in duct layout and design; The double hanger-bar system (expandable up to 24") is ideal for positioning the fan exactly where you want it Clean Air: Panasonic ventilation fans will increase your air quality, eliminating humidity, mold, mildew, and other air pollutants from any room Code Compliant: This product is ENERGY STAR certified and can be used to comply with ASHRAE 62.2, LEED, CALGreen(when controlled by Panasonic Condensation Sensor Plus), California Title 24, LEED, IAP, and WA codes and standards