Delta BreezProfessional Pro200, 200 CFM Bathroom Exhaust Bath Fan Quiet operation at 1.0 Sones LED indicator running light to let you know the fan is running ENERGY STAR Most Efficient for efficient cost-saving operation DC brushless motor engineered to run continuously for a minimum 70,000 hours.Galvanized steel construction resists corrosion, equipped with 6-inch metal duct adapter Energy efficiency at 11.4 CFM/Watt