Delta Breez SIG80 Signature 80 CFM Exhaust Fan Virtually silent at less than 0.3 sones An indicator light underneath the grille assures you that this quiet fan is running ENERGY STAR qualified for efficient cost-saving operation Precision engineered with DC brushless motor for extended reliability, this fan will outlast many household appliances Galvanized steel construction resists corrosion, equipped with metal duct adapter