Energy Star,UL,HVI certified exhaust fan BPT14-02A Model:BPT14-02A,50CFM,0.5sones,4"Duct,Power:16WBPT14-13A,70CFM,0.7sones, 4"Duct,Power:18WBPT14-13A,90CFM, 1.0sones, 4"Duct,Power:22WBPT14-24A,110CFM,1.2sones, 4"Duct,Power:28W 1).Longlife ball bearing motor.2).Elegant design.3).Quiet and excellent airflow.4). UL,HVI,Energy..