... design. 3.Quiet and excellent airflow. 4.Certification:UL,CCC. Exhaust fan BPT14-14AModel:BPT14-14A90CFM,150m3/h,0.8sones,4"Duct ... and corrosion.3.High quality ball bearing motor,apply low power consumption,low temperature-rising,environmental,over-heat protection device in design ... (150m3/h),suitable for 80-110Sq.Ft6.Certification:UL,CCC Exhaust fan BPT14-14A