... . 3.Quiet and excellent airflow. 4.Certification:UL,CCC. Exhaust fan BPT14-14AModel:BPT14-14A90CFM,150m3/h,0.8sones,4"Duct ... simple and elegent appearence.2.Enclosed housing design use high quality metal sheet with professional manufacture,surface is powder coating, ... resistance to rusting and corrosion.3.High quality ball bearing motor,apply low power consumption,low temperature- ...