... . 3.Quiet and excellent airflow. 4.Energy saving. Circular ultrathin Exhaust fan BPT16-13CModel:BPT16-13C,70CFM,118m3/h, 0.8sones, ... ,achieve to free maintenance,long life and high efficiency energy saving.4.High performance volute and centrifugal impeller by adopting ... the most advanced technology,achieve to super silence,high airflow and high static pressure.5.Technical data:voltage&frequency:120V ...