... .Quiet and excellent airflow. Ceiling Ventilating fan APT20-43-1 Model:1.APT20-43-1,air :420m3/h, 8"spec,power:30w2.APT25 ... -53-1,air :660m3/h, 10"spec,power:38w3.APT30 ... -63-1,air :960m3/h, 12"spec,power:48w 1 ... :120V,60Hz,220V/230V,50Hz,CFM:250-580CFM(420-960m3/h).