YWF4E-500 air cooler axial motor fan ,air cooler motor fan ,500 air cooler fan,500 cooler motor YWF4E-500 air cooler axial motor fan ,air cooler motor fan ,500 air cooler fan,500 cooler motor . An overview of axial fan with external rotor motor1. YWF series axial fans are external rotor motors. These motors have characteristics of compact structure, convenient installation and high efficiency.2. ...