Ventilator of this is series is constituted of single phase capacitance forced asynchronous motor with external rotor or three phase asynchronous motor,double-flange cylinder shell,network frame and blade.It boasts the characteristics of strong wind,feeble vibration,low noise and reliable performance,etc.This ventilator is mainly used for ventilation and heat elimination in industries ancluding ground servomechanism,large scale electronic equipment,medical treatment facilities,computer,office automation,welding machine where strong windies needed.It is can also work for ventilation air exchanging and purification on buildings and factories.