The roof ventilator is mainly used for the indoor ventilation and air-exchange in the arcjitecres such as petroleum,chemical,textile,metallurgy,mechanical factory houses,office,experimental room.warehouse ect.it can adapt to different structural forms and use requirementsform various buildings.it can be installed in the roof or wall.when the operating media temperature is 25 C , the relative humidity should not be larger than90% ， the dust content in the media(including solid,impurity)should not exceed100mg/m 3 .
 

       This fan is mainly composed of the paddle-wheel,wind tube,nozzle button,motor and other fittings.Thepaddle-wheel adopts axial-flow fan with extremely large air volume.it can also be back-draught according to the special needs.The nozz button and base utilize the fiberglass reinforced plastics with light weight,high intensity,anti-corrosion.it has the features of pleasing appearance,rain&wind resistance