Basic principle of our ventilator: The turbine of the ventilator is driven by the convection of indoor the air and outdoors air. The excellent aerodynamic design of the ventilator enables the turbine to revolve with breeze. When the turbine revolves, centrifugal force is created, making the hot and waste air vented from the blade clearance. When some air indoors is vented, meiobar is created in the lower part of the ventilator. The air in the zone of high pressure constantly flows to Anticyclone. If the window or door is open, natural ventilation is formed. 1.It is Energy saving and environmentally friendly. 2.It has quality lubricating bearing system, and is free from maintenance. 3.Long-term durability 4.Quality stainless steel and color coated steel sheet is its raw material. Totally enclosed bearing and delicate techniques make its outstanding durability. 5.It is widely used in industrial factories, commercial buildings, distribution centers. It is easy to install and there is no possibility of leakage