Unpowered fan fan due to the presence of China's sustained and rapid development of the contradiction with the energy shortage, the turbine will be your first choice for ventilation, to maintain life, fresh air of the working environment at the same time, be able to save your electricity costs will be the government advocates companies to accept, entrepreneurs like energy-saving, environmentally friendly products. Natural ventilation fans: wind driven, 24-hour operation. High sensitivity, as long as the breeze or the indoor and outdoor temperature difference can drive the turbine blades rotate. Smooth, quiet, and to improve the indoor environment. The whole group of senior bearing, no lubrication, rugged, very low failure rate. Corrosion resistance, acid and alkali, long service life.