roof fan

1.No power ventilation fan use natural wind driven or air heat convection caused by Indoor and outdoor temperature difference to push turbine run, then exhaust the indoor not fresh air by centrifugal force and negative pressure. 2.Curved blades are the best results of scientific calculation and it can ensure no rainwater intrusion. 3.Unique variable angle tube suit for any industry workshop, poultry farm, high building,residential houses etc. Better improve work environment

1.No power ventilation fan use natural wind driven or air heat convection caused by Indoor and outdoor temperature difference to push turbine run, then exhaust the indoor not fresh air by centrifugal force and negative pressure. 2.Curved blades are the best results of scientific calculation and it can ensure no rainwater intrusion. 3.Unique variable angle tube suit for any industry workshop, poultry farm, high building,residential houses etc. Better improve work environment

1.Need no energy: Nature wind drives,operating in 24hs the whole day 2.High efficient air & moisture removal capacity, better than that of similar products over 25% 3.Unique blade design with smart operation and wind-proof & rain-proof 4.Imported bearing, free lubrication,no noise and free maintenance 5.Unique variable angle tube help to realize easy installation 6.High-quality stainless steel body. Supporting brackets are all made of stainless steel, which has very good

1.Need no energy: Nature wind drives,operating in 24hs the whole day 2.High efficient air & moisture removal capacity, better than that of similar products over 25% 3.Unique blade design with smart operation and wind-proof & rain-proof 4.Imported bearing, free lubrication,no noise and free maintenance 5.Unique variable angle tube help to realize easy installation 6.High-quality stainless steel body. Supporting brackets are all made of stainless steel, which has very good