No power roof fan, Features ① Environmental Protection: no electricity, continuous operation of energy efficient, no noise, no sparks, with explosion-proof nature. ② weatherproof features: arc-shaped leaves, there is a gap between each leaf and blade rotation leaves complement each other these this gap be filled a lot of rain along the section line of the circle throw a small amount of rain along the leaves of living on the roof not flow into the turbine, while the rotation of the turbine so that the air outflow, blocking rainwater from entering the blade gap. ③ operation of the device: high-tech standard ball bearings, the bearing is completely closed, and never self-lubricating, so that it can rotate in the breeze of less than 3.2km per hour. 
 The Liaocheng Sunlight Stainless Steel Co., Ltd. is currently the only one specializing in the production of roof ventilation equipment manufacturers. In recent years, under the joint efforts of engineers and technicians, factory production of free electricity --- roof ventilation domestic specifications, one of the most complete variety of manufacturers. Contact: King Star Sales Tel :0635 -8,322,238 13,906,356,805