Power fan is the use of the nature of the natural wind speed to promote the principle of the turbine rotation of the fan and the indoor and outdoor air convection, any parallel to the direction of air flow, accelerated into the bottom-up vertical air flow in order to improve indoor ventilation effect of a device. The fans do not use electricity, impatient tone, long-term operation. Air laws of nature and the air flow principle, rationalized set at the top of the roof can quickly discharge the indoor heat and foul gases, improving the indoor environment. 
 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