Stainless Steel Co., Ltd. Liaocheng sun is currently the only company specializing in the production of roof ventilation equipment manufacturers. In recent years, the joint efforts of engineers and technicians, the factory produced electricity --- the roof ventilator-free is the specification currently the largest and most complete one of the manufacturers, of which 300, 360, 450 is mainly used in residential buildings, villas floor roof ventilation mouth, 500, 600, 680 is mainly used for large-scale factory workshop and use exhaust ventilation in public places. All stainless steel body, cast aluminum supports a special double-sealed bearings. Product sales over the surface of the country, first class service.