Blowers can be classified into several types according to their materials. Such as iron casing (common blower), fiberglass reinforced plastic (FRP), plastic, aluminum, stainless steel, and so forth. The manufacturing of the blower housing is adopted four kinds of casting processes: sand casting, gravity casting, low pressure casting, and die casting. The process selection of specific qualitative is based on customer's technical standards, and then selects the reasonable production process. At present, our blower housing and impeller production is matched with the customer's ventilation and cooling equipment. The material is mainly aluminum alloy, and the annual usage is 1,500PCSs!