The impeller of LGY axial flow fan adopts high-quality aluminium alloy, and has the characteristics of light weight, high-temperature resistance, rust protection and corrosion resistance. The product uses a unique manufacturing process to ensure compact structure, long working life, stable operation, low noise, and large blowing rat. In the same installation site, the product can perform double way ventilation with both positive and opposite directions and the blade angle can be adjusted according to the air-out demands. The size is from No. 3.15 to No. 11.2, which is 12 in total, and the blowing rate is 2000-65000 m3/h.