Industrial fan refers to the fan specially used for ventilation and high temperature smoke exhaust in tunnels, underground garages, advanced civil buildings, metallurgy, factories and mines. It is mainly composed of impeller, casing, inlet collector, guide vane, motor and other parts. The key component of high-efficiency cooling fan is cooling coil, which is composed of advanced fin shape and heat exchange tube. The new technology of expanding tube, the advanced design structure of variable fin spacing on the air facing surface and staggered arrangement of heat exchange tubes ensure perfect air distribution, uniform and reasonable air distribution, and realize high-efficiency heat transfer; it is not easy to frost, and defrosting is efficient, simple and easy.