The FRP fan shell is made of composite FRP material, and the blades are made of excellent aluminum alloy or PP material. The series of fans use the steel design principle to rapidly exhaust the sultry and high temperature gas around the fans. The effect of axial extraction of axial flow fan is effectively divided. This series of fans have the advantages of light weight, stable operation, low mechanical noise, not easy to aging, good corrosion resistance, simple installation, etc....