Horn-type vacuum blower FRP composite shell made of glass fiber reinforced materials, motors, fan blades are made of high quality aluminum alloy material. Fans of the series the use of negative pressure design principles. Fans around the hot, high-temperature gas pumping rapidly. Effectively distinguish axial fan axial pumping effect. Fans of the series with a light weight, smooth running, low mechanical noise, not aging, good corrosion resistance, easy installation and so on. Fan on the back of the use of air downstream louver design principles. The shutters can be based on the fan opening and closing operation of state autonomy.