The new FTGX-8- series and FTGX-5-55 series energy-saving fan machines are priority for general centrifugal ventilation fan machines, which can be applied to ventilation, exhaust, heating and air conditioning, and forced cooling in various large buildings such as workshops, factories, warehouses, shopping malls, hotels, conference rooms, sports halls, cinemas, etc. The high pressure centrifugal ventilation fan machine is generally suitable for forging furnaces, cupola furnaces, drying furnaces and other equipment that require high-pressure forced ventilation, rapid cooling, and gas conveying systems for powder and granular materials.