DF low noise centrifugal fan of consummate craft and technological design, firm material, stable and reliable performance, outstanding noise-decrease sffects, it has the features such as low noise, hign efficiency, long life, easy installation etc. It is widely applicable for the industries and departments such as telecom, eletric. Electronics, geology, coal mine, steamboat, , paper-making etc. It is esp. Fit for the cooling, temperature-control, ventilation functions in the plastic; Printing machineries, copying machine, drying machine, blown machine, underground facilities, etc.