G4-73 and Y4-73 Boiler centrifugal and induced fans are suitable for the ventilation and induced draft system of thermal power plants where the evaporation amount should be 2-670 t/h.G4-73 can be used for mining industry to ventilate.It can also be used to common ventilation.The medium should be air ,and its temperature should not surpass 80 degC.Induced draft fans exhaust smoke,and its temperature should be less than 250 deg C.