The forward and backward inclined centrifugal fan mainly refers to the different blades of the fan. The forward inclined type is generally the blower and the backward inclined type is the induced draft fan. The difference is the length of the impeller rung and the impeller edge. The forward inclination is parallel to the impeller edge, and the impeller outlet angle is greater than 90 degrees. The impeller is also known as the forward impeller, and the forward impeller is mostly high-pressure. The backward inclined impeller is not parallel to the impeller, and the difference between the length and the impeller edge is several centimeters or several millimeters, which means that the outlet angle of the impeller is less than 90 degrees. The backward inclined impeller is also known as the backward impeller, and the backward impeller is mainly medium pressure. The differences are mainly reflected in these three aspects:

Difference 1: power. The static pressure head used to overcome the system resistance. The forward inclined centrifugal fan is smaller than the backward inclined centrifugal fan. Because the channel in the backward inclined blade fan is gradually expanded, its hydraulic loss is less than that of the forward inclined fan. Therefore, the efficiency of forward inclined centrifugal fan is lower than that of backward inclined centrifugal fan.

Difference 2: electric energy consumption. Since the efficiency of forward inclined centrifugal fan is lower than that of backward inclined centrifugal fan, its electric energy consumption is greater than that of backward inclined centrifugal fan.

Difference 3: noise. The operation noise of forward inclined centrifugal fan is greater than that of backward inclined centrifugal fan.

Both forward and backward inclined centrifugal fans have their own advantages and disadvantages. You can choose according to the actual needs. At the same time, in the application process, you should learn to develop strengths and avoid weaknesses, give full play to the maximum function of centrifugal fans, and create greater value for the enterprise.