Centrifugal fan can be divided into forward inclined centrifugal fan and backward inclined centrifugal fan. Different structures determine different performance and application. Composition and application of backward inclined centrifugal fan: the fan is composed of external rotor asynchronous motor and plastic / aluminum impeller. The motor has the unique advantages of ventilation, heat dissipation and self cooling, so as to prolong the service life and reliability of the fan.

The fan is a backward curved impeller, which has the characteristics of compact structure, large air volume, high static pressure, low vibration, low noise and convenient installation. It is mainly used for supporting refrigeration equipment such as purification workbench, purification unit, ventilation pipe dust removal, purification air conditioning system, environmental protection and pollution control. Composition and application of forward inclined centrifugal fan: this series of fan consists of external rotor motor.

Plastic or metal front bending impeller and plastic or metal volute are integrated. They have the characteristics of compact structure, small volume, light weight and convenient installation and use. They are widely used in automatic control devices, forced ventilation of electronic equipment, indoor pipeline dust removal, exhaust, heat removal, environmental protection, air purification and pollution control.

The forward inclined and backward inclined centrifugal fans mainly refer to the blades assembled with the fan. The forward inclined type is generally called the blower, and the backward inclined type is generally called the induced draft fan. The difference is the length of the impeller rung and the impeller edge. The forward inclined is parallel to the impeller edge, and the impeller outlet angle is greater than 90 degrees. The impeller is also called the forward inclined impeller. The forward inclined impeller is mostly high-pressure, and the backward inclined impeller is not parallel to the impeller, The difference between the length and the edge of the impeller is a few centimeters or 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 inclined impeller. The backward inclined impeller is mainly medium pressure.