A: DC blowers are usually installed at the inlet and outlet of air-conditioning units, and at the inlet and outlet of boiler blowers and induced draft fans. Installation is relatively complicated. Axial fans are usually installed near the duct or in front of the duct outlet.

B: Structural differences

1.DC blower generally consists of collector, motor, impeller, shell and transmission parts (such as main shaft, pulley, bearing, triangle belt, etc.).

2. Axial fans generally consist of an impeller, a collector, a cabinet and a motor. The impeller consists of blades and a hub, and the cabinet consists of a blower, a frame plate and a support. The diameter of the blades of an axial fan is limited by the diameter of the housing and the motor is usually located in the fan.

C: Differences in air volume and pressure

1. Blowers have high pressure coefficients and relatively low flow coefficients, and can be categorized into high-pressure (15,000 ~ 3,000 Pa), medium-pressure (3,000 ~ 1,000 Pa), and low-pressure (<1,000 Pa) according to their pressure ratings.

2. Axial flow fan has the characteristics of low-pressure large flow, according to the pressure level is divided into high-pressure (500 ~ 5000Pa), low-pressure (<500Pa). Low pressure is mainly used for ventilation of general places.

D: Differences in principle

1. Blower principle: the airflow flows axially into the rotating leaf channel, is thrown to the outer edge of the impeller under the action of centrifugal force, and is discharged from the air outlet.

2. Principle of axial fan: the gas enters into the rotating impeller axially, and is discharged axially from the other side after being pressurized.