Check the information: The medium transported by the centrifugal fan is air and other unnatural, harmless, and non-corrosive gases to steel materials, and the maximum temperature must not be exceeded 80℃; the medium transported by the centrifugal induced draft fan is flue gas, and the maximum temperature must not be exceeded 250℃. The axial flow fan can transport gases harmful to the motor. It can be part of the pipeline and is suitable for transporting 60℃the following harmful gases.

When the wind pressure is not high, an axial flow fan can be used. The cylindrical axial flow fan has bearings, motors, and belts installed in concentric cones, so airflow cannot pass through, preventing corrosion by hot and humid flue gas. Therefore, it is suitable for smoke and moisture exhaust in brick and tile production (kilns and drying rooms must maintain a relatively stable thermal environment, and the required wind pressure is not large).

The selection is based on the continuous operating ambient temperature, and there are fire-fighting types and ordinary types.

Medium-pressure centrifugal fans ( 100mm water column < full pressure ≤ 300mm water column) can not only produce a large air volume, but also have the wind pressure required to overcome the resistance of the ventilation system. Therefore, they are suitable for drying production in the brick and tile industry (extracting waste heat requires a certain air volume and wind pressure). pressure).

axial flow fans and centrifugal fans : 

Performance: centrifugal fans with the same impeller diameter have higher wind pressure than axial flow fans and lower noise than axial flow fans . 

Structure: Centrifugal fans mostly use volute type, and axial flow fans mostly use cylindrical type. 

Price: Centrifugal fans with the same impeller diameter are more expensive than axial fans. 

Impeller : Centrifugal fans are multi-blade forward-inclined or backward-inclined, and axial flow fan impellers are mostly 4-blade or 6-blade type .

Answer (Engineering Yang) With the advancement of technology, the requirements for air pressure and air volume can now be achieved. There is no specific requirement that centrifugal induced draft fans or axial flow fans are required for smoke exhaust, and the exhaust heat is the same.