1, the centrifugal fan changes the flow direction of the medium in the duct, while the axial fan does not change the flow direction of the medium in the duct; 2, the former air volume and air pressure are very large, the latter air volume and pressure are very low; 3, The latter is relatively simple to install; 4, the former motor and fan are generally connected by a shaft, the latter generally within the fan motor; 5, the former is often installed in the air conditioning unit into and out of the boiler drum, induced draft fan, etc., Often installed in the duct, or duct outlet front.