1) The axial length is not limited, and the length of the impeller can be selected arbitrarily according to different use needs;
2) The airflow flows through the impeller and is affected by the two forces of the blades, so the airflow can reach a long distance;
3) No turbulence, uniform wind;
4) Because the airflow is forced to turn in the impeller, the pressure head loss is large and the efficiency is low;
