1. An axial fan has a hub, which has no contribution to the airflow and lowers the efficiency of the airflow, specially the area close to the hub.

2. Axial flow fan generates a rotational or spiral airflow, which causes the turbulence noise and vibrations when it reacts to the fins of heat sink.

3. Axial flow fan has the airflow inlet and outlet, which limits its applications where need lower profile.

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The prominent difference from axial flow fan cooling is that OLC's cross flow fans provide the directional flat airflow parallel to heat sinks and components to be cooled.

It eliminates a space or Z-high for the air inlet and outlet.

It has lower noise, because it provides parallel airflow. It has high cooling efficiency with high airflow through all heat sink fins, because it has no hub.

Try us and see differences.