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Set cooling fan airflow so cool supply air reaches the highest-heat components first and hot air exits without returning to the intake. Verify the airflow arrow molded on the fan frame, not the visible blade shape.
How Do You Set Cooling Fan Airflow Direction in Electronic Equipment?
An axial fan is usually better for moving a large volume of air through a low-resistance enclosure, while a centrifugal blower is usually better when air must pass through dense heat sinks, filters, narrow ducts or other high-resistance components.
Axial Fan vs Centrifugal Blower- Which Is Better for Electronics Cooling
