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Lead Contents

Axial Fans

Introduction Features
Principles Classifications
Engineering Data Further Information
Explanation of Terms Troubleshooting

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Primary Contents

What Is an Axial Fan?

Axial fans are used for stable cooling in many different applications and locations.
If the temperature of a device increases, the lives of its internal parts will be reduced and malfunctions could result.
Particularly devices and parts that generate heat are greatly affected by heat.
Device internal cooling and fan selection are extremely important to long-term usage of the parts inside devices.


OMRON's Axial Fans are classified as shown below.

Selecting a Fan


(1) Estimate the amount of heat generated (W) inside the Unit.

(2) Set the maximum permitted temperature rise limit (ΔT) inside the Unit.

(3) Calculate the required flow rate.

(4) Estimate the system impedance from the air flow through the Unit or from previous data.

(5) Select the Fan according to the P - Q characteristics.

(6) Measure the temperature rise in an installed Unit.

(7) Reappraise the Fan if the measured cooling effect is insufficient.

The procedure to select a Fan is described above. It is difficult, however, to obtain the actual system impedance.
In general, therefore, select a Fan with a maximum flow rate of from 1.3 to 2 times the flow rate required.

As a rough guide, 1.3 times for a small system impedance, 1.5 times for medium, and 2 times for large.

Reconsider the Fan if the cooling effect is insufficient after the selected fan has been installed in the Unit and the temperature rise has been measured.