It is normal for the cooling fan to make a small amount of noise during use. As long as we control the noise within a reasonable range, it will have no effect on the cooling fan. So what should be done if the noise exceeds the normal range under special circumstances? The following points are the methods to effectively reduce the noise of AC axial cooling fan:

1. System Impedance

The higher the impedance of the cooling system and exhaust fan, the more noise out of the normal range. The higher the system impedance, the greater the air flow required for cooling. Therefore, in order to minimize noise, the system impedance must be minimized.

2. Airflow interference

Turbulence caused by obstacles encountered in the airflow path can generate noise. Therefore, it is necessary to avoid any obstructions of the cooling fan, especially in the range of the air inlet and outlet, which can reduce the noise.

3. Temperature rise

In a system, the air volume required for cooling is inversely proportional to the allowable temperature rise. Therefore, if the limit on the allowable temperature rise is slightly relaxed, the noise can be reduced.

4. Voltage change

Voltage variations can affect cooling fan noise. The higher the cooling fan voltage, the greater the vibration and noise caused by the increased rotational speed. Therefore, if the air volume is suitable, try to choose a low-voltage cooling fan.

5. Fan size

Because the high rpm exhaust fan produces more noise than the low rpm exhaust fan, and when the air volume is the same, the large-sized low rpm exhaust fan is usually quieter than the small-sized high rpm exhaust fan. Therefore, when the noise requirements are higher, a larger size low rpm cooling fan can be selected.

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