DC centrifugal fans may experience under-voltage operation, which can have significant impacts on their performance and lifespan. Under-voltage can occur due to power supply issues, such as a weak battery in a portable system or fluctuations in the mains power supply.

When a fan operates under low voltage, the motor may not be able to rotate at its designed speed. This can lead to reduced airflow and inefficient cooling. The torque generated by the motor may also be insufficient to overcome the resistance in the fan system. In the long run, continuous under-voltage operation can cause the motor to overheat as it tries to draw more current to compensate for the low voltage, which can damage the windings and other internal components.

To address under-voltage issues, voltage regulators can be used. These devices can stabilize the input voltage to a more suitable level for the fan. In some cases, backup power supplies with voltage compensation features can be employed to ensure a consistent power supply. Additionally, monitoring systems can be installed to detect under-voltage situations and trigger alarms or automatic shutdown procedures to protect the fan.