For the price, this is a well-equipped welding machine for private use. However, it is annoying that the fans always run at full speed. This is not only unnecessarily loud, but also promotes the ingress of dirt into the device.
Fortunately, there is a simple solution: a 24-volt fan control with a temperature sensor. Manfred Welding has published a good YouTube video on this topic:
I bought the exact same controller at a low price on AliExpress*. The conversion was no problem, and with soldering equipment and heat-shrink tubing*, the whole thing even looks quite professional.