The fan, underpowered via USB with DC5V instead of DC12V, is quite silent and can be purchased for less than 5€ at Amazon.
A bit of drilling is required to make vents thru the top cover of the mini PC right under the fan (which must PUSH the air downward).
A temperature decrease of approximately -8°C to -10°C (see pics below) is obtained when the PC is blown by this extra fan compared to a configuration without it.
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