I have modified the PSU myself by printing a new backplate and use a 40x40x10 fan (old stock from old pc or other unit). It is a 12V fan so i needed to use a step down supply.
I am awaiting an Austrian brand fan :Noctua NF -A 4x20 FLX with about same air flow but at least 10 dBA less noise.
For now the PSU is working well with a lot less noise.
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