This is a case cover for the CHENGLIANG P360W24V power supply from Sovol SV06, with a hole for a 70x70x10 mm fan and a step-down converter (LM2596 HW-411).
There are holes for fusible nuts (M3 with 4.6 mm outer diameter).
Unlike the original case cover, the bottom vents are a bit higher up, so they are not covered on the Sovol SV06.
When wiring, make sure that the cables cannot touch any components that heat up or pull a temperature-resistant protective sleeve over the cable.
There is a small hole in the cover where you can adjust the potentiometer of the step-down-converter. With that you can further reduce the fan noise by slowing it down. Since the fan ist larger and can breath more free than the original fan setup, there should be enough headroom for doing this. Just take care that it starts reliably and blows enough air into the PSU for cooling.
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The author marked this model as their own original creation.