@ddash The fan is just sitting on top of the case, mostly centered as the turbine opening is slightly smaller than the case itself.
The duct shoots air horizontally in the general direction of another of a LibreComputer Lepotate. I take that as a bonus.
No, the highest temperature I have ever recorded was 76°C. Without fan, and using thermal pads to connect the case to components.
But I hate high numbers, excessive heat already shortened a Pi lifetime here, since then I am very cautious about that.
For Raspberry Pi4 continuous selfhosted server operations: with and without case fan. This graph show a 20°C decrease, with a slow rpm fan.
The metal case has thermal stickers to reach for main components on both sides, and the fan is what I have in scrap parts, totally not for that case but pushes a lot of air with low noise compared to screaming mini cpu fans.
@Creat When I said I had one Pi lifetime that was shortened it was a way of saying yes, it died from 24/7 high load no fan overheating. Now it just boot and freezes after a couple of minutes.
Then, yes, back in the days when overclocking and over powering was a thing, CPU actually died from all that, I changed a few for customers that didn’t know better. How ironic I did that to myself years later with little arm boards, isn’t it?