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@Brun
The fan direction debate has been done to death. There's no proof (or none that I've seen at any rate) that things like positive vs negative pressure in the case make the slightest bit of difference. Moving air is the most important thing.
I went along with the reasonably common suggestion that the radiators should be pulling cool air in, so the back and bottom are exhausts. Checked temperatures at various spots inside it and they're pretty consistent. Right now room temp is 23, inside case and water both 27.