It'll be on 24/7 so I'm not going to go completely fanless.
I might also be running a handful of other services on the box (Zoneminder perhaps), so I'd rather have a little oomph in the CPU.
I'm going for a uATX board, so I have some slots to play with. For DVB cards, and perhaps an nVidia graphics card, so it can do transcoding to x265 (yes, I know Intel QuickSync can also do hardware x265 encode on the IGP. but I'd like the nVidia option too).
I'm considering a 35W processor, perhaps the mythical i9-9900T, if that becomes a thing in the near future, or just an i7-8700T. But 35W almost for sure

Mobo will probably be a SuperMicro X11SCQ, if I can source one, or a X11SCZ-Q, worst case a X11SCZ-F. I prefer to have more, smaller slots, because most cards will be 1x, maybe 4x PCI-E.
If I could I'd like the smallest possible case, and only zero or one case fans, and a PSU fan.
I'm considering the Coolcube Maxi V4 case.
That case has a CPU cooler clearance of 120mm.
Conveniently, the Nofan CR-80EH is 113mm tall, and the Noctua NH-C14S is 115mm tall, so they should both juuuust fit.
That would put some or most of the heatsink near the PSU fan (I'm hoping they line up, at least a little bit).
So here's my question:
If the PSU I choose is *not* a semi-"fanless" design (ie it's not one that only spins up above a certain temp/load), so actually runs at low RPMs even on low load, then would it be enough to keep things running along in such a case? And without any other case fans?
Has anyone tried using the PSU fan to suck air through the CPU cooler?
TIA