Hello,
I have a beautiful (but noisy) online Xanto 1000 UPS.

I am replacing his fan with a Noctua NF-r8.
I would like to also add a thermal controller to further reduce noise.
It has to be analog (not PWM) with a thermistor I suppose.
I am searching with google but I find nothing: can you lend me an hand?

Thanks in advance,
Mario

You are sure that you will not burn your place?
Because it seems like that fan is moving some air out of the usv. If you drastically reduce the cooling, you could run into serious thermal problems. Worst case could be the overheating usv is causing a fire. So, fan swapping yes but keep up abreaonable amount of cooling functionality.

Online Xanto upses have temperature alarm fan and shutdown.
Anyway my idea is to put not a slow fan but a "fast" silent fan (with CFM comparable to original one) and use temperature sensor to lower RPM a bit.

Thanks,
Mario