Have you checked the fan exhaust is not full of fluff and/or cat hair?
Yes it is clean.
It is noisy even you are in BIOS setup not in Windows?
Still noisy if you change this to ‘throttle’?
Yes, maybe it is the normal working noise I don’t know. I will try to change something from the bios.
I definitely wouldn’t turn the fan off in BIOS while using it in the original NUC case (housing).
If it continues to bother you and you can’t move the NUC to a different room (and use a low powered networked fanless ‘endpoint’ inside your listening room, like Sonore microRendu for example) you could maybe consider a fanless case for the NUC itself?
I managed to build one and I’m a pretty slow guy 
Oh, how can I move it into a fanless case? I didn’t know that, that would be great for me.
See above link for example of one I built for my NUC7i7.
Also see below link. What’s the exact/full model of your NUC5i5?
There’s a few Akasa fanless case options:
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It is NUC5i5RYH. Can I do it on 3D printer 
I hope you can spray copper pipe on that printer! 
LOL probably. Depends if you have all the right gear?
You could buy the gear but it might be cheaper to just buy a fanless Nucleus Plus i7
Hahaha I hope one day!
Sean thank you, I will check the bios and then if I can’t solve it I will look for a fanless case.
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Suitable for NUC5i5RYH:
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Can fully recommend the Akasa Turing case.
The Turing case is designed for the 8th generation of Intel NUCs. Efe has a 5th generation NUC…
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Whoops, missed that essential bit of info.
Simply NUC has a selection of fanless NUCs. I’m VERY pleased with mine.
Hi, I had the same problem with my NUC D33217GKE and ordered Akasa case (AK-ITX07-BK) only for 20$ new one from USA. Plus shipping cost to Russia.
You can google com[ability Akasa PDF table for your NUC model. I spend 2 hour to change orig case to funless. Good luck!
It is recommended by Roon to split the core and the output between separate devices. I have a NUC (7i5BNH) that I had doing both roles for a while. Even with ROCK, which is likely the least noisy of the OS options you have, it was still audible on default fan settings and too much for me to cope with in my listening environment. I’ve since adopted a new endpoint (old iPhone 5 with CCK and a Dragonfly Red) and banished the core to my server closet. Problem solved…
There is the fan noise, but there is also electric noise from the actual computing the NUC does (least with ROCK since it is optimized specifically to do this, a bit more with Windows and other Linux distro’s), which -depending on the quality of the components down the line- might end up polluting your signal as well. Even if you eliminate the fan noise with for example a fanless case, you still have the digital noise. You can get rid of it with a direct connection, with some form of galvanic isolation, but it’s far easier and usually more economical to split the endpoint to a dedicated, preferably specifically engineered device…
Hope you find a solution that works for you…