I keep everything in a 10u rack in my garage so it doesn’t bother us much. That said, when it was in my office being configured, it was quieter than my desktop running a 5900x and 3080.

By design, NUC’s are super quiet and the jbods I’m using are cooled with 2 140mm fans running at about 50% most of the time.

Worth noting, I’ve been a metal fan and musician most of my life so my sensitivity isn’t very high compared to a lot of others.