Contrary to what some sibling comments suggest, I am currently using an older HPE-2530-48G-PoEP switch with the 3 builtin fans swapped for Noctua nf-a4x20-pwm (installation went very smoothly). They are actually less audible than the disks of my NAS next to it. Admittedly, I am only using about third to half the ports and the load is only moderate most of the times but this setup has been working flawlessly for over a year now.

I guess it depends on your workload and the specific hardware involved but using server hardware with quiet fans in a living room environment can certainly be achieved.