To help with the noise try replacing the fans with high quality ones. I threw some nocturnas into an old managed dell switch and it quieted down immensely.
Just be aware that sometimes they change the pins around from the standard pinout, I blew out one of the fans before discovering this. Fan still works, just lost the rpm monitoring :(
I took a naive approach to it before having any clue about electronics, just replacing one of the (3) internal fans with a quieter one of the same voltage. Mostly to see if that would work.
While it functioned, the "fan warning" light was then permanently on (with the replacement fan in).
If I still had the gear and were to do it again, I'd investigate properly and figure out a real solution. :)
Just be aware that sometimes they change the pins around from the standard pinout, I blew out one of the fans before discovering this. Fan still works, just lost the rpm monitoring :(