Here is the power supply. Its a slim one to fit in the 1U box.

It has its own fan. Along with the CPU fan, and four fans up front by the HDD, and a big honking fan blowing across the motherboard, this thing will never overheat. On the other hand, it puts out a prodigious amount of noise when turned on. You would not want to have this in an office or home. Into the closet!