With this adapter, I see that these is only one connector. What else will I need to run three fans with one of these adapters?As long as the current requirements of the fans do not exceed that provided by the power supply, you're good to go. I went with the 2 amp version as I try to follow the Grateful Dead model - always have twice as much power as you really need.
with a bit of diy you can mount the PSU(for pc) in such a way that it exacts air , same as a PC tower....!!!