Actually I think you are asking for the size or fan space. It was an existing water cooler I had on this cyberpower build with a asus MB and intel 2600k Cpu. It's a Asetek 510lc 120mm cooler, it's enclosed, so no maintence It is a single rad. mounted on the back of the case but I have is set up with 2 120mm fans, one pushing and the other pulling. My case is an Inwin dragon rider atx case. It has bottom mounted PSU, 240mm side mounted fan(intake), and 2 upper 120mm fans(exhauset), also 1 120mm front mounted fan(intake).
CPU runs at about 26-27 degrees C at idle with just the desktop showing. System runs about 32C.
Also not doing any overclocking. Running the stock 2.8G on the CPU. That cooler was on a CPU(I7-2600k) running a 10% overclock.
Trying to remember the I7 was I think a 4th generation and the I5 is an 8th. The 8400 was at the top of the line for gaming(at the time)for what I wanted to spend on a CPU, it also did not come with a air cooler.
PCPartsPicker let me ensure all these parts were compatible.