Just look the case up if you've never seen it. I'm having a total of 7 case fans and i'm not sure if i should have 6 putting air in and just 1 exhaust fan or not?
More about :bitfenix shinobi window fans intake air exhasust fan
Do you want a very high positive pressure case? It may be better to improve the airflow to balance out and in a little more. Out is usually at the top rear and top of the case.
In at the front and side, and sometimes even the bottom, although I personally never put an intake fan facing the bottom of the case and acting as a vacuum cleaner to suck dust into the case.