[SOLVED] Case fans amount?

[Arkham69w]

Hey there, I have currently 2 fans on top of my case which blows air out of the case. So what I wanna ask is, is it worth to put a 3rd fan on top that also blows air out of the case? Also I have a rear fan that does the same. The front 2x fans blow airs in.

 

[CountMike]

Hey there, I have currently 2 fans on top of my case which blows air out of the case. So what I wanna ask is, is it worth to put a 3rd fan on top that also blows air out of the case? Also I have a rear fan that does the same. The front 2x fans blow airs in.

No, amount of air coming in and going out should be about equal, preferably a bit more in than out.