[SOLVED] Best airflow config for Focus G?

[puw2]

Not sure if this is the right sub for this question but what kind of fan setup should i have for the best airflow for my case?

2 in the front 1 in the back?
At the moment im running 1 on the roof also but my cpu cooler gets kinda in the way of it so i think thats negatively impacting the airflow.

If someone has the same case as i do please post your fan setup below, or if you have any knowledge of what would be the best.

Also if you could, i'd appreciate a demostration photo aswell but its not needed if its too much of a trouble of course.

Thank you in advance!

Case: Fractal Design Focus G
CPU Cooler: Scythe Mugen Rev.B

 

[SkyNetRising]

2 in the front 1 in the back?

2x 140mm intake fans in front and 1x 120mm exhaust fan in back. This should be enough.