Optimal Airflow

[snyed]

If a case were to have only 2 top fan mounts, what directions should the fans face for the best cooling performance?

Airflow diagram: http://prntscr.com/h6i3ek

 

[stree]

if you have side vents then exhaust only

 

[snyed]

if you have side vents then exhaust only

Didn't think of that, thanks