Fan airflow

[MarcelWIMP]

So I bought a case with two 120mm front fans and also bought a separate 140mm to put in the case so it facing upwards but I'm confused whether the 2 120mm are going to be blowing in or out and whether my 140 should also blow in or out

[zeusthemoose]

I would have the two 120mm in the front blowing in (intake) and the 140mm in the top back blowing out (outtake)

[Adorable Cat]

just about every PC fan (that I know of at least) sucks in from the "front" and blows out the "back", like this

if the 2 120mm fans are intake, you should probably have the 140mm as exhaust towards the back.

[zeusthemoose]

4 minutes ago, Adorable Cat said:

just about every PC fan (that I know of at least) sucks in from the "front" and blows out the "back", like this

To add to this, most fans have arrows showing the direction the air goes.