Best Fan Placement For Airflow (Obsidian 450D Midi Tower)

[Radelly]

Hey TomsHardware

Im getting two new 140mm fans for my rig
I have a corsair obsidian 450D Midi tower, where i currently have two 140mm fans in the front as intake and one 120mm fan exhaust in the back

My question is, should i install both new fans in the top as exhaust or one in the top as exhaust and one fan in the buttom as intake?

 

[muddyparrot]

front, side, bottom-intake
top, back-exhaust as a general rule of thumb, clean (not disrupted) airflow is better than just maxing out the fan for the sake of it though.