Originally Posted by EciDemon
I always figured a positive pressure build was the preferred way to keep dust from building up too bad inside the case. I always had a little bit extra intake then out.
The illustrations is a bit confusing assuming the arrows also corresponds to the amount of air being pushed because then the "negative" pressure illustration is actually positive and vice versa.
Been a long time since i heard any discussion on the topic though!
The white arrows are probably illustrating the pressure, ie: positive or negative.