Originally posted by: BW86
back & top fans = exhaust
front & side fans = intake
That's the rule of thumb that the vast majority of us follow... Or at least those of us that have been building systems for a while.
BTW, the fans venting air out can also be termed exhaust fans or pushing out... Pulling out is improper terminology. Pulling in is correct though. Think of it this way, when you breathe you pull air into your lungs, but push it out. You also exhaust gases from vehicles and such, but the air intake pulls into the engine... Get it? Got it? good...