I just ordered a 2-pack of seemingly decent price erformance case fans (http://) and I plan to add them, in addition to the stock case fans, to my HAF 912. My only question is the orientation? I plan to put 1 in the empty front slot (it'll stack above the stock one) and I'll put the other on the top (attaches to the inside of the top panel).
Which way should I have them facing? Should they be blowing air in or out of the case?
I know this is a dumb question, it's just that I've never added fans, and I'm only doing for safety, not that I've really had an issue with heat.
Well generally people use the fronts as intake fans and then either the back or top as exhaust fans so the air goes front to back but it depends on other things as well. If you have a big heatsink for your CPU make sure the fan isn't trying to blow against the main air flow through the case as well because that just doesn't work very well.
The front one should be blowing into the case, the top fan should be blowing out of the case.
You could try using the top fan as an intake instead of an exhaust fan, but your temps will probably be best if you use it as an exhaust.
The fans should have an arrow on them or your manual will specify which direction they should be facing to blow air in that direction.
Thanks guys, the diagram couldn't make it any simpler the logic all makes sense so I'll just use the back/top as exhaust and front as intake. I just checked the stock fans, and that's what they're doing also so it'll be easiest just to keep it the same.