[SuSE Linux] Case cooling fans

I put together a new system last weekend and I've never had any concerns with keeping my system cool. When I put it together I used a heatsink and cpu fan (without thermal compound, I'm going to radio shack this weekend), but I picked up a case cooling fan. It's one of those that is mounted in the front of the case. My question is...WHICH way should the airflow be? Should it take air in through the front of the case and pass it back through the system, or should it pull air in through the back and out the front? Yeah I know this is off topic, but I'm sure someone here can help me out. TIA, Mark - To get out of this list, please send email to majordomo@suse.com with this text in its body: unsubscribe suse-linux-e