I just got two new fans for my comp, and I replaced the stock fan at the top of the case with a new, more powerful, quieter fan. I'm putting a small plexi window in the bottom part of the case that has a fan on it too. My question is, should I point this fan so it blows the air in or out? I was thinking that the bottom fan could blow cold air in, it would heat up and rise to the top, and the top fan would blow it out. Or should I have them both blowing hot air out of the case.