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Exhaust, which in conjunction with the PSU fan will bring air in through the front of the case and expel it through the back.
You want smooth airflow through the case in a steady stream. Having an intake and exhaust fan next to each other won't promote that smooth stream and will raise the temperature in your case.
This will, as a side note, create a negative pressure box. What does this mean? Not a whole lot. The air pressure inside the box will be slightly lower than the pressure inside, which will cause air to be pulled in at all the cracks and such. This is good in that it'll induce more cold air into the case, but also more dust and other such crap. Most cases are negative pressure.
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I wake up in the morning more tired than before I slept
I get through cryin' and I'm sadder than before I wept
I get through thinkin' now, and the thoughts have left my head
I get through speakin' and I can't remember, not a word that I said
- Ben Harper, Show Me A Little Shame
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