Depends where the other one is but I think having the top one as the extractor is correct.
http://www.tomshardware.co.uk/faq/id...uter-cool.html
Quote:
Rule #3: Exhaust Out the Top and Rear, Intake Through the Bottom and Front
One of the most important things to remember about cooling: heat rises. That said, it makes the most sense to place your exhausting fans near the top of the case while your intake fans stay near the bottom.
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