Re: Fan Setup
In my opinion that would just cause a circulatory air flow over a minimal area of your case; right in through one fan and straight out the other. This isn't ideal because it will take longer to circulate all the air in your case if the air-flow isn't covering a maximum area of the case.
I would have the two side fans be intake fans. Then have one powerful exhaust in the back, (which I'm going to assume can fit a much bigger of at least 120mm).
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