In my experience in the computer industry, trying to keep high end systems cool, getting the air out as much as in is just as important. So, I would say putting two fans on the opposite end blowing out would be a good option. It is hard to say since I don't know what your vents are like but if you have two fans blowing in and no quick way for the air to escape its just going to swirl around and make it hotter.
Chad
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