adding a blowhole to pull hot air outta the top of your box is one of the single best things you can do to cool your rig. heat rises, and you want to be constantly replacing hot air with cool air... makes sense to pull the hot air out the top where it wants to go. My box has a blowhole, PS fan and rear exhaust by the CPU... the air out the blowhole is the warmest of all of them.
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