I bought a silverstone TJ08B-E micro-atx mini tower and corsair TX750v2 PSU. The case has a 120mm fan vent in the top directly over where the power supply gets installed yet the instructions for the case recommend installing the PSU fan side down if it has a 120mm fan or larger in it. Any idea why? What's the point of having the vent there if you don't use it?
http://www.silverstonetek.com/product.php?pid=303&area=en
http://www.silverstonetek.com/product.php?pid=303&area=en