I recently replaced my PSU and CPU fans and am stunned by how much cooler my system is running. My old PSU fan sucked air in through the back and blew it out the side vents. I reversed the direction on the new fan. My CPU fan was actually going bad (making noises).
I just went to Compusa and bought any POS fans that fit

The side of the box used to feel VERY "warm to the touch". It now feels room temperature!
Good luck!
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