intake fans help reduce dust wedged in cracks, but exhaust fans in the back and top are the most important for system temperatures. That said fans can be had pretty cheap, so why not put one or two in the front (I only had exhaust for a couple years, but once I put a dedicated graphics card I added intake fans). The intake fans also dropped my hard drive temps.
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Desktop: X3 710, 4GB DDR2 1066, MSI Cyclone GTX 460, Seasonic S12II 500W
Away from home light Gamer: Acer Aspire 15.6", A8-3500m, 4GB 1333
Internet/General Use: Lenovo B570 15.6", i3 2330m, 4gb 1066mhz
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