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Hmmm ya know..positive pressure..now why didn't the computer case makers think of that....sheesh they have designed their cooling systems all wrong....of course they were probably just trying to cut costs. Got to look at my cases and see what I can do about redoing air flow.
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Because positive pressure creates a turbulence localized near the fan, not a steady airflow covering all the inside of the case evenly. You also loose a bit of airflow, these types of fan don't put a lot of pressure and are most effective blowing the air out (where the resistance, the pressure of the room, is less).
So don't blow in if you don't have a fan blowing out too.