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Question about cooling.

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I am curious about something, I know about positive and negative cooling but here is one thing that I am not sure on.


I have 2 140mm fans at the front, pulling the air in, and I have 1 120mm fan for exhaust.  My curiosity is there is room at the TOP of my case for another 2 fans.  So if I have another 140mm fan for air intake, and then another 120mm for exhaust would that be a waste of time, or should I do 2x 140mm front for air in, and 2x 120mm for exhausts?

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As we know hot air rises and cold air sinks. So you can leave 2 fans at front and add second 120mm fan for exhaust to existing on back side. Or just add one for exhaust on the top of case.

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