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I'm rather confused about positive air pressure, negative pressure and balanced air pressure.  Sometimes I see builds where the person has 3 120mm fans at the front, a dual 140mm rad with the appropriate fans installed, with only a single static pressure 140mm fan in the rear acting as an exhaust fan.  That seems to be a build with a LOT of positive air pressure.  But I also see opposite, and it seems to be pretty hard to have a balanced air pressure.  I just need some clarification on what's acceptable within the world of air pressure in a case for optimal performance.  Thanks.

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Balanced air pressure is somewhat easy to get, IMO. I have one intake, and 1 exhaust, and I have fairly balanced air pressure.

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I'm rather confused about positive air pressure, negative pressure and balanced air pressure.  Sometimes I see builds where the person has 3 120mm fans at the front, a dual 140mm rad with the appropriate fans installed, with only a single static pressure 140mm fan in the rear acting as an exhaust fan.  That seems to be a build with a LOT of positive air pressure.  But I also see opposite, and it seems to be pretty hard to have a balanced air pressure.  I just need some clarification on what's acceptable within the world of air pressure in a case for optimal performance.  Thanks.

Positive pressure will force dust out of all other places where there isn't fans/dust filters, negative will do the oposite. IMO positive seems like the best way to go, and the performance between must negligible at best.

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