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Originally Posted by soccerchamp76
Actually, that is incorrect. Conservation of mass states that matter cannot be created nor destroyed. Pressure is the term used for various amounts of fluids (air/liquid) per unit. With more intake, he could have greater pressure built up in his case. Having a better or bigger exhaust fan in that case would be necessary to move out the greater amount of air.
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While it's true that there's more to the situation than conservation of mass, I had thought that that something "more" would have been common sense and would not need mentioning.
Even if the case doesn't have an exhaust fan, computer enclosures are not air tight, even if you disregard the exhaust valve(s) that it will certainly have. Thus, the air pressure in the case will equalize and, thus, the same amount of air that was pushed into the case will have left.
QED...