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Old March 16, 2008, 03:27 PM
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The most obvious factor is that if you have a positive pressure system, all the airflow will enter through the intake fans. This means that it's possible to actually filter all the incoming air. In a negative pressure system, since a portion of the air is being sucked through the gaps and spaces elsewhere in the case, it's extremely difficult to properly filter all the air, which makes it easier for dust to accumulate inside the case.
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