An exhaust fan takes the air from the case and pushes it out into the surroundings. So wouldn’t that very act of removing air from the case create lower pressure in the case, causing air from the outside to get sucked in, regardless of the existence of intake fans?
In: Technology
> causing air from the outside to get sucked in,
That’s called a low pressure configuration, and basically turns your PC into a dust trap. The air will get sucked in through connectors, random vents, PCIE slot covers, etc., bypassing most filters. If your case has decent air filters, you want positive pressure (more intake fan capacity than exhaust) so air is filtered going in, and all the random gaps have clean air going out instead of dusty air going in.
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