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
One big reason that you want an intake fan is to ensure that the air coming into the PC is coming from a particular direction.
If you just had rear/top exhaust fans, and had openings for air to come in from the front, bottom, and sides, you don’t really know where the air is coming from. The air the fans are pushing out could be passing through the case in such a way that they don’t really cool any of the components.
By adding intake fans, you can better control the path the air is taking through the case, which means better cooling than just passive air intake.
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