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
You kinda want the entire case to act as an exhaust fan, by using more intake than exhaust fans. If you only have exhaust fans, every crack becomes a vacuum intake and makes it easy for dust to get sucked in.
But, if you have more flow inwards (*going through filters)* then instead of sucking through all the cracks it will be blowing lightly and keep dust from getting inside.
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