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I have bought some more fans but do not know what to do with them? I was wondering whether to do a possessive airflow or a negative 

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Slightly negative will mean less dust.

No, positive air pressure in the case means less dust as it means any unfiltered holes blow out air meaning dust cant get in through them, rather than the holes suck dust into the case like they would if the case had negative air pressure 

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I would say that it depends on the case, but personally I would go with a positive airflow :)

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Really doesn't matter. 

Slightly positive keeps dust out but a balanced amount of intake and exhaust is best. 

 

What fans did you get and what case do you have?

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No, positive air pressure in the case means less dust as it means any unfiltered holes blow out air meaning dust cant get in through them, rather than the holes suck dust into the case like they would if the case had negative air pressure 

oops, meant positive. sorry.

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