Computer keeps getting dusty. Should I block up all non-airway holes in my case?

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5 Sep 2003
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Cardiff Geordie
I have a pretty big PC case with lots of parts for fans, some of which aren’t covered with that just filter foam stuff. The case also has a few holes for stuff like water cooling pipes/grilles in the unused PCI slot covers that are completely open.

i’m wondering whether I should cover those up with installation tape or similar to impede the flow of dust particles getting sucked into my machine and building up on fans and other such stuff? Or will that impede airflow and make my cooling worse? I considered getting some more fan grille filter foam stuff to cover more of those holes - will that stuff work better?
 
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