Take some measurements. Pull the system out, clean it thoroughly, mark the date three months from now, and on that date pull it out again and check to see how dirty it is. If you are building up substantial dust inside the case after 3 months, you probably need better filters on your intake fans. Placing a system on top of a desk can also help lower dust levels. Dust tends to settle, so more is found near the floors, especially if your system is sitting on carpet. Carpet fiber floats when disturbed but quickly settles.
Most system designers place intake fans at the lowest point in the case and output fans near the top so that convection forces (hot air rises) work with the fans and not against.
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I've learned to embrace my inner Geek.
I haven't found anything else I'm good at.
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