Dust filters on the top of a case?

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ryanxu20021223

Mar 19, 2018
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So i recently got the Phanteks Eclipse p400 and there is an air filter on the top of my case, I thought top mounted fans are meant to be exhaust fans? What is the purpose of this air filter?
 
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Aeacus
There are 2 purposes for having a top air filter on the case:
1. Not all people install top exhaust fans and leave the top side fanless. Dust filter there helps to keep PC internals dust free, especially since dust settles by falling downwards.
2. Some people install AIO rads at the top of the case and use them as intake. In this case, dust filter helps to keep the build clean. But for best airflow, the top should be exhaust.

Bonus: empty case looks aesthetically more pleasing with top dust filter than without one. My Corsair 750D AF Edition also has top dust filter and from Linus'es video, you can tell the aesthetical difference,
youtube: https://www.youtube.com/watch?v=ZpoQqdeqnTo#t=6m52s
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Aeacus

Aeacus

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There are 2 purposes for having a top air filter on the case:
1. Not all people install top exhaust fans and leave the top side fanless. Dust filter there helps to keep PC internals dust free, especially since dust settles by falling downwards.
2. Some people install AIO rads at the top of the case and use them as intake. In this case, dust filter helps to keep the build clean. But for best airflow, the top should be exhaust.

Bonus: empty case looks aesthetically more pleasing with top dust filter than without one. My Corsair 750D AF Edition also has top dust filter and from Linus'es video, you can tell the aesthetical difference,
youtube: https://www.youtube.com/watch?v=ZpoQqdeqnTo#t=6m52s
 
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