My opinion...
It all depends on how much dust you have in the air.
On my system, a filter would fill up with dust quite quickly.
Pretty much 2 choices:
1. Live with the dust getting into the PC & do preventative maintenance to prevent problems. This gives better airflow, but can lead to greater dust buildup.
2. Put a filter on. This means lower air flow, but can help reduce problems associated with dust.
I currently use Air Conditioner filter material & have no problems with it. It's hidden inside the system.
The aluminum screen filters work good too and look better if they're gonna be seen.
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