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I run mine open, screens could help but its about the air intake and velocity.
There are folks that run the filters and I am unsure of how that works. I find restricting the air flow causes flooding. When I use a nylon sock with a fine mesh it is fine around town, problem comes when you hit the units wide open.
=FLOODING
So I am in year 6 with wide open stacks, screens would keep out large rocks but the fine dust dirt is no doubt the biggest issue.
My $0.02
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