

I’ve taken to taping up most of the vents on my boxes, then putting air conditioner filter media in front of the vents I leave open.
This controls the flow to only come through those vents, so they get filtered.
I clean the filters once a month - it’s nice that you can see them to know they need cleaning.
I do change the fans to more powerful ones, usually compressor style (what people call squirrel cage) because they handle airflow restriction better. The trick is how to orient and duct them.




Fortunately p-traps are there and should be (yea, right) removable.
But yea, whole lot better to just not let it happen. BTDT, got the badge.