Effective: but...
The filters are efficient, no worries: after 3 weeks, a film of dust already appears on the filter.
But, it should be known, the pressure loss of the fans is significant. I estimate it at 50% of the flow rate (2 Noctua 140mm). This should be taken into account when designing.
Do not hesitate to put a filter bigger than the fan.
They are easy to install (if the surface is flat), easy to remove and clean (with water) even if the magnetic power is a bit weak.
But having a clean interior is a real treat. This will be the standard for my next boxes.
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