oldpecan -
I would try to design it to be passive, aka just holes for the dust to fall out of. That wouldn't get the big chunks, but maybe it would make a difference.
I always had a similar(?) idea for houses. Instead of just letting the dust settle onto the floor over time, have outlets at the base of walls with outward facing fans in them. The dust bunnies would be "pulled" to the outlets, which would have to be cleaned out periodically. You'd still have to clean, but maybe not as much. It would work best with a concrete or wood floor that doesn't "grab and hold" the dust.
CarloSW2
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