How do ceiling fans collect dust when they’re constantly in motion?
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When ever an item has an airflow over it, the moving air doesn’t actually flow across the surface, but across a thin layer of air that’s not really moving. Most dust gets sucked across that then layer of motionless air (relative to the blade in this case) but some particles basically slam through and into that zone and then stick and stay, protected by the boundary of the motionless and moving air just overhead.
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