How does a fan collect dust if it is always moving?
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Even grounded metallic fans collect dust, so it’s not just static electricity like others have mentioned. There is however a point on every fan blade where the airflow splits apart, and if a dust particle gets perched right on the edge, or a hair gets draped reasonably evenly over it, all the force it experiences pushes it harder onto the edge. This doesn’t happen very often, but fans ingest enormous amounts of dust, so every now and then a particle gets a lucky hit and sticks. And dust particles are stickier than metal or plastic, so other particles preferably stick to them, and you’ve got a self-reinforcing cycle.
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