Why do fans generate a lot of dust?

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Why do fans generate a lot of dust?

In: Physics

they do not make dust, they kick up the dust that is already in your room (or inside the fan if you did not use it for a while).

* The air has lots of dust in it already.
* The dust is too small to see most of the time.
* Fans don’t create dust, but because they draw lots of air towards themselves, they tend to collect dust.
* They collect enough dust that we can easily see it on the fan blades etc.