well static electricity what causes shocks when we touch someone or a door handle is present when two rough objects touch and it increases potency the faster the friction is.
well the fans spins at high speeds the air friction and friction at contacts generate a electrical charge.
Basically static electricity on the fans will attract dust and as time goes that dust start to stick more and more and depending on how moist the air is (humidity) it can even clump together into a solid mass.
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