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There are two answers to that question, depending on the situation:

1. If an electric motor (fan motor) has an internal wiring problem or faulty bearings it can result in an excessive current draw.

2. It takes a lot of energy to move air and depending on the size of the fan motor it may just be designed to move a lot of air and of course that would require a large motor.

Pick whichever answer best fits your situation.

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Q: Why does electric fan pull high amps?
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