Answer:
Fans are blades inside of a safety harness/cage. The blades are angled so when the spin, they pull air from the back and push it out at the front. Some fans oscillate, meaning they spin back and forth pushing air in a wider range of directions.
First answer by Bloonstd4. Last edit by Bloonstd4. Contributor trust: 20 [recommend contributor recommended]. Question popularity: 1 [recommend question].

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