Eli5: Why do fans rotate only in one direction?
In: Other
The blades are shaped in a way to pull air from one direction and push it in another direction. That’s why fans on a computer are designed to go one way – the fans on the front pull cooler air from the outside room and push it into the case; the fans in the back pull that hotter air from inside the case and push it out into the room.
Some fans *do* rotate in both directions. Ceiling fans usually have a “summer setting” and a “winter setting” – set it to one direction and it will fan you with cooler air; set it to the other direction and it pulls the colder air out away from you.
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