The Fan is a unlockable byte on FNaF World. Just like the Pearl Byte, the Fan will stay with the Party no matter what.
The Fan is a grey-white fan that is unlocked right after unlocking all 48 characters, it will stand on the front of the party and can't be killed. It automatically boosts your party, and it randomly shoots a lot of lasers at the enemies.
- It was problably added to the game as a joke, since most people when playing the cannon FNaF games scream at the fan while they are nervous.