The Nightmare Fan is a joke page, which means it's not meant to be taken seriously at all. Joke pages are typically silly dumb ideas that'd never work or ideas that aren't meant to be taken seriously at all.
"He made me do it."
-The creator of the Nightmare Fan as he was making him.
The Nightmare Fan is the nightmare version of the ever-famous fan. It appears in FNaF: 4 the Final Chapter. It is a much more demented looking version of the usual fan.
The bottom of the fan is aligned with sharp teeth. The Nightmare Fan is made out of a darker metal than the original fan. It has red and black wires sticking out of the center of the fan blades. The Nightmare Fan gives off a red glow at all times.
The Nightmare Fan starts in a random room, never in the office, however. When it gets into the office, it replaces the fan and causes the camera feed to be distorted. The Nightmare Fan does leave after a while, but stays longer on later nights and on higher difficulties. It moves very quickly.
The Nightmare Fan was the fan salvaged and used in the never opened Fazbear's Fright Horror Attraction. It, for some reason, was not charred in the least. Despite people seeing it at the auction, as soon as it was about to be auctioned off, it disappeared. It is unknown how it got to its current location.
- The Nightmare Fan makes a slightly distorted and demonic sounding version of the fan's whirring sound.
- When it leaves and enters the office, it makes a metallic clanking sound.
- There is a hallucination of the head of the Nightmare Fan flashes on the screen, lacking the red glow, much like FNaF1's it's me hallucinations.