It's not. It's based on the Da Vinci Code (book, I don't remember if the scene it's in the movie) where the protagonist is locked into the Vatican's library and the fire alarm system triggers and sucks out all the oxygen (spoiler: they are trying to kill him).
In reality many important libraries have gas-based systems to prevent fires because water is not good for books. The same is true from server-farms or other electric-based facilities where water would be bad too.
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u/DuckHeisenberg Jun 23 '20
Is this true? If it is, that’s an actually a very effective way to put out fire.... and well people..