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"Improved" fire suppression systems contain hydrofluorocarbon gases which when burned decompose into HF gas. What could possibly go wrong?

Do NOT stay in the server room (or armored personnel carrier) when the fire suppression system goes off. https://academic.oup.com/milmed/article/177/1/108/4345530

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That doesn't sound like an improvement.

Some fire suppression systems are not intended to save the lives of the people in the place where the fire is. E.g. in the ammunition store on a warship. They are intended to stop the fire before it triggers something much worse (like an explosion)

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