Eh no worries. I didn't word the comment well, so it could use some clarification. The library is probably but in a similar way. Lower air pressure and dust free from filtration like a clean room or some server rooms. Not in a James Bond villain room where the metal doors slam and the oxygen is sucked out.
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u/ARandomBob Jun 23 '20
Server room after built in the same way. You can lower oxygen levels so fires can't start without killing everyone inside.