This sign telling you to stay inside the apartment building when the alarm soundsSubmitted by DeepPossession8916 t3_11c6vvo in mildlyinteresting
Fickle-Classroom t1_ja2abdu wrote
Reply to comment by joeri1505 in This sign telling you to stay inside the apartment building when the alarm sounds by DeepPossession8916
This engineering YouTube explains the engineering/science behind it. It is very specific to building design and whole of system fire suppression and response.
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