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Since I can't actually see the document, does it say that the fire alarm can't be muted even in heavy smoke? Or are you just guessing that it might? I would find that surprising.



I don't know. UL doesn't make their rules openly-available. You have to pay them to read them.

But Nest's website says UL's rules forbid the silencing, and I see no reason to think Nest would lie about it.


I found the relevant citation: https://news.ycombinator.com/item?id=9064731




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