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I just got some combo smoke and carbon monoxide detectors that say replace every 7 years, so perhaps 8 years isn’t that bad?


Received wisdom:

Don't buy combination smoke & CO detectors.

Smoke rises, so detectors are best placed on or near the ceiling. CO sinks, so detectors are best placed a few feet above the ground.

Considering the importance of early notification of either condition, these requirements appear irreconcilable.


That's a myth according to this article [1] from a well known US brand of alarms.

[1] https://support.firstalert.com/s/article/Where-to-install-CO...


Thank you for the correction!


What, phones are dangerous to rely on after 7 years?




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