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because after 7 years it needs replacing. It's in the manual.JB

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Q: Why does Nighthawk Smoke and Carbon Monoxide Alarm keep Chirping about every 30seconds even with new batteries?
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What does 24 mean on Nighthawk carbon monoxide detector?

This is the concentration of carbon monoxide in ppm.The maximal recommended exposure level is 35 ppm.Be very careful with a possible carbon monoxide poisoning in your building.


How does a Kidde Nighthawk alarm work?

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What should you check when the time switches to daylight savings times?

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Is the tenant responsible for not replacing the batteries in the smoke alarms and or the smoke alarms after they move out?

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