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People aren't supposed to sleep in garages, so it's not required.

What wouldn't a normal smoke alarm work in a garage?

Excessive dust can trigger false alarms. They make heat detectors for spaces like garages and attics.

https://www.homedepot.com/p/Kidde-Firex-Hardwired-Inter-Conn...

I put a nest smoke alarm in my garage over my EV. Since I don't have a ICE vehicle and the temperature doesn't drop much in my area it seems to work fine after 18 months.

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