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Carbon monoxide (garage risk)
Carbon monoxide is an invisible gas from combustion that can build up when vehicles run or when fumes enter the home.
Why it matters
It can make people sick or worse. Garages are a common source because cars and tools can produce carbon monoxide.
Where people get this wrong
Idling a car with the garage door open can still be risky. A carbon monoxide alarm is not a substitute for good separation and ventilation.
Real-world example
On a cold morning, someone starts the car to warm it up. Later the carbon monoxide alarm chirps in the nearby hallway. That is a warning you want to take seriously.
Where this hits your build
This matters during rough-in and before drywall. Once walls close, adding or moving wiring becomes expensive. Plan ahead.
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