What are the maintenance requirements for carbon monoxide alarms?

Carbon monoxide (CO) alarms must be maintained and tested according to the manufacturer's instructions. This usually includes: periodic (weekly) testing, vacuum to keep alarm free of dust and debris, and replacing batteries as needed. Most CO alarms have a 5-year lifespan.

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1. What is carbon monoxide?
2. Why is carbon monoxide harmful?
3. Where does carbon monoxide in the home come from?
4. What is a carbon monoxide alarm?
5. Are carbon monoxide alarms required in existing, owner-occupied single-family homes and duplexes?
6. What are landlord / tenant responsibilities?
7. Where in the home should carbon monoxide alarms be installed?
8. Do current rules require carbon monoxide alarms on all levels of the home?
9. What are acceptable power sources for carbon monoxide alarms?
10. What are the maintenance requirements for carbon monoxide alarms?
11. What should people do when the carbon monoxide alarm sounds?