Effective January 1, 2007, every dwelling unit is required to have at least one approved carbon monoxide alarm in operating condition within 15' of every room used for sleeping purposes. Alarms can be:
- Plug-in with battery back-up
- Wired into the AC power line with a secondary battery back-up
The alarm can be combined with smoke detecting devices if the combined unit complies with specific standards and the alarm differentiates the hazard.