The life expectancy for Carbon monoxide alarm is 5-7 years, depending upon the alarm manufacturer. http://www.mass.gov/eopss/agencies/dfs/dfs2/osfm/pubed/fs-topics/fs-topics-a/carbon-monoxide-safety.html Beginning in March 2007, UL 2034, the standard for single and multi-station carbon monoxide (CO) alarms, required that all CO alarms have an audible … Continue reading →