The link for Smoke and Carbom Monoxide Detectors displays a simple break down of the smoke and Carbon Monoxide(CO) detector law 527 CMR32. During the sale of a property, smoke and CO detectors need to be tested and inspected. All detectors need to be less than 10 years old in order to pass a Smoke and CO detector inspection. One and two -family residences built before 1975 that have battery operated detectors, need up to date detectors and they are to have a 10 year sealed( non-replaceable and non-rechargeable) battery.
