"Homes built before 1975 can still use battery-operated smoke detectors and generally don't have to abide by rules around location. The battery-operated units do need to be UL safety listed and have a 10-year sealed battery, not a throwaway 9-volt. They also need to have a "hush" button to allow someone to quiet the detector after a nuisance alarm. These features prevent someone from taking the battery out and forgetting to reinsert it."
"Homes built after 1975 (or built before 1975 that have had substantial remodeling work done on them) need to bring the system up to today's code - but we encourage everyone to bring their homes up to Massachusetts standards, whether you need to or not. Given what's at risk, it's a modest investment. Massachusetts codes require a hardwired smoke and CO detection system using photovoltaic systems or dual systems using photovoltaic/ionization units."
"To bring them up to code, we need to locate smoke detectors in every bedroom within 3 feet of the doorway, high up on a wall or on the ceiling. CO detectors need to be on each level of the house and within 10 feet of any bedroom. They also need to be in proximity to any fuel-burning appliance. This includes near boilers a"
Holiday fire and carbon monoxide safety requires functioning detectors and cautious use of Christmas trees, space heaters, fireplaces, and wood stoves. Homes built before 1975 may use battery-operated smoke detectors but units must be UL safety listed, have a 10-year sealed battery, and include a "hush" button to silence nuisance alarms. Homes built after 1975 or substantially remodeled must meet modern code with hardwired smoke and CO detection systems, including photovoltaic or dual photovoltaic/ionization units. Smoke detectors must be located in every bedroom within three feet of the doorway, high on a wall or ceiling. CO detectors must be on each level, within ten feet of bedrooms, and near fuel-burning appliances.
Read at Boston.com
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