o Structures built before July 1, 1975 shall have a 10 year lithium battery powered smoke alarms or combination alarms that are sealed and tamper-resistant.
o Structures built between July 1, 1975 and June30, 1990, shall have an AC primary smoke alarms or combination alarms.
o Structures built on or after July 1, 1990 shall have an AC primary with battery backup smoke alarms or combination alarms.