The most common reason smoke alarms fail to activate when there's a fire is smoke failing to reach the detector.
You need at least 1 smoke alarm per floor, and they should be installed where fires are most likely to start - usually the rooms you use most.
#SafeHome21
Do you know someone that may struggle to fit or check their smoke alarm? Could be a friend, neighbour, or family member - why not check theirs too? Give it a vacuum too, to make sure it stays working.#FireKills