Smoke alarms have a useful life of about ten years.
Smoke alarms are normally installed on the ceiling or high on the wall, with the top of the alarm not closer than 4 inches nor further than 12 inches from the ceiling. Alarms should be no closer than 3 feet from supply registers of forced air heating systems (that might blow on the alarm preventing it from seeing smoke) and no closer than 3 feet from the door to a kitchen or a bathroom containing a shower (steam can set the alarm off when the door is opened).
Smoke alarms have a useful life of about ten years. At that age they should be replaced, even if they seem to be working. This will assure that the alarm will be working when you need it.
Even though prices of today’s smoke alarms are less expensive than you might have paid some years ago, today’s alarms are more reliable. Thus, it is usually not worth keeping an old alarm rather than buying a replacement.
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