A smoke alarm, also known as a smoke detector, is a device that detects smoke and issues an audible sound and/or a visual signal to alert residents to a potential fire.
Facts and Figures
Smoke Alarm Types
Ionization and photoelectric are the two main designs of smoke detectors. Both types must pass the same tests to be certified to the voluntary standard for smoke alarms, but they perform differently in different types of fires. Detectors may be equipped with one or both types of sensors -- known as dual-sensor smoke alarms -- and possibly a heat detector, as well. These sensors are described as follows:
Individual authorities having jurisdiction (AHJs) may have their own requirements for smoke-alarm placement, so inspectors and homeowners can check with their local building codes if they need specific instructions. The following guidelines, however, can be helpful.
Smoke alarms should be installed in the following locations:
Power for the smoke alarms may be hard-wired directly into the building’s electrical system, or it may come from just a battery. Hard-wired smoke detectors are more reliable because the power source cannot be removed or drained, although they will not function in a power outage. Battery-operated units often fail because the battery can be easily removed, dislodged or drained, although these units can be installed almost anywhere. Older buildings might be restricted to battery-powered designs, while newer homes generally offer more options for power sources. If possible, homeowners should install smoke alarms that are hard-wired with a battery backup, especially during a renovation or remodeling project.
Smoke alarms may also be interconnected so that if one becomes triggered, they all sound in unison. Interconnected smoke alarms are typically connected with a wire, but new technology allows them to be interconnected wirelessly. The National Fire Protection Agency requires that smoke alarms be AFCI-protected.
Inspectors can pass the following additional tips on to their clients:
In summary, smoke alarms are invaluable, life-saving appliances when they are installed properly and adequately maintained.
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Credit to: Nick Gromicko and InterNACHI
Whole Home Inspections, LLC
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