A smoke detector is a device used in homes and other buildings to warn people of smoke or a fire. It makes a loud buzzing noise within seconds after smoke enters it through special vents. There are two kinds of smoke detectors, ionization detectors, and photoelectric detectors.

In the 1960s the average U.S. citizen had never heard of smoke detectors. By 1993, an estimated 92 percent of all American homes, single and multi-family apartments, houses, and dormitories were equipped with detectors. In the mid 1980s smoke detector laws, requiring that detectors be placed in all new and existing residents, existed in 38 states nationwide. Smoke detector previsions have been

Proper mounting of a smoke detector also is important. You can mount many detectors by yourself, but those connected to your household wiring should have their own separate circuit and be installed by a professional electrician. If you mount your detector on the ceiling, be sure to keep it at least 18 inches away from dead air space near walls and corners. If you mount it on the wall, place it six to 12 inches below the ceiling and away from corners. Keep them high because smoke rises. (nfsa.org)

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