The US National Fire Protection Association reports 0.53 deaths per 100 fires in homes with working smoke detectors compared to 1.18 deaths without (2009–2013).
The risk of dying in a residential fire is cut in half in houses with working smoke detectors. Usually, an individual commercial smoke detector unit does not issue an alarm some, however, do have built-in sounders. This happens even if household power has gone out.Ĭommercial smoke detectors issue a signal to a fire alarm control panel as part of a fire alarm system. With interlinked units, if any unit detects smoke, alarms will trigger at all of the units. Household smoke detectors range from individual battery-powered units to several interlinked units with battery backup. Household smoke detectors, also known as smoke alarms, generally issue an audible or visual alarm from the detector itself or several detectors if there are multiple devices interlinked. Smoke detectors in large commercial and industrial buildings are usually connected to a central fire alarm system. Sensitive alarms can be used to detect and deter smoking in banned areas. Detectors may use one or both sensing methods. Smoke can be detected either optically ( photoelectric) or by physical process ( ionization). Smoke detectors are usually housed in plastic enclosures, typically shaped like a disk about 150 millimetres (6 in) in diameter and 25 millimetres (1 in) thick, but shape and size vary. A smoke detector is a device that senses smoke, typically as an indicator of fire.
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