Smoke Detector Installation
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A smoke detector is a device that senses smoke, typically as an indicator of fire. Commercial smoke detectors issue a signal to a fire alarm control panel as part of a fire alarm system, while 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 smoke detectors interlinked.
Smoke detectors are 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. Smoke can be detected either optically (photoelectric) or by physical process (ionization). Detectors may use one of the two, or both sensing methods. Sensitive alarms can be used to detect, and deter, people smoking in areas where smoking is banned. Smoke detectors in large commercial and industrial buildings are usually connected to a central fire alarm system. Domestic smoke detectors range from individual battery powered units to several interlinked units with battery backup. With interlinked units, if any of them detect smoke, all of the alarms will trigger even if household power has gone out.
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