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- Q565858 subject Q6814358.
- Q565858 subject Q6900308.
- Q565858 subject Q8220441.
- Q565858 subject Q8266666.
- Q565858 subject Q8459589.
- Q565858 abstract "A smoke detector is a device that senses smoke, typically as an indicator of fire. Commercial security devices issue a signal to a fire alarm control panel as part of a fire alarm system, while household detectors, known as smoke alarms, generally issue a local audible or visual alarm from the detector itself.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 either, or both, methods. Sensitive alarms can be used to detect, and thus deter, smoking in areas where it is banned. Smoke detectors in large commercial, industrial, and residential buildings are usually powered by a central fire alarm system, which is powered by the building power with a battery backup. Domestic smoke detectors range from individual battery-powered units, to several interlinked mains-powered units with battery backup; if any unit detects smoke, all trigger even in the absence of electricity.As of Template:MONTHNAME 2013[[Category:Articles containing potentially dated statements from Template:MONTHNAME 2013]] it is estimated that smoke detectors are installed in 93 percent of US homes and 85 percent of UK homes. Roughly 30 percent of these alarms are estimated not to work, due to excessive age or lack of working battery. The US National Fire Protection Association estimates that nearly two-thirds of deaths from home fires occur in properties without working smoke detectors.".
- Q565858 thumbnail Smoke_detector.jpg?width=300.
- Q565858 wikiPageExternalLink am241.shtml.
- Q565858 wikiPageExternalLink smokealarmreport.pdf.
- Q565858 wikiPageExternalLink home-smoke-alarm-tests.cfm.
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- Q565858 comment "A smoke detector is a device that senses smoke, typically as an indicator of fire. Commercial security devices issue a signal to a fire alarm control panel as part of a fire alarm system, while household detectors, known as smoke alarms, generally issue a local audible or visual alarm from the detector itself.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.".
- Q565858 label "Smoke detector".
- Q565858 depiction Smoke_detector.jpg.