7.5 meters
Masterguard Smoke Detectors are made in Coppell, TX.
5M Detector to Detector
Smoke detectors are devices that detect smoke. They are used as warning devices in houses to warn people of fire.
The smoke detectors use the photoelectric effect or a sensor based on the ionization differences between smoke and air.
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There are several types of smoke detectors that can be used in the home. Interlinked smoke detectors can interlink smoke and heat detectors for better convenience. Also, wireless units can be configured specifically to your needs. More safety and smoke detector information can be found on: http://www.safelincs.co.uk/Smoke-Alarms/
Americium become to be largely used in smoke detectors after 1970.
There are 2 types of smoke detectors: ionization detectors and photoelectric detectors. Although they use different mechanisms both essential set off an alarm when smoke obscures the line of sight between 2 objects within the detector.
Smoke detectors detect smoke by not detecting it. They sense not the smoke, but the oxygen levels surrounding it. when the oxygen levels drop, or when smoke replaces the oxygen, the alarm goes off.
Smoke detectors were invented in the year 1967. :P
You can go to the following website to see reviews about the most efficients smoke alrarms http://www.consumersearch.com/smoke-detectors/best-smoke-detectors