Smoke Detector

Smoke detectors are housed in plastic enclosures, typically shaped like a disk about 150 millimetres in diameter and 25 millimetres thick, but shape and size vary.

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Description

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 smoke detectors, also known as smoke alarms, generally issue a local audible or visual alarm from the detector itself.