A duct detector samples air passing through fans, blowers, and air- conditioning systems, preventing the spread of toxic gases throughout the protected area. This type of smoke detector monitors the HVAC air traveling through ductwork by means of a photoelectric sensor. It has the advantage of being able to sample a much greater volume of air than an ordinary smoke detector can.
Duct detectors are often included in the installation of ventilation and exhaust ductwork of facilities with mainframe computers and tape drives. Duct detectors, however, are not a substitute for smoke detectors that provide early warning detection.
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