Model d4120 and d4s duct smoke detectors utilize 4 wire photoelectric tech nology for the detection of smoke. D4120 air duct smoke detector with extended air speed range d4s air duct smoke detector sensor component d4p120 air duct smoke detector power board component installation and maintenance instructions 3825 ohio avenue st. Smoke detectors designed for use in air duct systems are used to sense the presence of smoke in the duct.
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