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The Sealed Unit Parts Co D4120 is a 4-wire photoelectric duct smoke detector suitable for various duct configurations. It is designed to operate in airflow speeds from one hundred to four thousand feet per minute, making it effective in diverse conditions. This detector works in temperatures between negative four to one hundred fifty-eight degrees Fahrenheit and in humidity levels from zero to ninety-five percent (non-condensing).
This smoke detector features a plug-in sensor that enhances false alarm immunity with easy installation and maintenance. The design allows for a spacious wiring area and includes a three-quarter-inch conduit knockout. Up to fifty detectors can be interconnected. When one unit detects smoke, all interconnected units will activate, allowing for pinpointing of the fire source.
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