Bk d4120 the system sensor d4120 4 wire photoelectric low flow duct smoke detector senses smoke in the most challenging conditions operating in airflow speeds of 100 to 4 000 feet per minute temperatures of 4f to 158f and a humidity range of 0 to 95 percent non condensing. This detection method when combined with an efficient housing samples air passing through the duct allowing de. The detector housing shall be ul listed per ul 268a specifically for use in air handling systems.
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