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The Lennox Y2269 is an OEM 4-wire photoelectric low-flow duct smoke detector engineered to monitor airflow within your Lennox HVAC ductwork and shut down the system when smoke is detected, helping prevent the spread of smoke and fire through the ventilation system. Signs that this detector may need replacement include nuisance shutdowns, failure to alarm during testing, or a triggered fault code indicating a failed smoke sensor. This OEM Lennox component provides a direct, reliable replacement to maintain life-safety compliance and protect your building's occupants.