The Trane D4120 / SEN01639 / DH100ACDCP is a universal duct smoke detector designed to sense smoke within HVAC ductwork and activate safety controls or alarms. This System Sensor unit integrates a powerful photoelectric detection mechanism with a robust housing, making it ideal for commercial and industrial HVAC systems. Its design ensures early detection of smoke and reliable system shutdown, helping prevent smoke circulation throughout the facility. Key Features Universal compatibility with HVAC systems Photoelectric smoke detection for enhanced sensitivity Rugged construction suited for harsh environments Multiple voltages supported (120/240VAC or 24VDC) Transparent cover for easy inspection Integrated alarm, trouble, and supervisory contacts Specifications Part Numbers: D4120 / SEN01639 / DH100ACDCP Type: Duct Smoke Detector Sensor: Photoelectric Power Supply: 24VDC, 120VAC, or 240VAC Relay Outputs: Alarm, Supervisory, Trouble Air Duct Width: 8" minimum Installation: Direct duct mount with sampling tubes Listings: UL 268A, NFPA 72 compliant Compatible Models This unit is universal and designed to fit a wide range of Trane HVAC systems, including most models using ducted airflow systems across commercial and industrial settings. Why Choose This Item The Trane D4120 / SEN01639 duct smoke detector delivers trusted System Sensor technology, offering dependable smoke detection and integration with safety shutdown mechanisms. Choose this model for code compliance, system safety, and superior detection performance?a must-have for any facility prioritizing occupant protection and HVAC safety.