System Sensor D4120 4-Wire Photoelectric Low-Flow Duct Smoke Detector, 24VDC/120VAC, (Replaces DH100ACDCLP)
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Key Features
- Reliable duct protection with low-flow photoelectric sensing for early smoke detection and reduced false alarms
- Handles challenging HVAC conditions: operates at 100–4,000 fpm airflow and -4°F to 158°F for broad application coverage
- 4-wire design with 24VDC/120VAC support for flexible integration into existing life-safety and security systems
- Plug-in sensor head and front/back sampling tube for fast installation, testing and low-maintenance servicing
- Patented multi-fan shutdown interconnect for coordinated HVAC fan control and faster event response
- UL-listed and built for commercial environments, helping simplify code compliance and system monitoring
Quick Specifications
- Product Model
- D4120
- Brand Name
- System Sensor
- Product Line
- InnovairFlex
- Product Name
- InnovairFlex D4120 Smoke Detector
Explore the details
Product information
D4120
Overview
Protect building occupants and critical equipment with the System Sensor D4120 4-wire photoelectric low-flow duct smoke detector, engineered for reliable HVAC and duct monitoring in commercial security and life-safety systems. The InnovairFlex D4120 delivers dependable early smoke detection across airflow speeds from 100 to 4,000 feet per minute and withstands temperatures from -4°F to 158°F, making it ideal for varied ductwork environments. Its plug-in sensor head and patented sampling tube allow tool-free installation and straightforward maintenance, minimizing downtime for facilities and service teams. With integrated low-flow technology, improved false-alarm immunity, and support for 24VDC/120VAC power, the D4120 integrates seamlessly into fire alarm, building automation, and security surveillance setups. The detector’s interconnect feature enables coordinated multi-fan shutdown to limit smoke spread during incidents, enhancing overall system response. UL-listed and purpose-built for commercial HVAC protection, the System Sensor D4120 is a practical choice for contractors, integrators, and building managers who require robust monitoring and simplified maintenance. Order the D4120 for reliable duct smoke detection and improved HVAC safety performance.
Features
- Reliable duct protection with low-flow photoelectric sensing for early smoke detection and reduced false alarms
- Handles challenging HVAC conditions: operates at 100–4,000 fpm airflow and -4°F to 158°F for broad application coverage
- 4-wire design with 24VDC/120VAC support for flexible integration into existing life-safety and security systems
- Plug-in sensor head and front/back sampling tube for fast installation, testing and low-maintenance servicing
- Patented multi-fan shutdown interconnect for coordinated HVAC fan control and faster event response
- UL-listed and built for commercial environments, helping simplify code compliance and system monitoring
| General Information | |
|---|---|
| Brand Name | System Sensor |
| Manufacturer | Honeywell International, Inc |
| Product Line | InnovairFlex |
| Product Name | InnovairFlex D4120 Smoke Detector |
| Product Type | Smoke Detector |
| Product Model | D4120 |
| Product Series | InnovairFlex |
| Application/Usage | Air Duct Protection |
| Country of Origin | MX |
| Manufacturer Part Number | D4120 |
| Technical Information | |
| Detectable Medium | Smoke |
| Sensing Technology | Photoelectric |
| Connectivity Technology | Wired |
| Certifications | |
| UL Listed | Yes |
| Certifications & Standards | UL Listed |
| Controls/Indicators | |
| Status Indicators | Yes |
| Physical Characteristics | |
| Depth | 2.50" |
| Width | 5.00" |
| Height | 14.40" |
| Form Factor | Duct Mount |
| Power Description | |
| Power Source | AC Power, DC Power |
| Input Voltage | 120V AC, 24V DC, 29V DC |
| Product Information | |
| Mount Type | Duct Mount |
| Product Replacements & Other Alternatives | |
| Model Number Replaces | DH100ACDCI, DH400ACDCIHT |
| Miscellaneous | |
| Additional Information | 4-wire |
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Is this right for your project?
Confirm the model, required accessories and delivery needs before ordering.
- SKU:
- D4120
- Manufacturer part:
- D4120
How do I confirm compatibility?
Check the specifications and manufacturer documents for your existing system. Send us your model numbers and project requirements if you need help selecting equipment or accessories.
Ask a product specialistWhen will this item ship?
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Shipping, freight and delivery detailsWhat should I know about returns?
Returns require an approved RMA. Consult the linked return policy for deadlines and eligibility. For standard non-defective returns, eligible factory-sealed items carry a 15% restocking fee and customer-paid return shipping; open-box and used items are refused. Defective and DOA claims follow the policy's separate terms. Special orders and other exclusions are final sale.
Read return eligibility and exclusionsSystem Sensor D4120 4-Wire Photoelectric Low-Flow Duct Smoke Detector, 24VDC/120VAC, (Replaces DH100ACDCLP)
D4120