System Sensor D4120W Watertight 4-Wire Photoelectric Duct Smoke Detector, 24VDC/120VAC
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Key Features
- Watertight NEMA 4 enclosure protects rooftop HVAC and outdoor ductwork from rain, dust and hose-directed water for reliable, long-term monitoring
- Plug-in photoelectric sensor with enhanced false-alarm immunity reduces nuisance alarms and lowers maintenance visits
- Universal 24VDC / 120VAC operation and two DPDT relay outputs simplify integration with existing security and building automation systems
- Wide operating range (100–4,000 ft/min airflow, –4°F to 158°F) ensures dependable smoke detection across diverse HVAC conditions
- Tool-free sampling tube installation and easy-access Test/Reset make testing and service faster, cutting downtime and labor costs
Quick Specifications
- Product Model
- D4120W
- Brand Name
- System Sensor
- Product Line
- InnovairFlex
- Product Name
- InnovairFlex D4120W Smoke Detector
Explore the details
Product information
D4120W
Overview
Designed for demanding HVAC and rooftop environments, the System Sensor D4120W watertight 4-wire photoelectric duct smoke detector delivers dependable smoke detection where standard devices fail. The NEMA 4 watertight housing shields critical electronics from windblown dust, rain and hose-directed water so your fire safety and security monitoring remain uninterrupted. With field-selectable 24VDC or 120VAC power, two DPDT relay contacts and a plug-in sensor head offering superior false-alarm immunity, the D4120W integrates easily into existing surveillance, building automation and fire alarm systems. It operates reliably across airflow speeds from 100 to 4,000 ft/min and temperatures from –4°F to 158°F, making it ideal for commercial rooftops, data centers and industrial duct pathways. Installer-friendly features — including a patented front/back sampling tube, 3/4" conduit knockout and one-button Test/Reset — reduce installation time and simplify maintenance. Choose the System Sensor D4120W for robust duct protection and consistent monitoring performance in harsh environments. Contact us to specify for your next HVAC or facility protection project.
Features
- Watertight NEMA 4 enclosure protects rooftop HVAC and outdoor ductwork from rain, dust and hose-directed water for reliable, long-term monitoring
- Plug-in photoelectric sensor with enhanced false-alarm immunity reduces nuisance alarms and lowers maintenance visits
- Universal 24VDC / 120VAC operation and two DPDT relay outputs simplify integration with existing security and building automation systems
- Wide operating range (100–4,000 ft/min airflow, –4°F to 158°F) ensures dependable smoke detection across diverse HVAC conditions
- Tool-free sampling tube installation and easy-access Test/Reset make testing and service faster, cutting downtime and labor costs
| General Information | |
|---|---|
| Brand Name | System Sensor |
| Manufacturer | Honeywell International, Inc |
| Product Line | InnovairFlex |
| Product Name | InnovairFlex D4120W Smoke Detector |
| Product Type | Smoke Detector |
| Product Model | D4120W |
| Product Series | InnovairFlex |
| Application/Usage | Air Duct Protection |
| Country of Origin | MX |
| Manufacturer Part Number | D4120W |
| Technical Information | |
| Sensor Type | Photoelectric |
| Detectable Medium | Smoke |
| Sensing Technology | Photoelectric |
| Connectivity Technology | Wired |
| Certifications | |
| UL Listed | Yes |
| 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 | DH100ACDCLWP |
| Miscellaneous | |
| Features | Increased wiring space with a newly added 3/4 inch conduit knockout |
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Is this right for your project?
Confirm the model, required accessories and delivery needs before ordering.
- SKU:
- D4120W
- Manufacturer part:
- D4120W
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?
Availability is shown above. Special-order items and project quantities may need additional lead time. Contact us to confirm a delivery date before scheduling installation.
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 D4120W Watertight 4-Wire Photoelectric Duct Smoke Detector, 24VDC/120VAC
D4120W