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System Sensor Innovair D4120W, Watertight 4-wire P/E Low-Flow Duct Smoke Detector
System Sensor Innovair D4120W, Watertight 4-wire P/E Low-Flow Duct Smoke Detector

System Sensor Innovair D4120W, Watertight 4-wire P/E Low-Flow Duct Smoke Detector

Manufacturer:System Sensor
Manufacturer Part#:D4120W
Our Part#:D4120W
Stock Status: In Stock
Retail Price:$410.19
Your Savings:$123.06(30%)
Your Price:$287.13


System Sensor







Feature 5


Feature 7

Product Type:Duct Detector|Input Voltage:24VDC,120VAC,Other|Detection Type:Photoelectric|Connection Type:Hardwired,System|Intended Use:Commercial/Industrial|Interconnect:No

The System Sensor D4120W is a direct replacement for the discontinued DH100ACDCLWP.


  • NEMA Type 4 UL listed for non-hazardous indoor and outdoor applications
  • UV Resistant, UL listed housing and cover material
  • Photoelectric, integrated low-flow technology
  • Air velocity rating from 100 ft/min to 4,000 ft/min (0.5 m/s to 20.32 m/sec)
  • Versatile mounting options in square or rectangular configuration with modular construction
  • Plug-in sensor offers superb false alarm immunity with the latest sensor technology
  • Increased wiring space with a newly added 3/4-inch conduit knock out
  • Broad range for operating temperature (-4°F to 158°F) and humidity (0% to 95% non-condensing)
  • Patented sampling tube installs from front or back of the detector with no tools required
  • One easy-access Test/Reset button and improved LED status
  • Patented interconnect feature for multi-fan shutdown
  • New high contrast terminal designations
  • Built-in short circuit protection from operator wiring errors
  • Field selectable settings for configuring the detector
  • Two DPDT Form-C relay contacts
  • 24 VAC/DC or 120VAC
  • Backward compatibility with existing Innovair products, including remote accessories


The InnovairFlex D4120W watertight 4-wire photoelectric duct smoke detector is UL listed as a watertight enclosure providing protection against falling dirt, rain, windblown dust, splashing and hose directed water. D4120W duct smoke detector features a pivoting housing that fits various applications: both square and rectangular footprints mount to round or rectangular ductwork.

The InnovairFlex™ Series are the only duct smoke detectors flexible enough to fit configurations from square to rectangular and everything in between.

This unit senses smoke in the most challenging conditions, operating in airflow speeds of 100 to 4,000 feet per minute, temperatures of 4°F to 158°F, and a humidity range of 0 to 95 percent (noncondensing). A plug-in sensor head offers superior false alarm immunity. These features, plus a NEMA 4 rating, allow operators to mount the detector to rooftop HVAC equipment or use the detector in other harsh environments.

The new design provides the same form, fit, and wiring terminations as the standard InnovairFlex unit. Superior test and operational features added to the standard model are also available in this watertight unit. As the only watertight duct smoke detector on the market, D4120W provides unsurpassed environmental protection while simplifying installation, testing, and maintenance.

This InnovairFlex duct smoke detector can be customized to meet local codes and specifications without additional wiring. The new InnovairFlex product line is compatible with all previous Innovair models, including remote test accessories.

WARNING: Duct smoke detectors have specific limitations.


NOT a substitute for an open area smoke detector,
NOT a substitute for early warning detection, and
NOT a replacement for a buildings regular fire detection system.

Refer to NFPA 72 and 90A for additional duct smoke detector application information.

Physical Specifications

(Rectangular) - 14.38 in (37 cm) Length; 5 in (12.7 cm) Width; 2.5 in (6.36 cm) Depth
(Square) - 7.75 in (19.7 cm) Length; 9 in (22.9 cm) Width; 2.5 in (6.35 cm) Depth

Weight: 2.5 lb (1.14 kg)

Operating Temperature Range: -4°F to 158°F (-20°C to 70°C)

Storage Temperature Range: 22°F to 158°F (30° to 70°C)

Operating Humidity Range: 0% to 95% relative humidity non-condensing

Air Duct Velocity: 100 to 4000 ft/min (0.5 to 20.32 m/sec)

NEMA Enclosure Rating: Type 4 - Watertight Indoor/Outdoor

View Full Specifications

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