System Sensor D4120W Watertight 4-Wire Photoelectric Duct Smoke Detector

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  • $273.13
  • Regular price $475.90


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.

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.

WARNING: Duct smoke detectors are NOT a substitute for open area smoke detectors; NOT a substitute for early warning detection; NOT a replacement for a building’s regular fire detection system.


Operating Temperature: –4° to 158° F (–20° to 70° C)
Storage Temperature: -22°F to 158°F (-30°C 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)
Dimensions: Rectangular - 14.38 in L x 5 in W x 2.5 in D (37cm L x 12.7cm W x 6.36cm D) Square - 7.75 in L x 9 in W x 2.5 in D (19.7cm L x 22.9cm W x 6.35cm D)
NEMA Enclosure Rating: Type 4 – Watertight Indoor/Outdoor
Alarm auxiliary contacts (DPDT): 10A @ 30 VDC (resistive); 10A @ 250 VAC (resistive); ½ HP @ 240 VAC ; ¼ HP @ 120 VAC
Alarm Initiation Contacts: 2.0A @ 30 VDC (resistive)
Power Supply Voltage: 20-29 VDC; 24 VAC, 50-60 Hz; 120 VAC 50-60 Hz
Input Capacitance: 270 ?F max.
Alarm Current: 65 mA @ 24VDC 135 mA RMS @ 24VAC 60Hz 35 mA RMS @ 120VAC 60Hz