Conventional Duct Detectors

Waterproof 4-Wire Photoelectric Duct Smoke Detector

Product Overview

The 4-Wire Photoelectric Duct Smoke Detector (D4120W) features a waterproof housing providing protection against falling dirt, rain, windblown dust, splashing and hose directed water.

The D4120W duct smoke detector features a pivoting housing that provides optional square or rectangular footprints, suitable for round or rectangular ductwork.

This unit senses smoke in the most challenging conditions, operating in airflow speeds of 0.5 m/s to 20.32 m/sec, temperatures of –20 °C to 70 °C and a humidity range of 0 to 95 % (non condensing).


  • NEMA Type 4 housing
  • 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: square or rectangular configuration
  • Plug-in sensor offers superb false alarm immunity and the latest sensor technology
  • Broad ranges for operating temperature (–20 °C to 70 °C) and humidity (0% to 95% non-condensing)
  • Patented sampling tube installs from front or back of the detector with no tools required
  • Increased wiring space with a newly added ¾-inch conduit knockout
  • 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
  • Auxiliary relay with two Form C (change-over) contacts
  • 24 Vac/dc or 120 Vac
  • Backward compatible with existing Innovair products, including remote accessories

Click here to download the white paper: Duct Application Smoke Detectors

Ordering Information

Product Code



Conv 4 Wire Photo Duct Detector. 24VAC/DC & 120VAC w/Relay Waterproof No Tube