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Beam & Duct Smoke Detectors for Fire Alarm Systems


  Commercial Products Group DH604 - 4-Wire Air Duct Smoke Detector
Commercial Products Group DH604 - 4-Wire Air Duct Smoke Detector


Our Price : $248.96

Product Code: CPGDH604




  • Approvals/Listing
    • UL 268A Listed File S1064
    • Factory Mutual Approved
    • CSFM Listed #3240-1076:121
    • NYC MEA Listed #134-95-E
    • City of Los Angeles Approved #RR8318
  • 24/120/240 VAC or 24 VDC Operation
  • Compatible with Fenwal Advanced Smoke Detectors
  • In-place Sensitivity Measurement (in % per foot obscuration)
  • Remote Indication, Test and Reset Capabilities
  • Easily Mounts to Round or Rectangular Ducts
  • Wide Range of Duct Sizes and Air Velocities
  • High Capacity Form C Alarm Relay Contacts
  • Clear Lexan Cover for Easy Viewing of Smoke Detector Status and Cleanliness


        The Fenwal Series DH-60 Air Duct Smoke Detector is designed for detecting particles of combustion in air handling systems. The DH-60 Duct Detector housing accepts the Fenwal Advanced CPD-7054D Ionization and PSD-7157D Photoelectric Smoke Detector Heads. Upon detection of smoke levels at the set point of the detector, the DH-60 Duct Detector can control a variety of devices, such as HVAC fans and dampers to prevent the spread of smoke throughout the facility.
  • High amperage relay contacts are provided for controlling such devices in the event of a fire. Supervisory contacts are also provided for signaling unit faults. A transparent Lexan cover over the detection chamber allows visual inspection of the duct detector’s chamber and the internal smoke detector status. Sampling is accomplished by sampling tubes that extend into the HVAC duct.

  • The DH-60 Duct Detector can operate as a 24 VAC, 120 VAC or 240 VAC powered stand-alone device or as a 4-wire 24 VDC powered device for use with Fire Alarm Control Panels. An integral normally energized trouble relay is used to supervise power and smoke detector head removal. Outputs provided can accommodate remote alarm and power indication, remote test and remote reset. Fenwal offers a range of remote accessories that operate in conjunction with the duct detectors. Figure 1 is a simplified parts breakdown of the DH-60 Air Duct Smoke Detector.

    The Fenwal Series DH-60 Duct Detectors are suited for use with HVAC systems in commercial, industrial and institutional fire alarm applications.The DH-60 is easily mounted to both rectangular and round ducts from 8 inches (200 mm) to 12 feet (3.6 m) wide and is compatible with all ducts with air velocities between 500 and 4000 feet per minute (2.5 to 20 m/s). The Ionization and Photoelectric Smoke Detector heads listed above operate over this entire air velocity range.


    The operation of the DH-60 Duct Detector is based upon an air sampling principle. Two tubes extend into the HVAC duct to transport air from inside the duct into the duct detector sensing chamber and back out to the duct. If the sampled air contains a concentration of smoke greater than or equal to the alarm threshold of the internal smoke detector, the unit will alarm. The duct detector inlet supply sampling tube is selected according to the size of the HVAC duct. A separate exhaust tube is not required since an integral tube is molded into the housing to simplify installation.


    A series of easily installed remote indicators are available to add versatility and flexibility to the Fenwal Series DH-60 Duct Detectors. These attractive and functional devices provide convenient status information along with remote Test/Reset capabilities. The remote indicators are helpful when the detector is out of view or mounted in relatively inaccessible locations. The remote indicators can be used in both AC and DC applications. Figure 2 shows the faceplates of the RA-911, RA-912 and RA-913 remote indicator controls.


    The Fenwal DH-60 Duct Detectors should be tested upon installation and once a year thereafter as stated in NFPA 72. All alarm signal devices, releasing devices, and extinguishing systems, as applicable should be disengaged before the test is performed and re-engaged at the conclusion of testing.The DH-60 Duct Detector may be functionally tested either by introducing smoke into the detector or activating the magnet test.
  •  Two separate magnet-locating slots are provided on the outside of the duct detector housing.Further, as stated in NFPA 72, Detector sensitivity should be checked within one year of installation and every alternative year thereafter. Fenwal offers the Model DST-003 handheld wireless infrared sensitivity tester that allows the sensitivity of installed operating detectors to be measured from the floor level. For details, please refer Fenwal Document 70.103.

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