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Duct Smoke Detectors

National and local safety standards and codes recognize the ability of air duct systems to transfer smoke, toxic gases, and flame from area to area. Sometimes smoke can be of such quantity as to be a serious hazard to life safety unless blowers are shut down and dampers are actuated. The primary purpose of duct smoke detection is to prevent injury, panic, and property damage by reducing the spread (recirculation) of smoke. The detector samples air currents passing through a duct and gives dependable performance for management of smoke and combination fire smoke dampers. Duct smoke detection can also serve to protect the air conditioning system itself from fire and smoke damage. smoke detector

Honeywell HFS-D, Addressable Non-Relay P/E Duct Detector

• ETL listed to UL 864, ULC 527, and ULC 559
• Photoelectric, integrated low-flow technology (HFS-DPR detector head included)
• Air velocity rating from 100 ft/min to 4000ft/min (0.5m/s to20.32m/sec)
• Versatile mounting options: square or rectangular configuration
• Broad ranges 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
• Cover tamper signal
• Increased wiring space with a newly added 3/4-inch conduit knockout
• Available space within housing to accommodate mounting of relay module
• Easily accessible code wheels on sensor head
• Clear cover for convenient visual inspection
• UL 268A listed
• Remote testing capability
• Requires com line power only
duct smoke sensorThe HFS-D is flexible enough to fit mounting configurations from square to rectangular and everything in between.

The HFS-D intelligent non-relay photoelectric duct smoke detector features a pivoting housing that fits both square and rectangular footprints capable of mounting to a round or rectangular duct. This unit senses smoke in the most challenging conditions, operating in airflow speeds of 100 to 4000 feet per minute, temperatures of -4°F to 158°F, and a humidity range of0 to 95 percent (non-condensing).

An improved cover design isolates the sensor head from the low-flow feature for simple maintenance. A cover tamper feature was added to indicate a trouble signal for a removed or improperly installed sensor cover. The housing provides a 3/4-inch conduit knockout and ample space to facilitate easy wiring and mounting of the HFS-MR relay module.

The HFS-D can be customized to meet local codes and specifications without additional wiring. The new HFS-D is compatible with various remote test accessories.

Duct Smoke Sensor KRM Honeywell

VdS certification (G210059)
• Patented single tube air sampling system
• Contamination display in % and signaling at 100%
• Electronic air flow control
• Externally operable reset button in the housing
• Remote reset option via terminals
• Long service life, low contamination


The KRM duct smoke detector is designed for smoke detection in ventilation ducts. It constitutes a combination of a smoke detector with an adapter system, whose measuring tube and housing have been specially adapted for optimal air flow through the smoke detector. The multi-chamber measuring tube in the air duct transports the air within the air duct along the entire length of the tube, through the sensing chamber and back into the air duct. Upon detection of smoke, the sensor reacts immediately and triggers an alarm.

Over time, the sensor becomes contaminated. Because of alarm threshold tracking, the sensitivity up to total pollution remains the same. From 70% contamination upwards, the sensor is triggered and indicates this by flashing. If the sensor is not replaced the smoke alarm is triggered at 99% contamination. The contamination level is indicated in a two-line LED display; at > 70% it flashes. To verify operability, the device is equipped with electronic air flow monitoring, hich lights a blue LED at < 1 m/s.

The failure LED illuminates when the smoke sensor or the electronics are defective, in the absence of a smoke sensor, and with short-circuits or cable breakage. The smoke alarm must be released with the reset button. A functionality test is also possible with the same button. The operation functions like a smoke alarm. Furthermore, the same function takes place on restart or when the bridge circuit between terminals 9 and 10 is opened (remote release).


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