Simplex 4098-9756


Duct Sensor Housing with supervised multiple relay output, requires separate 24 VDC fire alarm power and 4081-9008 end-of-line resistor harness; includes one 4098-9843 relay

Available with Lead Time

  • Factory New
Brand: Simplex Part #: 004879 Categories: , Manufacturer Part #: 4098-9756 Tags: ,


Simplex® compact air duct smoke sensor housings provide TrueAlarm operation for the detection of smoke in air conditioning or ventilating ducts. Sampling tubes are installed into the duct allowing air to be directed to the smoke sensor mounted in the housing.


Weight 2.50 lbs
Dimensions 3.375 × 6.75 × 11.375 in




Detection Method

Product Notes

Includes factory installed 4098-9714 Photoelectric Sensor.


  • UL listed to Standard 268A
  • Clear cover allows a visual inspection
  • Test ports provide functional smoke testing access with cover in place
  • Mounts to rectangular ducts or round ducts; minimum size is 8″ (203 mm) square or 18″ (457 mm) diameter
  • Magnetic test feature for alarm initiating at housing
  • Optional weatherproof enclosure is available separately (refer to data sheet S4098-0032)


TrueAlarm Analog Sensing; Addressable Duct Sensor Housings with TrueAlarm Photoelectric Sensor
Simplex – Data Sheet
Duct Detector/Sensor; 4098-9685, -9686, -9688, -9755, -9756
Simplex – Installation Instructions


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