Simplex (4098-9686) TrueAlarm Duct Detector Housing 0631139

Original price was: $275.00.Current price is: $235.00.

1 in stock


Simplex (4098-9686) TrueAlarm Duct Detector Housing 0631139

New: A brand-new, unused, undamaged item in its original packaging.

4098-9686, 4-Wire operation with supervised control for multiple remote relays (includes one remote relay)
Compact air duct detector housing with clear cover to monitor for the presence of smoke
Includes factory installed TrueAlarm photoelectric smoke detector and features:
– On-board TrueAlarm sensitivity drift compensation and dirt accumulation tracking
– Multi-function status LED indicator
– Magnetic test that initiates an alarm and provides detailed diagnostic information
– Clear cover allowing visual inspection
– Test ports provide functional smoke testing access with cover in place
– UL listed to Standard 268A
4-Wire Model 4098-9686 provides a supervised relay control output that can control up to 15, 4098-9843 control relays. Relay supervision troubles are indicated by a yellow LED on the interface board. (Resettable 24 VDC is required) Remote test station 4098-9835 is available for use with this model to provide a test keyswitch, a red LED alarm indicator and a green power-on LED.

General Mechanical & Environmental:
Air Velocity Range (linear ft/min): 300 to 4000 ft/min (91 to 1220 m/min)
UL Listed Temperature Range: 32° F to 100° F (0° C to 38° C)
Operating Temperature Range: 32° F to 122° F (0° C to 50° C)
Storage Temperature Range: 0° F to 140° F (-18° C to 60° C)
Humidity Range: 10% to 95% RH, non-condensing
Wiring Connections: Terminal blocks, 18 to 12 AWG (0.82 mm2 to 3.31 mm2)
Housing Color: Black base with clear cover

Four-Wire Operation, Model 4098-9686, Requires Resettable and Fused 24 VDC from Fire Alarm Power Supply
Operating Voltage: 18-32 VDC (24 VDC nominal)
Standby Current: 12 mA @ 24 VDC; 32 mA @ 24 VDC with 4098-9835 Test Station
Alarm Current (one relay activated):
– 45 mA @ 24 VDC; 65 mA @ 24 VDC with 4098-9835 Test Station
– Add 15 mA @ 24 VDC for each additional remote 4098-9843 relay
Brand: Simplex
SKU: 4098-9686

The Simplex (4098-9686) TrueAlarm Duct Detector Housing 0631139 is a component in fire alarm systems, specifically designed to house duct smoke detectors. These detectors are essential for detecting smoke present in the HVAC ductwork of buildings, playing a critical role in early fire detection and safety systems.

Product Specifications:

  • Manufacturer: Simplex
  • Model Number: 4098-9686
  • Part Number: 0631139
  • Type: TrueAlarm Duct Detector Housing
  • Compatibility: Designed to work with specific Simplex smoke detectors that fit within this housing unit.
  • Material: Typically constructed from durable, fire-resistant materials suitable for installation in HVAC systems.
  • Features: Includes features necessary for secure and effective placement of smoke detectors within the HVAC ducts.


  • Smoke Detection in HVAC Systems: Ensures that smoke is detected within the ductwork, an essential safety measure to prevent the spread of smoke and fire through air handling systems.
  • Early Fire Detection: Provides critical early warning by detecting smoke in the air ducts before it spreads to other areas.


  • Enhanced Safety: Plays a vital role in enhancing building safety by detecting smoke in areas that are not easily accessible or visible.
  • Compatibility with Simplex Systems: Designed to integrate seamlessly with other Simplex fire alarm components, ensuring reliable performance and ease of integration.
  • Durable Construction: Made with materials that can withstand harsh conditions often found in duct environments.


  • Installation Complexity: Installation might require professional expertise due to the complexities of working within HVAC systems.
  • Maintenance Requirements: Regular maintenance and testing are required to ensure optimal functioning, which can incur additional costs.


  • Professional Installation Required: Due to the technical nature and critical safety implications, professional installation by a qualified technician is recommended.
  • Integration with Fire Alarm System: Must be integrated into the existing fire alarm system, requiring careful planning and execution.
  • Access and Placement: Placement within the ductwork must ensure optimal smoke detection while allowing for maintenance and testing.

Comparison with Other Brands:

When comparing the Simplex TrueAlarm Duct Detector Housing with other brands like Honeywell or System Sensor, consider factors such as compatibility with your existing fire alarm system, ease of installation, maintenance requirements, and cost. Simplex is known for its reliability and integration capabilities in more complex fire alarm systems.

Related Items:

  • Smoke detectors compatible with the housing
  • Installation tools and hardware
  • Replacement filters and maintenance kits for detectors


Simplex is a registered trademark. The mention of Simplex and any part numbers is for descriptive purposes only and does not imply any affiliation with or endorsement by Simplex.


Weight 4 lbs
Dimensions 13 × 11 × 7 in


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