4098-9756 System Sensor Duct Detector Housing – HVAC Duct Mount Enclosure for Commercial & Industrial Fire Alarm Systems
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4098-9756 System Sensor Duct Detector Housing – HVAC Duct Mount Enclosure for Commercial & Industrial Fire Alarm Systems

$295.00

Specifications

The 4098-9756 is a Simplex-compatible duct sensor housing providing supervised multi-relay output and end-of-line resistor supervision for dependable HVAC auxiliary control when smoke is detected.

  • Model: 4098-9756 Duct Sensor Housing
  • Brand: System Sensor / Simplex-compatible
  • Type: Duct housing with supervised multiple-relay output
  • Included Relay: One 4098-9843 relay
  • EOL Requirement: 4081-9008 end-of-line resistor harness required
  • External Power: Separate 24 VDC fire alarm power required
  • Relay Supervision: Supervised relay output
  • Mounting: External duct-mount hardware
  • Compatibility: Simplex addressable panels with correct interface
  • Material: Thermoplastic housing
  • Application: Supervised HVAC shutdown circuits, multi-device aux control
  • Typical Use: Hospitals, schools, airports, large commercial HVAC systems

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4098-9756 System Sensor Duct Detector Housing – HVAC Duct Mount Enclosure for Commercial & Industrial Fire Alarm Systems
4098-9756 System Sensor Duct Detector Housing – HVAC Duct Mount Enclosure for Commercial & Industrial Fire Alarm Systems
$295.00

System Sensor Duct Detector Housing 4098-9756

The System Sensor Duct Detector Housing 4098-9756 is a supervised multi-relay duct housing engineered for Simplex platforms where onboard relay action plus supervised integrity reporting are both required. Unlike basic housings, the 4098-9756 includes a supervised multiple-relay output and ships with one 4098-9843 relay, plus it requires a separate 24 VDC fire alarm power source and the 4081-9008 end-of-line resistor harness for proper supervision. That makes it ideal for installations with stringent inspector requirements around HVAC shutdown circuits: every wire run is supervised end-to-end, and multiple auxiliary devices can be driven from one duct-mounted housing.

Features

  • Supervised multiple-relay output for robust HVAC shutdown control
  • Ships with one 4098-9843 relay included in the housing
  • Requires 4081-9008 end-of-line resistor harness for proper supervision
  • Separate 24 VDC fire alarm power input for relay operation
  • Compatible with System Sensor duct detection heads on Simplex platforms
  • Mounting layout designed for standard HVAC supply/return ducts
  • Supports expanded relay configurations for multi-device HVAC control

Benefits

The 4098-9756 exists because some projects simply cannot accept unsupervised auxiliary wiring on life-safety-adjacent HVAC circuits. By requiring the 4081-9008 end-of-line resistor harness and driving the relay through supervised outputs, this housing surfaces breaks, shorts, and miswires as panel troubles rather than silent failures. That compliance-driven supervision is especially valuable in hospitals, schools, airports, and high-occupancy commercial facilities where inspectors scrutinize HVAC shutdown paths. Because the housing ships with one 4098-9843 relay already included, integrators save a line item in the BOM and reduce risk of mismatched relay pairings. Ultimately, 4098-9756 buyers are buying peace of mind: they know the relay path itself is being watched.

Why Choose QuickShipFire?

  • Pre-verified inventory of 4098-9756 housings with compatible 4098-9843 relays
  • Kitting with 4081-9008 EOL resistor harnesses to prevent commissioning delays
  • Strategic support for engineers writing supervised HVAC shutdown specs
  • Bulk-order freight coordination for hospital and education rollouts
  • Straight answers about what this housing does and doesn’t include no guessing on receipt
Why does the 4098-9756 require the 4081-9008 EOL resistor harness?
The end-of-line resistor harness is what enables supervision of the relay output circuit. without it, the panel cannot properly detect opens or shorts on the auxiliary wiring.
Is the 4098-9843 relay included in the box?
Yes, the 4098-9756 ships with one 4098-9843 relay included; additional relays, if required by the project, must be ordered separately.
Can multiple auxiliary devices be driven from this housing's relay output?
The supervised multi-relay topology allows multiple devices to be controlled off the housing when properly wired, but ratings and load distribution must be verified against the relay's contact specs.
Does the housing draw power from the panel's communication loop?
The sensing side pulls loop power per the Simplex head's standard, but the relay function requires a separate 24 VDC fire alarm power input, as noted in the product description.
Is this a direct replacement for older Simplex duct housings?
Often yes in supervised-relay applications, but some older installs are relay-less and will need drawing revisions plus the EOL harness to migrate to the 4098-9756.
Where does the 4098-9756 commonly get specified?
It's frequently specified for hospital, educational, airport, and high-rise HVAC shutdown circuits where supervised auxiliary wiring is required by the local AHJ.
What happens if the EOL harness is damaged in the field?
A damaged harness will generally generate a supervisory trouble at the panel, which is by design. it flags the wiring integrity issue so maintenance can restore proper supervision.
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