Duct Sensor Housing Basic 4098-9755
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4098-9755 Simplex Duct Sensor Housing Basic – HVAC Duct Mount Enclosure for Smoke Detectors in Commercial Buildings

$265.00

Specifications

The 4098-9755 is a no-relay basic duct sensor housing for Simplex fire alarm systems, drawing operating power from IDNet or MAPNET II communications for simple, clean HVAC duct detection installs.

  • Model: 4098-9755 Basic Duct Sensor Housing
  • Brand: Simplex
  • Type: Basic no-relay duct housing
  • Communication: IDNet or MAPNET II (powers the housing)
  • Relay Output: None
  • Power Source: Operating power from the communication loop
  • Compatibility: Simplex addressable panels (IDNet/MAPNET II)
  • Sampling Infrastructure: Standard Simplex sampling tube accessories
  • Mounting: External duct-mount hardware
  • Typical Use: Commercial HVAC supply and return air ducts
  • Housing Material: Thermoplastic
  • Application: Office, retail, education, healthcare HVAC systems

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Duct Sensor Housing Basic 4098-9755
4098-9755 Simplex Duct Sensor Housing Basic – HVAC Duct Mount Enclosure for Smoke Detectors in Commercial Buildings
$265.00

Duct Sensor Housing Basic 4098-9755

The 4098-9755 is Simplex’s basic duct sensor housing engineered for straightforward HVAC smoke detection deployments where no onboard relay output is required. Operating power is supplied directly by either IDNet or MAPNET II communications, which keeps installation clean and simplifies wiring on addressable Simplex systems. Because there’s no relay circuit inside the housing, the 4098-9755 is especially useful when relay-driven actions (fan shutdown, damper movement) are handled elsewhere on the system – for example, via a panel-side relay module. Its clean, no-frills design makes it a dependable choice for large-volume duct detection projects in commercial and institutional buildings on Simplex platforms.

Features

  • Basic duct housing designed for IDNet or MAPNET II powered sensing
  • No relay output streamlined, no-extra-wiring footprint
  • Compatible with Simplex duct detection heads and sampling accessories
  • Clean internal layout simplifies sampling tube installation
  • Optimized for standard commercial HVAC airflow applications
  • Low-complexity mounting for mechanical rooms and ceiling plenums
  • Consistent operation across Simplex legacy and modern panels

Benefits

The 4098-9755’s chief advantage is simplicity. Because it has no relay, it’s smaller in electrical footprint, simpler to wire, and easier to document on a project drawing set a genuine benefit for large addressable systems with dozens of duct detection points. Drawing power from IDNet or MAPNET II eliminates the need for a dedicated 24 VDC feed to each detector, reducing conduit runs and accelerating commissioning. When relay-driven HVAC control is required elsewhere on the network, the 4098-9755 lets engineers centralize that logic on the panel side, which improves serviceability and standardizes fault diagnostics. For Simplex-standard facilities, it’s a cost-aware workhorse.

Why Choose QuickShipFire?

  • Dedicated stock of the 4098-9755 for Simplex-centric commercial replacement work
  • Help distinguishing when the 4098-9755 fits versus when a relay-equipped 4098-9756 is needed
  • Cross-referenced sampling-tube lists so your duct width is matched on the first order
  • Bulk-order pricing for multi-floor retrofits moving from older duct detectors
  • Rapid support from real fire safety pros handy when a panel revision complicates compatibility
1. What's the main design difference between the 4098-9755 and the 4098-9756?
The 4098-9755 has no relay output and draws power from the communication loop; the 4098-9756 includes a supervised multiple-relay output and requires a separate 24 VDC feed.
2. Is the 4098-9755 compatible with both IDNet and MAPNET II systems?
Yes, the housing is designed to draw operating power from either communication bus type, making it useful across modern and legacy Simplex installations.
3. How do I trigger fan shutdown without a relay in the housing?
Use a panel-side addressable relay module mapped to the detector's address; the panel then drives the fan contactor on alarm, centralizing relay logic.
4. Do I still need a separate 24 VDC supply for the 4098-9755?
No. Because the housing is powered entirely by the IDNet or MAPNET II communication circuit, no additional 24 VDC feed is required.
5. Is this housing suitable for return-air plenum detection?
Yes, as long as airflow conditions and duct width match the sampling tube configuration, the 4098-9755 is commonly used on both supply and return paths.
6. Can I add a relay later if the project scope changes?
The 4098-9755 cannot be field-converted to a relay housing the typical path is to either swap to a 4098-9756 or add a panel-side relay module for the same address.
7. Is there a test mechanism built into the 4098-9755?
Testing is performed per Simplex's standard duct detector test procedures using the installed detector head and appropriate sampling tools; refer to the current Simplex service literature for specifics.
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