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

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

The SD505-DUCTR Addressable Duct Smoke Detector and Housing with Relay is a heavy-duty, fully equipped duct detection assembly that pairs a factory-installed SD505-APS photoelectric head with a built-in relay specifically engineered to drive auxiliary HVAC control actions such as fan, blower, and damper shutdown when smoke is detected in the ductwork. This version is ideal for installations where code or engineering practice requires an at-the-detector relay for immediate HVAC reaction, rather than routing control logic through a separate panel-side module. It brings early smoke detection, intelligent addressable communication, and integrated mechanical control into a single-SKU package.

Features

• Built-in relay for direct HVAC shutdown of fans, blowers, and dampers
• Factory-installed SD505-APS addressable photoelectric head
• Heavy-duty duct housing for long-life HVAC operation
• Addressable communication for precise alarm location
• Built-in cover test/reset button for faster inspections
• Remote testing capability for high-mount or ceiling-concealed ducts
• Pivoting housing accommodates round or rectangular ducts

Benefits

The integrated relay inside the SD505-DUCTR solves one of the most common coordination headaches in HVAC fire safety getting the fan or damper to react promptly when smoke is confirmed in the duct. Because the relay sits inside the housing, wiring to the controlled mechanical device is shorter and more straightforward than routing through a separate panel module. That reduces installation labor and simplifies the as-built drawing. For facility operations, fewer separate devices means fewer points to maintain and troubleshoot. And because the SD505-APS head is addressable, when the assembly does trip, the panel reports the exact duct run in alarm critical on large rooftop units serving multiple zones.

Why Choose QuickShipFire?

• Stock of SD505-DUCTR assemblies for projects with mandatory at-detector relay control
• Help specifying conductor sizing for the auxiliary relay run to fans/dampers
• Guidance on relay contact ratings vs. HVAC contactor coil requirements
• Bundled quoting with matching sampling tubes sized to your duct widths
• Fast availability for remodels where inspector sign-off hinges on relay-at-duct operation

The SD505-Duct Smoke Detector and Housing is a heavy-duty duct housing that arrives with the SD505-APS addressable photoelectric smoke detector pre-installed a factory-matched unit engineered to detect smoke and products of combustion inside HVAC air-handling systems. It’s designed for early smoke detection in supply and return ducts, delivering intelligent addressable communication so the fire alarm panel can pinpoint the exact location of activity. Built-in cover test/reset functionality and remote testing capability streamline inspection routines, while stable operation across airflow ranges from 300 to 4,000 ft/min makes it a dependable choice for a wide span of commercial and institutional HVAC layouts.

Features

• SD505-APS addressable photoelectric head pre-installed from the factory
• Heavy-duty housing built for sustained HVAC duty cycles
• Early smoke detection for HVAC supply and return air handling
• Intelligent addressable communication for precise location reporting
• Built-in cover test/reset button for quick manual diagnostics
• Remote testing capability for hard-to-reach duct locations
• Stable operation across 300–4,000 ft/min airflow

Benefits

Ordering the SD505-Duct instead of a housing-plus-head-separate configuration saves procurement and install time — the assembly arrives pre-matched, factory-installed, and ready to mount. The SD505-APS head’s intelligent addressable reporting means dispatched technicians know exactly which duct run is in alarm, which shortens mean time to response in large buildings with many detection points. Wide airflow tolerance (300–4,000 ft/min) removes one of the classic install worries on older buildings with variable HVAC performance. Remote testing capability is a quiet but meaningful maintenance win: inspections happen faster, which keeps the facility compliant without disrupting tenants.

Why Choose QuickShipFire?

• Factory-assembled SD505-Duct units stocked for faster job turnaround
• Technical cross-checks against your panel firmware before shipment
• Coordinated freight for large-format duct detector orders on tight schedules
• Pairing recommendations with sampling tubes sized to your duct widths
• Honest compatibility feedback we’ll tell you if an alternate assembly fits better

The DNRW Watertight Duct Housing is a System Sensor non-relay photoelectric low-flow duct smoke housing designed for installations where moisture, wash-down, or outdoor exposure is a real concern. Unlike standard indoor-rated duct housings, the DNRW is built with a watertight enclosure that protects the detector head and sampling infrastructure from water ingress, condensation, and incidental splashing critical for rooftop HVAC units, parking-garage exhaust runs, food-service extract ducts, and outdoor air-handler plenums. The detector head is sold separately, giving integrators flexibility to pair the DNRW with the correct compatible photoelectric sensor for their host fire alarm platform.

Features

• Watertight housing construction for harsh-environment duct protection
• Non-relay design keeps the housing compact and focused on sensing
• Low-flow photoelectric sensing compatibility for modern HVAC airflow ranges
• Detector head sold separately for platform-specific pairing flexibility
• Durable exterior suitable for rooftop and outdoor duct installations
• Integrated sampling tube connections for conventional ducts
• Intelligent operation when paired with compatible addressable detector heads

Benefits

Choosing the DNRW over a standard indoor duct housing translates into real reliability gains in outdoor-exposed mechanical systems. Rooftop units, underground parking exhausts, and foodservice ducts experience temperature swings and moisture loads that cause standard housings to develop nuisance troubles or corrode internal electronics. The DNRW’s watertight construction protects both the detector head and the sampling chamber, extending service life and reducing unplanned maintenance calls. Because the head is sold separately, integrators can select the exact intelligent head that matches their fire alarm protocol, there’s no hardware overspecification. For facility owners with outdoor mechanical plants, the DNRW helps ensure duct-side detection survives the weather the rest of the rooftop does.

Why Choose QuickShipFire?

• Specialty stocking of DNRW housings that regional distributors often don’t keep on hand
• Paired-quote support we’ll list compatible detector heads alongside the housing
• Guidance on rooftop and outdoor install hardware and sampling-tube options
• Fast turnaround for projects already behind on weatherproof duct detection work
• Practical advice on when the DNRW is right vs. a standard indoor DNR housing

The DNR-AUS Intelligent Photoelectric Duct Detector is a System Sensor InnovairFlex-series device engineered to deliver dependable smoke detection inside HVAC duct systems. Built around advanced low-flow photoelectric technology and a pivoting housing that fits both round and rectangular ducts, it performs accurately across airflow speeds from 100 to 4,000 ft/min (0.5–20.32 m/s). The front-cover test/reset button, patented tool-free plug-in sampling tubes, and spacious interior with a ¾-inch conduit knockout make it contractor-friendly to install, service, and upgrade. UL Listed, FM Approved, and CSFM Certified, the DNR-AUS is a benchmark choice for commercial and industrial duct applications.

Features

• Low-flow photoelectric smoke detection for accurate HVAC monitoring
• Pivoting housing fits round or rectangular ducts in square/rectangular footprints
• Wide operating airflow range: 100 to 4,000 ft/min
• Front-cover test/reset button for in-field service convenience
• Tool-free patented plug-in sampling tubes (front or back install)
• Cover tamper detection issues trouble signal on cover removal
• Communication-line powered, no extra power wiring required

Benefits

The DNR-AUS is purpose-built to eliminate the chronic pain points of duct smoke detection namely false trips from low airflow, awkward installs on tight mechanical rooms, and hard-to-reach test/reset workflows. Because the sensing technology is optimized down to 100 ft/min, it reliably detects smoke in variable-air-volume systems that would challenge older detectors. The tool-free sampling tubes save field time on long duct runs, and the pivoting housing means installers don’t need to pre-orient the housing before mounting. Facility teams benefit from the cover tamper feature, which flags accidental service lapses automatically. For engineers specifying large rooftop units, VAV systems, and return air plenums, the DNR-AUS delivers certified performance and simpler lifecycle maintenance.

Why Choose QuickShipFire?

• Ready sourcing of InnovairFlex DNR-AUS units for HVAC-heavy commercial projects
• Pairing guidance for matching sampling tube lengths to duct widths
• Optional addressable relay module pre-quoted alongside the detector for Form C needs
• Same-day dispatch support for mechanical contractors with tight HVAC commissioning windows
• Experienced help with converting older relay-duct detectors to modern InnovairFlex units