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SD505-DUCTR Addressable Duct Smoke Detector with Relay – HVAC Duct Mount Fire Sensor for Fan Shutdown in Commercial Buildings

$1,495.00

Specifications

The SD505-DUCTR is an analog addressable duct detector assembly with an integrated relay, engineered to detect HVAC smoke and immediately shut down fans, blowers, or dampers on alarm.

  • Model: SD505-DUCTR
  • Brand: Silent Knight (Honeywell Farenhyt)
  • Type: Analog addressable duct detector with integrated relay
  • Pre-installed Head: SD505-APS photoelectric sensor
  • Relay Function: Drives HVAC auxiliary devices (fans, blowers, dampers)
  • Power Requirements: 24 VDC, loop-powered
  • Alarm Current: 62 mA
  • Airflow Range: 300 – 4,000 ft/min (1.5 – 20.3 m/s)
  • Operating Temperature: 32°F to 120°F (0°C to 49°C)
  • Mounting: Pivoting housing for round or rectangular ducts
  • Certifications: UL Listed for duct applications
  • Testing: Built-in cover test/reset + remote-test ready

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SD505-DUCTR Addressable Duct Smoke Detector
SD505-DUCTR Addressable Duct Smoke Detector with Relay – HVAC Duct Mount Fire Sensor for Fan Shutdown in Commercial Buildings
$1,495.00

SD505-DUCTR Addressable Duct Smoke Detector and Housing with Relay

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
1. What HVAC devices can the SD505-DUCTR relay directly control?
The onboard relay is designed to shut down fans, blowers, dampers, and similar auxiliary HVAC equipment when a duct smoke alarm is detected.
2. Does the relay require its own 24 VDC source?
The assembly is loop-powered for its detection function; the relay contacts themselves are dry contacts that switch the customer's auxiliary control circuit, which has its own power.
3. When should I choose SD505-DUCTR over the relay-less SD505-Duct?
Pick the DUCTR when fan/damper shutdown must happen at the detector; choose the SD505-Duct when relay logic is handled elsewhere on the network.
4. Can the relay also be used to start an exhaust fan on alarm?
Yes, a relay configured as normally open can be used to energize an exhaust fan contactor on alarm; the integrator should confirm contact ratings against the inrush requirements.
5. Is the relay supervised by the host fire alarm panel?
The device is addressable, so alarm and trouble reporting are supervised at the panel level; relay contact status itself is typically reported based on the panel configuration.
6. How does the SD505-DUCTR behave on power loss to the HVAC control circuit?
Loss-of-power behavior depends on whether the auxiliary circuit is wired to the normally open or normally closed contacts; this is defined by the HVAC designer at commissioning.
7. Does the integrated relay affect the airflow sensing performance?
No, The relay is separate from the sensing path, so airflow detection performance matches the standard SD505-Duct across the same 300–4,000 ft/min range.
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