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Intelligent Addressable Duct Smoke Detector



The E-PDD part number has been replaced by FX-PDD.  Products are otherwise identical.

  • Less than 2" deep for easy installation and applications where space is tight

  • 32 to 120 °F (0 to 50 °C) operating range with 100 ft/min. to 4,000 ft/min air velocity rating assures reliability under harsh environmental conditions

  • Status LEDs remain visible through clear assembly cover

  • Cover monitor switch for added security

  • Standard sampling tube spacing for easy drop-in migration from other detectors

  • Sampling tube can be installed with or without the cover in place and can be rotated in 45-degree increments to ensure proper alignment with duct airflow

  • 15.2 to 19.95 Vdc operation

  • Magnet-activated test switch

  • One Form C auxiliary alarm relay for controlling ancillary equipment (e.g., HVAC controls)

  • No special tools required for easy access to field connections

  • Environmental compensation with differential sensing for reliable, stable, and drift-free sensitivity

  • Wide 0.79% to 2.46% obscuration/ft. smoke sensitivity

  • Identification of dirty or defective detectors

Remote Test Stations
Labor-saving Remote Test/Reset stations provide alarm testing from the convenience of a remote location. Tests can be performed quickly and safely – without having to climb to the roof. Magnetically-operated and key-operated one-gang models are available. FX-PDD detectors are also compatible with R-LED remote alarm LED.

Air velocity in the duct as low as 100 ft/min. maintains adequate air flow into the sensor smoke chamber through air holes in the air sampling tube and discharges through the exhaust tube. Air sampling tubes must be installed with the inlet holes facing the airstream. Sampling tubes may be rotated in 45-degree increments so that air-holes can be aligned to allow the unit to be mounted in virtually any angle relative to the airflow.

FX-PDD sensors are engineered to operate optimally under the harsh environmental conditions frequently found in HVAC ductwork. Nonetheless, before installing the detector, test the duct air velocity, temperature, and humidity to verify that it is within the operating range of the detector. Consult the FX-PDD installation sheet for details.

Intelligent Addressable Duct Smoke Detector

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Catalog Numbers

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Catalog Number

Intelligent Duct Detector


Air Sample Tube - 8 Inch


18-inch sampling tube


Air sample tube - 24 inch


36-inch sampling tube


Air sample tube - 42 inch


Air sample tube - 78 inch


Air sample tube - 120 inch


Protective housing for high humidity environments


Remote test station, magnetic


Remote test station, keyed


Air velocity test kit (stoppers, etc)


Test magnet kit




Agency Approvals

  • UL Listed

  • ULC Listed

  • CSFM Listed



Detector Specifications

  • Communication line voltage: Maximum 20 V peak-to-peak
  • Operating current:
    • Normal: 45 ìA
    • Alarm: 45 ìA
    • Inrush: 1 mA
  • Common alarm relay/auxiliary equipment: Unsupervised and power-limited Quantity: 1 Type: Form C Rating: 2.0 A at 30 VDC (resistive)
  • Air velocity: 100 to 4,000 ft./min
  • Air pressure differential: 0.005 to 1.00 inches of water
  • Smoke sensitivity range: 0.79 to 2.46%/ft. obscuration
  • Smoke detection method: Photoelectric (light scattering principle)
  • Alarm test response time: 5 seconds
  • Dimensions: 8.70 x 5.45 x 1.90 inches
  • Operating environment:
    • Temperature: 32 to 120 °F (0 to 50 °C)
    • Humidity: 0 to 93% RH, noncondensing
  • Wire size: 14 to 22 AWG wire
  • Detector address
    • 01 to 64 (64 point control panel)
    • 01 to 127 (127 point control panel)
  • Accessories:
    • Remote test-reset station, magnetic: SD-TRM
    • Remote test-reset station, keyed: SD-TRK
    • Test magnet: SD-MAG
    • Air velocity test kit: SD-VTK
    • Remote LED alarm indicator: R-LED

Test station specifications
Remote Test/Reset Stations provide alarm test, trouble indication, and reset capability from a remote location. They include a one-gang plate, momentary SPST switch, red alarm LED, and terminal block. Magnetically-operated models (TRM) or key-operated models (TRK) are available.

  • Compatible electrical boxes:
    • North American 1-gang box
    • Standard 4-in square box, 1-1/2 inches deep, with 1-gang cover
  • LED indicators: Alarm (red)
  • LED type: Clear lens
  • Wire size: 14 to 22 AWG
  • Resistance per wire: 10 Ohms, max.
  • Current requirements: See controller specifications
  • LED circuit ratings: Voltage: 3 Vdc, max. Current: 30 mA, max.
  • Switch ratings (SD-TRK): Voltage: 125 Vdc, max. Current: 4 A, max.
  • Switch ratings (SD-TRM): Voltage: 200 Vdc, max. Current: 0.5 A, max.
  • Operating environment:
    • Temperature: 32 to 120 °F (0 to 50 °C)
    • Humidity: 93% RH, noncondensing
  • Storage temperature-: 4 to 140 °F (-20 to 60 °C)


Data Sheets
Fire Alarm Sales Tools
Installation Instructions
Technical Bulletins