System Sensor 2D51 InnovairFlex Intelligent Plug-In Duct Detector
System Sensor 2D51 InnovairFlex Intelligent Plug-In Duct Detector
System Sensor 2D51 InnovairFlex Intelligent Plug-In Duct Detector
Product images are provided for reference and may not represent the exact model, configuration, or included components.

No Bots, Just Experts

Questions about this product? Free pre-sales support from a senior specialist — product questions, compatibility checks, BOM quotes, price confirmation — typically answered within one business day. Need camera placement or system design work? Engineering time is $175 per hour (qty 1 = 1 hour). Hardware buyers get up to one hour ($175) credited back on their order.

Get Free Pre-Sales Support Buy Design Hours ($175/hr)
Description

System Sensor 2D51 Intelligent Plug-In Duct Detector

Overview

The System Sensor 2D51 InnovairFlex is an addressable intelligent duct detector designed for integration into fire detection and alarm systems. This plug-in detector monitors air handling ducts for smoke detection, delivering addressable communication capability for precise system identification and diagnostics. The compact form factor accommodates standard duct installations while maintaining reliable detection performance.

Compatibility

Operates on 29VDC and communicates via addressable protocol, making it compatible with fire alarm control panels and intelligent detection networks that support addressable device communication. Suitable for HVAC duct applications in commercial and institutional buildings where early smoke detection in air distribution systems is required.

Specifications

  • Dimensions: 14.38 in L × 5 in W × 2.5 in D
  • Weight: 2.5 lbs
  • Voltage: 29VDC
  • Communication: Addressable
Expert Analysis
Specifications
Product Type: Intelligent Plug-In Duct Detector
Communication: Addressable
Dimensions: (Rectangular Dimensions) 14.38 in (37 cm) Length; 5 in (12.74 cm) Width; 2.5 in (6.36 cm) Depth
Weight: 2.5 lbs (1.14 kg)
Voltage: 29VDC
Type: Intelligent Plug-In Duct Detector
Warranty: Manufacturer Warranty
Package Contents: current draw from attached detectors or EOL relay.; **Does not include reverse polarity current draw from attached detectors.; 100 Series™ Plug-In Smoke Detectors and Bases
Analytics: Smoke Detection
Mount Type: Pendant
Operating Temp: Range -4˚F to 158˚F (-20˚C to 70˚C)
Mounting: 4-inch square box, 1.5 in min depth
weight: 0.19
Operating System: Y2 Used to monitor the open position of an 1 in. to 12 in. 10 A @ 125/250 VAC; —
Q&A
Reviews
Product Video
Have Questions?

System Sensor 2D51 InnovairFlex Intelligent Plug-In Duct Detector

$136.42
$135.99
Add to Cart

RELATED PRODUCTS

Save $8.53
System Sensor DST3 InnovairFlex Sampling Tube - 2 to 4 Foot Duct
Add to Cart The item has been added

System Sensor DST3

System Sensor DST3 InnovairFlex Sampling Tube - 2 to 4 Foot Duct

Duct sampling tube for 2–4 ft runs, TCP/IP integrated, 29VDC

  • Covers 2–4 ft duct runs at 29VDC, eliminating extra detector heads per zone.
  • Supports air velocities 100–4,000 ft/min, matching standard commercial HVAC ranges.
  • Tool-free front or back install via ¾-in conduit knockout cuts deployment time.
Usually Ships in 2-3 Weeks Free shipping over $499
$29.52 $20.99 Save $8.53
Add to Cart
The item has been added Add to quote
$29.52 $20.99 Save $8.53
Save $8.53 Add to cart Add to quote
Save $25.40
System Sensor DST10 InnovairFlex Sampling Tube - 8 to 12 Foot Duct
Add to Cart The item has been added

System Sensor DST10

System Sensor DST10 InnovairFlex Sampling Tube - 8 to 12 Foot Duct

Aspirating smoke sampling tube for 8–12 ft ductwork runs with TCP/IP

  • Covers 8–12 ft duct spans, fitting medium-run HVAC zones without custom hardware.
  • TCP/IP communication integrates directly into networked InnovairFlex detection systems.
  • Compact 14.38 × 5 × 2.5 in rectangular form installs in tight ductwork with minimal clearance.
Usually Ships in 2-3 Weeks Free shipping over $499
$73.39 $47.99 Save $25.40
Add to Cart
The item has been added Add to quote
$73.39 $47.99 Save $25.40
Save $25.40 Add to cart Add to quote
Save $6.64
System Sensor DST1 InnovairFlex Sampling Tube - Up to 1 Foot Duct
Add to Cart The item has been added

System Sensor DST1

System Sensor DST1 InnovairFlex Sampling Tube - Up to 1 Foot Duct

Duct sampling tube for InnovairFlex fire detection up to 1 foot

  • Samples duct airflow from 100–4,000 FPM, covering low-velocity returns to high-velocity supply runs.
  • Tool-free front or rear installation via patented quick-connect; no threaded fittings required.
  • Operates at 29VDC and integrates directly into 4-wire photoelectric fire alarm circuits.
Usually Ships in 2-3 Weeks Free shipping over $499
$18.63 $11.99 Save $6.64
Add to Cart
The item has been added Add to quote
$18.63 $11.99 Save $6.64
Save $6.64 Add to cart Add to quote
Save $10.64
System Sensor DST5 InnovairFlex Sampling Tube - 4 to 8 Foot Duct
Add to Cart The item has been added

System Sensor DST5

System Sensor DST5 InnovairFlex Sampling Tube - 4 to 8 Foot Duct

4-to-8-foot duct sampling tube for networked HVAC fire detection

  • Adjusts from 4 to 8 feet to cover variable duct widths without replacing hardware.
  • Tool-free snap-in mount to D4120 housing cuts installation time in tight duct access.
  • Supports air velocities from 100–4,000 FPM across –4°F to 158°F operating range.
Usually Ships in 2-3 Weeks Free shipping over $499
$35.63 $24.99 Save $10.64
Add to Cart
The item has been added Add to quote
$35.63 $24.99 Save $10.64
Save $10.64 Add to cart Add to quote
Save $12.58
System Sensor RA100Z Remote Annunciator for Duct Detectors (view 3)
Add to Cart The item has been added

System Sensor RA100Z

System Sensor RA100Z Remote Annunciator for Duct Detectors

TCP/IP remote annunciator for System Sensor duct detection systems

  • TCP/IP connectivity eliminates dedicated alarm wiring runs to remote monitoring stations.
  • Runs on 29VDC, drawing directly from existing panel auxiliary outputs—no converter needed.
  • Compact 14.38×5×2.5 in. body supports wall, ceiling, or rack mounting in tight spaces.
Usually Ships in 2-3 Weeks Free shipping over $499
$41.57 $28.99 Save $12.58
Add to Cart
The item has been added Add to quote
$41.57 $28.99 Save $12.58
Save $12.58 Add to cart Add to quote

Looking for more System Sensor products? Shop the full System Sensor catalog →

System Design, Deployment & Technical Support

Support services and planning resources for commercial surveillance, access control, and infrastructure deployments.

Fixed scope • Fixed price

System Design Assistance

  • Get help validating product compatibility
  • Coverage requirements
  • Storage planning and deployment architecture before you buy.
Request Design Help

Deployment & Configuration Support

  • Access fixed-scope support for rollout planning
  • User setup guidance
  • Migration and system standardization across single-site or multi-site deployments
View Support Services

Guides, Tools & Calculators

  • PoE requirements
  • Storage retention
  • Camera selection and deployment methodology
Open Technical Resources
!