Fire & Life Safety

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    System Sensor 5601P 135F Fixed/Rate-of-Rise Mechanical Heat Detector
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    System Sensor 5601P

    System Sensor 5601P 135F Fixed/Rate-of-Rise Mechanical Heat Detector

    Dual-mode 135°F mechanical heat detector for two/four-wire fire loops

    • Dual fixed-temperature (135°F) and rate-of-rise detection reduces nuisance alarms.
    • Runs on 35VDC across two-wire or four-wire fire alarm circuits for flexible integration.
    • Electronics-free mechanical design eliminates firmware dependencies and processor latency.
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    System Sensor 5602 194F Fixed/Rate-of-Rise Mechanical Heat Detector
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    System Sensor 5602

    System Sensor 5602 194F Fixed/Rate-of-Rise Mechanical Heat Detector

    Two-wire mechanical heat detector for conventional fire alarm circuits

    • Dual fixed/rate-of-rise detection responds to both steady heat and rapid temperature spikes.
    • Two-wire conventional circuit at 35VDC connects directly to existing FACP without added modules.
    • Mechanical thermal element operates without electronic polling, reducing points of failure.
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    System Sensor 5604 194F Fixed Temperature Mechanical Heat Detector (view 3)
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    System Sensor 5604

    System Sensor 5604 194F Fixed Temperature Mechanical Heat Detector

    Fixed temperature heat detector for conventional 2-wire fire alarm systems

    • Operates on 35VDC conventional 2-wire loops—no addressable module or converter needed.
    • Box form factor supports ceiling or wall mounting in warehouses and mechanical rooms.
    • Mechanical thermal element requires zero calibration or configuration post-installation.
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  • Save $17.71
    System Sensor 5621 135F Dual-Circuit Fixed/Rate-of-Rise Heat Detector
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    System Sensor 5621

    System Sensor 5621 135F Dual-Circuit Fixed/Rate-of-Rise Heat Detector

    135°F dual-circuit heat detector for conventional and addressable systems

    • Dual-circuit design supports both conventional and addressable panels without relay adapters.
    • 135°F fixed-temp plus rate-of-rise detection reduces nuisance alarms in mixed-use spaces.
    • Operates at 35VDC, compatible with standard conventional fire alarm control panels.
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    System Sensor 5622 194F Dual-Circuit Fixed/Rate-of-Rise Heat Detector
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    System Sensor 5622

    System Sensor 5622 194F Dual-Circuit Fixed/Rate-of-Rise Heat Detector

    Dual-circuit heat detector with fixed and rate-of-rise sensing for fire alarm systems

    • Dual fixed-temp and rate-of-rise sensing catches both slow smoldering and fast fires.
    • Operates at 35VDC for direct integration with conventional fire alarm control panels.
    • Ceiling-mount installation follows NFPA 72 spacing standards for commercial deployments.
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  • Save $19.24
    System Sensor 5623 135F Dual-Circuit Fixed Temperature Heat Detector
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    System Sensor 5623

    System Sensor 5623 135F Dual-Circuit Fixed Temperature Heat Detector

    135°F fixed-temperature heat detector with dual-circuit conventional and addressable wiring

    • Fixed 135°F thermal setpoint eliminates false alarms in dusty or vapor-heavy spaces.
    • Dual-circuit design supports both two-wire conventional and addressable loops on one SKU.
    • Rated for 35VDC operation; confirm panel voltage and loop config before deployment.
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  • Save $19.24
    System Sensor 5624 194F Dual-Circuit Fixed Temperature Heat Detector
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    System Sensor 5624

    System Sensor 5624 194F Dual-Circuit Fixed Temperature Heat Detector

    Dual-circuit fixed temperature heat detector with TCP/IP networking

    • Fixed 194°F activation threshold eliminates sensitivity tuning in high-heat zones.
    • Operates at 35VDC from the FACP—no external power supply or special config needed.
    • Dual-circuit design supports conventional loop wiring for alarm and supervisory states.
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  • Save $0.93
    System Sensor A77-AB2 Retrofit Adapter Bracket for i3 Series (view 3)
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    System Sensor A77-AB2

    System Sensor A77-AB2 Retrofit Adapter Bracket for i3 Series

    TCP/IP retrofit adapter bracket for System Sensor i3 Series fire panels

    • Designed for i3 Series panels, ensuring mechanical and electrical compatibility out of the box.
    • Rated for 35VDC operation, matching standard fire alarm power architectures without extra regulation.
    • Mounts to a 3½-inch octagonal back box; fits wall, ceiling, or rack deployments.
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  • Save $28.65
    System Sensor APA151 Remote Annunciator with Piezo Alert
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    System Sensor APA151

    System Sensor APA151 Remote Annunciator with Piezo Alert

    Remote annunciator with piezo sounder for 24 VDC fire alarm systems

    • Operates on 24 VDC supervised power for continuous panel-monitored circuit health.
    • Integrated piezo sounder adds local audible output without additional signal runs to panel.
    • Compact 14.38 × 5 × 2.5 in body suits wall or enclosure mounting in secondary locations.
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  • Save $0.24
    System Sensor B114LP detector base terminal connections and wiring detail
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    System Sensor B114LP

    System Sensor B114LP 120VAC Low-Profile Plug-In Detector Base

    Low-profile 120VAC plug-in base with TCP/IP networking for confined spaces

    • Runs on 120VAC building power, eliminating separate low-voltage supply infrastructure.
    • TCP/IP connectivity enables direct network integration without proprietary polling loops.
    • Low-profile form mounts on 4-inch square/octagon box (1.5-inch min depth) for tight spaces.
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    System Sensor B114LPBT detector base connector terminals and mounting hardware detail
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    System Sensor B114LPBT

    System Sensor B114LPBT 24VAC/DC Low-Profile Plug-In Detector Base

    Low-profile 24VAC/DC plug-in base with TCP/IP networking

    • Accepts 400 Series detectors (1400, 1412B, 1424) with no field wiring modifications.
    • Dual-voltage 24VAC/DC operation integrates with standard fire alarm power supplies.
    • Twist-on bracket with SEMS screw terminations enables tool-minimal ceiling/wall install.
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    System Sensor B116LP 2-wire low-profile plug-in detector base for fire alarm systems
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    System Sensor B116LP

    System Sensor B116LP 2-Wire Low-Profile Plug-In Detector Base with ...

    2-wire low-profile detector base, 24VDC, plug-in System Sensor modules

    • Plug-in head design lets you swap detector modules without rewiring the base.
    • Rated 24VDC for direct integration with conventional 2-wire fire alarm control panels.
    • Tool-free removable cover and insect screen simplify field cleaning to cut nuisance alarms.
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  • Save $78.79
    System Sensor BEAMLRK Active Infrared Beam Detector Long-Range
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    System Sensor BEAMLRK

    System Sensor BEAMLRK Active Infrared Beam Detector Long-Range

    Long-range active IR beam detector with relay output for perimeter protection

    • Covers detection spans from 16 ft to 328 ft, suiting warehouses and high-ceiling spaces.
    • Relay output integrates directly into any 24–32 VDC UL-listed fire alarm or security panel.
    • Rated for –22°F to 131°F operation, supporting outdoor perimeter and harsh-environment installs.
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    System Sensor BEAMMMK Beam Detector Multi-Mount Kit
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    System Sensor BEAMMMK

    System Sensor BEAMMMK Beam Detector Multi-Mount Kit

    Multi-position mounting kit for System Sensor TCP/IP beam detectors

    • Supports wall, ceiling, and structural column mounting for BEAM1224 series detectors.
    • Operates across -30 to 55°C, suitable for warehouses, garages, and loading docks.
    • Enables precise transmitter/reflector alignment without special tools during installation.
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    System Sensor BEAMSMK Beam Detector Surface-Mount Kit (view 3)
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    System Sensor BEAMSMK

    System Sensor BEAMSMK Beam Detector Surface-Mount Kit

    Surface-mount kit for System Sensor beam detectors on 32VDC networks

    • Secures BEAM1224 series detectors on walls or ceilings without special tools.
    • Supports 15–32 VDC operation across commercial, warehouse, and industrial sites.
    • Enables beam detector alignment across optical paths from 16 ft. to 328 ft.
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    System Sensor CO-PLATE CO Detector Replacement Plate
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    System Sensor CO-PLATE

    System Sensor CO-PLATE CO Detector Replacement Plate

    TCP/IP CO detector replacement plate for networked fire safety systems

    • Replaces CO1224T, CO1224TR, and CO1224A faceplates without full device re-certification.
    • Mounts to a standard single-gang back box and runs on the existing 24VDC supply.
    • Maintains UL 2075 (US) and CSA 6.19-01 (Canada) compliance after plate swap.
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    System Sensor CO1224TR 4-Wire CO Detector with Form C Relay
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    System Sensor CO1224TR

    System Sensor CO1224TR 4-Wire CO Detector with Form C Relay

    4-wire CO detector with Form C relay for fire alarm integration

    • 24VDC 4-wire design integrates directly into conventional or addressable fire alarm panels.
    • Form C relay output enables dry-contact alarm signaling without intermediate interface modules.
    • 10-year end-of-life timer and RealTest capability reduce commissioning and maintenance overhead.
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    System Sensor COSMO-2W i4 Series 2-Wire CO/Smoke Detector with Sounder (view 3)
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    System Sensor COSMO-2W

    System Sensor COSMO-2W i4 Series 2-Wire CO/Smoke Detector with Sounder

    Dual smoke/CO detector on single 2-wire loop with integrated sounder

    • Photoelectric smoke and electrochemical CO sensing share one 2-wire loop address.
    • Integrated sounder eliminates external horn modules, reducing device count per zone.
    • Mounts to 3.5"/4" octagonal, single-gang, 4" square, or round ceiling boxes.
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    System Sensor COSMO-4W 4-Wire Combination CO/Smoke Detector with Sounder (view 3)
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    System Sensor COSMO-4W

    System Sensor COSMO-4W 4-Wire Combination CO/Smoke Detector with Sounder

    4-wire combo CO/smoke detector with built-in sounder for conventional panels

    • Combines CO and ionization smoke detection in one unit, reducing loop device count.
    • Built-in sounder eliminates separate notification appliance wiring at each install point.
    • 35VDC 4-wire design integrates directly with conventional fire alarm control panels.
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    System Sensor COSMOD2W i4 Series 2-Wire Interface Module
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    System Sensor COSMOD2W

    System Sensor COSMOD2W i4 Series 2-Wire Interface Module

    2-wire interface module for fire alarm system integration at 35VDC

    • Operates at 35VDC for direct integration with conventional fire alarm control panels.
    • 2-wire protocol support simplifies retrofit wiring into existing detection architectures.
    • Compact form factor mounts in standard electrical enclosures without dedicated power drops.
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    System Sensor COSMOD4W i4 Series 4-Wire Interface Module
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    System Sensor COSMOD4W

    System Sensor COSMOD4W i4 Series 4-Wire Interface Module

    i4 Series 4-wire interface module for addressable fire detection networks

    • Bridges 4-wire detection circuits into i4 Series addressable networks without rewiring.
    • Operates at 35VDC, enabling direct integration with i4 Series loop power supplies.
    • Supports i3 Series detectors and multi-panel distributed fire safety deployments.
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    System Sensor D2 2-Wire Photoelectric Duct Smoke Detector (view 2)
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    System Sensor D2

    System Sensor D2 2-Wire Photoelectric Duct Smoke Detector

    Photoelectric duct detector, 2-wire conventional, 29VDC for HVAC systems

    • Photoelectric sensing reliably detects smoldering fires in HVAC ductwork.
    • 2-wire circuit cuts conduit runs—power and signaling share one wire pair.
    • 29VDC operation integrates with legacy and modern panels without added modules.
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    System Sensor D4120 4-Wire Photoelectric Duct Smoke Detector (view 3)
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    System Sensor D4120

    System Sensor D4120 4-Wire Photoelectric Duct Smoke Detector

    4-wire photoelectric duct detector, 24 VDC, direct mount to HVAC

    • Photoelectric sensing targets smoldering-fire smoke particles before spread through HVAC zones.
    • 4-wire, 24 VDC design integrates with conventional and addressable fire alarm control panels.
    • IP66-rated housing mounts directly into standard ductwork at 14.38 × 5 × 2.5 in footprint.
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    System Sensor D4120W 4-Wire Watertight Duct Smoke Detector
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    System Sensor D4120W

    System Sensor D4120W 4-Wire Watertight Duct Smoke Detector

    4-wire duct detector with NEMA 4 watertight housing for humid HVAC environments

    • NEMA 4 watertight enclosure blocks moisture and dust, preventing false alarms in high-humidity ductwork.
    • Separate 4-wire alarm and supervisory circuits let HVAC shutdown logic run independently from audible alarms.
    • 29VDC hardwired operation integrates directly into conventional fire alarm panels—no protocol converters needed.
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    System Sensor D4240 4-Wire Duct Smoke Detector 120VAC
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    System Sensor D4240

    System Sensor D4240 4-Wire Duct Smoke Detector 120VAC

    4-wire duct smoke detector for supply/return air HVAC monitoring

    • 4-wire supervised wiring supports alarm, trouble, and reset on conventional or addressable panels.
    • Runs on 120VAC, eliminating the need for a separate low-voltage power supply in HVAC installations.
    • Compact 14.38" x 5" x 2.5" housing fits standard supply or return air duct cutouts without modification.
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    System Sensor D4P120 Duct Detector Power Board Component (view 2)
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    System Sensor D4P120

    System Sensor D4P120 Duct Detector Power Board Component

    TCP/IP duct detector power board, 29VDC output for System Sensor assemblies

    • Supplies regulated 29VDC to photoelectric sensor heads in D4120 duct detector assemblies.
    • Operates across –4°F to 158°F, supporting installations in harsh mechanical environments.
    • ¾-inch conduit knockout and terminal-block wiring simplify 4-wire field connections.
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    System Sensor D4S 4-Wire Duct Smoke Detector (view 2)
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    System Sensor D4S

    System Sensor D4S 4-Wire Duct Smoke Detector

    4-Wire duct smoke detector with TCP/IP network connectivity for HVAC monitoring

    • Operates at 29VDC, matching standard fire alarm panel power supplies with no external converter.
    • TCP/IP connectivity enables real-time network alerts alongside hardwired 4-wire panel signaling.
    • Rated for –20 to 70°C operation, supporting reliable HVAC duct deployment across harsh environments.
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    System Sensor DECAL-W White Letter Decal Kit for Red Devices
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    System Sensor DECAL-W

    System Sensor DECAL-W White Letter Decal Kit for Red Devices

    White letter decals for System Sensor red security devices

    • Labels System Sensor red SpectrAlert Advance devices without tools or modifications.
    • Adhesive backing works on both indoor and outdoor device surfaces after simple prep.
    • Compatible exclusively with System Sensor red device line — verify model before ordering.
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    System Sensor DECAL-WC White Letter Decal Kit for Red Ceiling Devices
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    System Sensor DECAL-WC

    System Sensor DECAL-WC White Letter Decal Kit for Red Ceiling Devices

    White letter decal kit for System Sensor red ceiling devices

    • Labels red SpectrAlert Advance ceiling strobes and horn-strobes without affecting strobe output.
    • Rated for indoor and outdoor use across a wide temperature range of −35°F to 151°F.
    • Tool-free application to device lens or trim ring; full adhesion achieved within 24 hours.
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    System Sensor DH400OE-1 Weatherproof Outdoor Duct Detector Enclosure (view 2)
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    System Sensor DH400OE-1

    System Sensor DH400OE-1 Weatherproof Outdoor Duct Detector Enclosure

    Sealed outdoor duct detector enclosure for rooftop HVAC smoke detection

    • Weatherproof sealed housing blocks rain, snow, dust, and UV for outdoor HVAC installs.
    • Compact 14.38 × 5 × 2.5 in footprint fits wall, ceiling, or rack mounting on rooftop ducts.
    • Operates at 29 VDC with no gateway hardware needed for standard fire alarm integration.
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    System Sensor DST1 InnovairFlex Sampling Tube - Up to 1 Foot Duct
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    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.
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    System Sensor DST10 InnovairFlex Sampling Tube - 8 to 12 Foot Duct
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    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.
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    System Sensor DST3 InnovairFlex Sampling Tube - 2 to 4 Foot Duct
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    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.
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    System Sensor DST5 InnovairFlex Sampling Tube - 4 to 8 Foot Duct
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    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.
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    System Sensor EOLR-1 EOL supervision device front panel and indicator lights
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    System Sensor EOLR-1

    System Sensor EOLR-1 End-of-Line Power Supervision Relay

    End-of-line relay detects open/short circuits in fire alarm branches

    • Detects open and short circuits at branch termination, reporting faults to the panel instantly.
    • Monitors power continuity on supervised branches to flag voltage loss before detectors are affected.
    • Compatible with conventional and hybrid addressable/conventional architectures for flexible deployment.
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    System Sensor ETX InnovairFlex Exhaust Tube 12-Inch
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    System Sensor ETX

    System Sensor ETX InnovairFlex Exhaust Tube 12-Inch

    12-inch flexible exhaust tube for System Sensor ETX air sampling

    • Flexible 12-inch tube routes exhaust air where rigid piping is impractical.
    • Rated for –4°F to 158°F and 0–95% RH, supporting harsh HVAC environments.
    • Mounts to ¾-inch conduit knockout on InnovairFlex D4120 housings, no tools needed.
    Usually Ships in 2-3 Weeks Free shipping over $499
    $14.48 $9.99 Save $4.49
    The item has been added Add to quote
    $14.48 $9.99 Save $4.49
    Save $4.49 Add to cart Add to quote
Fire & Life Safety

Commercial fire alarm and life-safety equipment for office, retail, multifamily, education, healthcare, and industrial deployments. Code-compliant initiating devices, notification appliances, and control panels — sourced direct from the manufacturer or a US channel distributor with full UL listings and AHJ documentation.

Specify a Code-Compliant System

  • Control panels — conventional zone panels for small buildings; addressable systems for multi-loop deployments, healthcare, education, and multi-tenant retrofits.
  • Initiating devices — photoelectric, ionization, dual-sensor smoke; fixed and rate-of-rise heat; CO; manual pull stations; duct detectors.
  • Notification appliances — horn-strobes, speaker-strobes, mini-horns, chimes with synchronized signaling and ADA candela ratings.
  • Monitor and control modules — for waterflow, tamper, door-hold, elevator recall, and integration with access-control egress.
  • Sprinkler monitoring — waterflow and tamper switches connecting wet/dry/pre-action systems to the FACP per NFPA 72.

Shop by Category

Fire Alarm Panels
Conventional and addressable control panels — single-loop to multi-loop systems with voice evacuation and network annunciation.
Smoke Detectors
Photoelectric, ionization, and dual-sensor detectors — addressable and conventional, with sensitivity drift compensation on listed models.
Heat Detectors
Fixed-temperature and rate-of-rise heat detectors for environments where smoke detection isn't appropriate — kitchens, garages, attics.
CO Detectors
Listed CO sensors for residential and commercial occupancies — addressable models integrate directly into the FACP for monitored response.
Duct Detectors
HVAC duct-mount smoke detectors with sampling tubes — required by NFPA 90A for air-handling units above the airflow threshold.
Pull Stations
Single- and dual-action manual pull stations — addressable and conventional, with key reset and tamper-resistant covers available.
Notification Appliances
Horn-strobes, speaker-strobes, mini-horns, and chimes — synchronized signaling per NFPA 72 with ADA-compliant candela ratings.
Fire Alarm Modules
Monitor, control, relay, and isolator modules for addressable loops — connect waterflow, tamper, door-hold, and elevator recall.
Detector Bases & Accessories
Standard bases, sounder bases, relay bases, and isolator bases — plus tools, covers, and replacement parts to maintain installed systems.
Sprinkler Monitoring
Waterflow switches, tamper switches, and pressure supervisory devices — UL-listed for connection to FACP monitor modules.

Featured Brands

System Sensor
Industry-standard smoke, heat, CO, and duct detectors — addressable and conventional. The SpectrAlert series sets the bar for notification appliances.
Potter
Fire alarm control panels, sprinkler waterflow/tamper switches, and notification — US-manufactured commercial fire systems.
STI
Protective covers and guards for pull stations, detectors, and notification — vandal-resistant for school, transit, and public-area deployments.
Honeywell
Fire-Lite and Notifier panels and devices — full ecosystem from conventional to networked addressable systems.
DMP
Commercial intrusion and fire combination panels with cellular and IP communicators — US-manufactured and supported.
DSC
Hybrid burglar/fire control panels for small commercial — wireless-friendly with PowerSeries Neo expandability.

Specifier FAQ

What NFPA codes apply to my building?
NFPA 72 governs alarm system installation, testing, and inspection. NFPA 101 (Life Safety Code) drives notification, egress, and detector placement based on occupancy classification (assembly, business, educational, healthcare, mercantile, residential, industrial). Your local AHJ may also enforce state amendments. When in doubt, consult the AHJ before specifying panels or notification.
Conventional vs addressable — which do I need?
Conventional zone systems work well for small buildings (under 20,000 sq ft) where zone-level granularity is sufficient and budget is the driver. Addressable systems identify each device individually — required by most modern building codes for buildings over a certain size or occupancy type, and standard for multi-tenant retrofits, healthcare, and education. Addressable also simplifies testing, maintenance, and false-alarm troubleshooting.
Where do I need CO detection?
Code requirements vary by state and occupancy. Generally: residential dwelling units with fuel-burning appliances or attached garages, transient occupancies (hotels), and some commercial buildings with combustion sources. CO detectors near sleeping areas are the most common requirement — check your local amendments to NFPA 720 and IRC.
How is fire alarm integrated with access control?
On alarm, the fire system sends a signal to the access-control panel to release locked egress doors (door-hold-open or unlock) along required egress paths. Implementation uses a monitored relay output from the FACP wired to the access controller's auxiliary input, plus an addressable monitor module on the loop. Lifesafety Power FlexPower and similar supervised supplies coordinate the handoff.
What's the typical lead time on fire panels?
Stock items — pull stations, common notification appliances, basic conventional panels — typically ship same business day or 2-3 weeks depending on configuration. Configured addressable panels, large-loop systems, and special-order items typically run 2-6 weeks from the manufacturer. Submit your project bill of materials via the contact form for a precise lead time.

Working on a fire-system project?

Our Senior Specialist team has working integrators who specify and commission commercial fire-alarm systems daily. Send your project documents — panel selection, device count, code authority — and we'll route the bill of materials and lead times back to you.

Talk to a Senior SpecialistAbout IP Security Depot

Quick links to guides

Fire Alarm System Buyer's Guide
Addressable vs conventional panels, NFPA 72 scope, voice evacuation, device coverage, brand comparison (Potter, Honeywell, Bosc...
NFPA 72 Code Compliance Reference
NFPA 72 quick reference: detector spacing, notification audibility and candela tables, battery calcs, inspection cadence, AHJ s...
Notification Appliance Selection Guide
Horns, strobes, speakers, and combos for fire alarm and ECS. UL 1971 / 1480 / 2572, candela math, audibility tables, ADA placem...
Mass Notification System Design Guide
MNS design: ECS Class A/B/C, distributed vs centralized, fire alarm integration, voice intelligibility (STI), outdoor sirens, U...
Emergency Lighting and Exit Sign Code Guide
NFPA 101 Life Safety Code basics for emergency lighting and exit signs. 90-min battery runtime, photoluminescent vs electric si...