Duct Detectors

Duct Detectors

Duct-mounted smoke detectors for HVAC air handling system monitoring. Sampling tube assemblies draw air from duct cross-sections to detect smoke migration through ventilation systems, triggering fan shutdown and fire alarm notification per NFPA 90A requirements.

Plan Your Deployment

  • Size sampling tube length to match duct cross-section dimensions
  • Confirm detector sensitivity settings for duct airflow velocity range
  • Plan remote test and reset station location for accessible maintenance
  • Specify relay output wiring for AHU fan shutdown on alarm condition
  • Verify installation meets NFPA 90A and local mechanical code for duct detection

Duct Detectors — Engineering-Grade Fire Detection for Commercial Deployments

This category covers 0 working models of duct detectors sourced manufacturer-direct or through channel-direct US distribution. Build the rest of your system around the architectural choices below — compatibility, environmental rating, and lifecycle decisions made here propagate through every downstream component you specify.

What to Look For

Addressable versus conventional architecture is the first decision. Conventional systems group detectors into zones; addressable systems identify the exact device that triggered. For buildings above 10,000 sq ft or with more than 20 detectors, addressable saves substantial diagnostic time and meets most modern code requirements. Conventional panels remain economical for small commercial buildings and retrofits where new wiring isn't feasible.

UL 864 listing is non-negotiable for the panel; UL 268 for smoke detectors, UL 521 for heat detectors. The AHJ will reject anything else. Beyond UL, look for FM Approval and CSFM (California) listings — many jurisdictions accept only those. Confirm panel-to-detector compatibility within the manufacturer's listed combinations; mixing brands across UL listings voids the panel's certification.

Notification appliance circuit (NAC) capacity, voltage drop, and battery backup sizing drive panel sizing more than detector count does. ADA-compliant strobes draw 75-175 mA each — a 50-strobe building exceeds many small NAC ratings. Calculate total NAC load with voltage-drop budget for the longest run, and size standby battery for 24 hours plus 5 minutes alarm per NFPA 72.

Central station communication, networked panel federation, and graphical workstations matter most in multi-building campuses. Single-building panels typically dial a central station via cellular and IP; multi-building campuses run proprietary peer-to-peer networks (Notifier NFN, Siemens FN-2127, Edwards SIGA) with master annunciation. Plan the integration topology before ordering panels — head-end choice affects which compatible peripherals you can deploy.

Related Categories

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Frequently Asked Questions

Do I need an addressable or conventional fire alarm panel?

Addressable panels identify the specific detector in alarm; conventional panels identify only the zone. NFPA 72 and most local codes require addressable for buildings above certain occupancy or square-footage thresholds, but the practical break-even is around 20-30 detectors. Above that count, addressable saves diagnostic and maintenance time. Below it, conventional is often the budget-friendly choice.

What's the difference between photoelectric and ionization smoke detectors?

Photoelectric detectors respond fastest to smoldering fires (cigarettes, electrical wiring); ionization detectors respond fastest to flaming fires (paper, kitchen). Modern dual-sensor detectors include both technologies and meet UL 268 7th edition requirements. Most jurisdictions now require dual-sensor or photoelectric for new commercial installations. Ionization-only is being phased out due to nuisance-alarm performance in cooking and shower-steam scenarios.

How often must fire alarm systems be inspected?

NFPA 72 requires annual inspection and testing of the entire system, semiannual battery testing, and monthly visual inspection of the panel. Local AHJ requirements often mandate documentation and a service contract with a licensed contractor. The owner-of-record bears legal responsibility for inspections — missing an annual inspection exposes the owner to fines and insurance claim denial.

Do I need a duct smoke detector?

Yes if the HVAC system exceeds 2,000 CFM (commercial threshold) — code requires duct smoke detectors that shut down the HVAC to prevent smoke distribution during a fire. Confirm CFM rating against local code thresholds; many jurisdictions require duct detection on smaller systems serving multiple-occupancy buildings. Duct detectors must report to the building's fire alarm panel.

What battery backup is required for fire panels?

NFPA 72 requires 24 hours of standby operation plus 5 minutes in full alarm. Calculate panel current draw under both conditions, then specify a battery with adequate Ah capacity. Lead-acid batteries lose capacity in cold environments — derate by 20% for unconditioned spaces. Replace batteries every 4-5 years even if they test good; failure rates climb steeply after year 5.

Need help choosing? Talk to a Senior Specialist — direct line 877-277-7147 or request a quote.

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