Reference · Detection
Duct Smoke Detector
A smoke detector sampling air inside HVAC ductwork to shut down air handlers and prevent smoke circulation. Requires a remote test/indicator where the housing is not visible.
NFPA 72: 17.7.5, NFPA 90A
Section numbers vary by edition — confirm in the edition your AHJ has adopted.
Read more in these guides
Smoke vs Heat Detectors: How to ChooseThe right detector in the right place detects real fires faster and avoids false alarms. Here's how smoke and heat detection compare.Preparing for a Fire Alarm InspectionInspections validate design and installation. Thorough documentation and a self-check prevent failed inspections and costly delays.