Edwards Signaling SD-T78 SuperDuct 70" Air Sample Tube for Duct Smoke Detectors

Ideal for reliable HVAC duct smoke monitoring, the Edwards Signaling SD-T78 SuperDuct 70in air sample tube brings accurate, low-profile smoke detection to commercial and industrial ventilation systems. As a detector accessory from Edwards Signaling, this SuperDuct tube integrates a PCB-mounted photoelectric sensor with patented differential environmental compensation so sensitivity remains stable and drift-free—minimizing nuisance alarms and maintenance calls. The tube’s slim profile (under 2 in depth) makes retrofits in tight ductwork fast and cost-effective, while support for high air velocities up to 4000 ft/min ensures consistent performance in demanding HVAC applications. With a wide smoke sensitivity range (0.79%–2.46% per ft) and a prewired, plug-in detector base compatible with Kidde intelligent and SD-4WJ detectors, the SD-T78 reduces installation time and simplifies testing and service. Specified by security professionals for duct smoke monitoring, this detector accessory enhances building fire detection, surveillance, and safety monitoring programs. Contact your sales representative or order now to upgrade duct smoke detection on your next security or HVAC project.

• Compact, sub-2 in depth that simplifies installation and retrofit in tight HVAC ducts, reducing labor and downtime
• Onboard PCB-mounted photoelectric sensing with patented differential compensation for stable, drift-free smoke detection
• Designed for high-velocity ducts (up to 4000 ft/min) to deliver reliable monitoring in demanding airflow environments
• Wide sensitivity range (0.79%–2.46% per ft) for accurate smoke sampling and fewer false alarms in varied conditions
• Plug-in, prewired detector base and compatibility with standard Kidde/SD-4WJ detectors for fast, low-risk commissioning