System Sensor ST-3 Metal Sampling Tube for Duct Widths 2'-4'

Improve HVAC smoke detection performance with the System Sensor ST-3 metal sampling tube — engineered to deliver dependable air sampling for duct-mounted smoke detection in commercial and industrial environments. As a detector accessory, the ST-3 is optimized for ducts 2'-4' wide and features purpose-drilled inlet holes that must face the airflow to maximize sensitivity and reduce false alarms. Built from robust metal, the sampling tube stands up to routine HVAC conditions and integrates seamlessly with duct smoke detectors used in security, fire monitoring and surveillance applications.

For best results, install the tube so it extends at least two-thirds across the duct width; tubes longer than 3 ft should be supported opposite the detector to maintain alignment and performance. The ST-3’s straightforward design simplifies installation and maintenance, helping facility managers and integrators meet code and reliability expectations. Backed by a 3-year limited warranty and System Sensor build quality, this sampling tube is a practical upgrade for any duct smoke monitoring system. Order the ST-3 to enhance your building’s detection strategy or contact your representative for integration guidance.

• Ensures consistent duct smoke sampling for reliable HVAC fire monitoring across 2'-4' duct widths
• Durable metal construction resists wear and supports long-term use in commercial security and monitoring systems
• Designed with inlet holes oriented toward airflow for optimal detection sensitivity and reduced false alarms
• Extends recommended 2/3 across duct for improved smoke capture; supports over 3 ft can be added for stability
• Simple, compatible accessory for System Sensor detectors that streamlines installation and compliance in building protection plans