System Sensor DST3 Tube

For professional fire safety in medium-width ventilation runs, the System Sensor DST3 is a critical metal duct sampling tube engineered for HVAC smoke detection. Designed specifically for ducts spanning 2 feet to 4 feet in width, this duct smoke detector accessory ensures accurate airflow sampling by extending across the air stream to capture combustion particles. The System Sensor DST3 sampling tube is fully compatible with both conventional and intelligent duct smoke detectors, including the InnovairFlex D4120 and DNRE series. Constructed from durable steel, the 36-inch tube features a cross-sectional design with precisely drilled holes that must face the airflow for optimal performance. As a veteran-grade HVAC duct sensor component, it slides into the detector housing from either the front or rear and locks securely via integrated tabs, streamlining the installation of sampling tubes in tight mechanical spaces. Rely on this UL-listed component to maintain system integrity and meet code requirements for early smoke detection in commercial air handling systems.

• Universal Compatibility: Seamlessly integrates with System Sensor conventional and addressable duct detectors, simplifying truck stock requirements.
• Rugged Metal Construction: The steel build withstands high-velocity airflow and industrial temperatures ranging from -4°F to 158°F.
• Tool-Free Installation: Features a plug-in sampling tube design that snaps into the InnovairFlex housing without requiring external fasteners.
• Precise Sampling Coverage: Engineered for 2–4 ft widths, ensuring the tube covers at least 2/3 of the duct to meet NFPA 90A standards.

What is the rule for selecting the correct sampling tube length?
The sampling tube must extend at least 5/8 to 2/3 across the HVAC duct width. For ducts between 24 and 48 inches wide, the DST3 is the required model. Using a tube that is too short will result in inadequate air sampling and potential code violations.

Does the DST3 require an end cap for operation?
Yes, the sampling tube end cap (typically included with the detector) must be installed on the far end of the System Sensor DST3 to create the necessary pressure differential for the photoelectric duct smoke detector to function.

Can this tube be cut to fit a shorter duct?
Yes, technicians can field-cut the metal tube to match specific duct dimensions, provided the end cap is securely reinstalled and the orientation of the sampling holes remains facing the air intake.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.