The System Sensor ST-10 is a heavy-duty metal sampling tube engineered specifically for HVAC duct smoke detection in large-scale commercial air handling systems. Designed for duct widths from 8 ft to 12 ft, this 10-foot rigid component is essential for facilitating cross-sectional airflow sampling. It is fully compatible with System Sensor legacy duct smoke detector models, including the DH100, DH200, DH400, and DH500 series. By drawing air through factory-drilled air inlet holes and directing it into the detector's sensing chamber, the ST-10 ensures reliable smoke detection across wide plenums where standard tubes fall short. For professional installation, the ST-10 sampling tube must be positioned with the inlet holes facing directly into the airflow. Per NFPA 72 and manufacturer specifications, any sampling tube exceeding 3 feet in length requires mechanical support at the end opposite the detector to prevent vibration or sagging within the ductwork. This duct smoke detector accessory is a critical legacy part for maintaining existing fire life safety systems that utilize those older, high-performance System Sensor Innovair housings in wide-duct applications. Key Benefits Broad Compatibility: Drop-in fit for legacy DH100, DH200, DH400, and DH500 duct smoke detectors. Wide Duct Reach: Optimized for 8-foot to 12-foot duct widths to ensure comprehensive smoke sampling. Rugged Construction: Durable metal sampling tube design provides long-term stability in high-velocity air streams. Code Compliance: Supports adherence to NFPA 90A requirements for smoke detection in large commercial HVAC systems. Common Questions What is the maximum duct width for the ST-10? The ST-10 is rated for duct widths between 8 ft and 12 ft. For ducts wider than 12 feet, please consult technical documentation for specific alternative arrangements or additional supports. Does this tube require an end plug? Yes, an end plug must be used on the far end of the sampling tube to ensure the duct smoke detector creates the necessary differential pressure to pull air through the sampling ports. Can the ST-10 be cut to fit a slightly smaller duct? Yes, contractors can field-cut the tube to match the specific duct width, provided the tube still extends at least 2/3 to 80% across the width as per local fire codes. This item is not eligible for free shipping. 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.
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