Fenwal 06-129500-003 Sampling Tube

The Fenwal 06-129500-003 is a 48-inch air duct smoke detector sampling tube engineered for precise smoke detection in commercial HVAC systems. Designed for duct widths between 3 and 4 feet, this rigid inlet sampling tube directs airflow from the supply or return duct into the sensing chamber of Fenwal DH-60 and DH-2000 series detectors. Its UL 268A listed construction ensures reliable performance across a broad air velocity range of 500 to 4,000 feet per minute (FPM). The 48" length provides optimal cross-sectional coverage for medium-span ductwork, facilitating the early capture of combustion particles to trigger life-safety protocols such as fan shutdown and damper control. For contractors performing fire-life safety retrofits or maintenance, this tube installs directly into the detector housing without a separate exhaust tube, as those are typically integrated into the header. Ensure the sampling holes are oriented correctly into the airflow to maintain NFPA 72 compliance and system sensitivity.

• Precise Air Sampling: Calibrated for duct smoke detection in systems with high-velocity airflow.
• Direct Compatibility: Designed specifically for the Fenwal DH-60 (2W/4W) and SmartOne DH-2000 housings.
• Easy Integration: Features a notched design for verified orientation within the duct detector header.
• Durable Construction: Built to withstand the constant static pressure in air handling units (AHUs).

What duct size is the Fenwal 06-129500-003 for?
This 48-inch tube is intended for HVAC ducts measuring between 36 and 48 inches (3 to 4 feet) in width. For ducts wider than 4 feet, a 72-inch or 96-inch sampling tube should be used and trimmed if necessary.

How do I install the sampling tube correctly?
Insert the tube into the duct detector housing so the inlet holes face directly into the upstream airflow. Secure with the provided mounting screws and ensure the end cap is firmly in place to prevent pressure loss.

Does this tube require a separate exhaust tube?
No, the Fenwal DH series housings feature an integral exhaust tube molded into the base. Only the 06-129500-003 inlet tube is required for standard air sampling applications.

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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.