such as a dirty HVAC filter

Universal Compatibility: Designed for seamless integration with Fenwal Series 35 control modules and various DSI heating systems

The B1256558 is built for longevity in high-cycle applications

reducing installation time and preventing common alignment issues that lead to premature motor wear or restricted airflow

Fenwal 06-129500-003 Sampling Tube such as a dirty HVACThe 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