Description
The Cleveland Controls DFS-221-156 Air Flow Switch detects airflow movement and activates or deactivates connected electrical circuits based on air pressure conditions within the system. Its differential pressure sensing mechanism responds to changes in airflow across ducts or blower sections, allowing verification of proper ventilation and fan operation within HVAC systems such as combustion air equipment, exhaust ventilation units, and variable air volume ducts. This airflow switch is mounted near ductwork or blower compartments and connected to pressure tubing and control circuits where airflow confirmation is required. Its responsive switching action improves operational safety and assists with airflow verification.
