Air Pressure Sensing Switch Single Pole Double Throw Fixed Point Air Pressure Sensing Switch with Arrow Flow (.05" W.C.)

DFS Series provides an airflow proving switch designed for duct heater, oven, and other HVAC or Energy Management applications where an open‑mounted, nonadjustable switch is desirable. It is especially suitable for surface‑mounting in areas where internal access is limited. It can be used to sense positive, negative, or differential air pressure.