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

Model DFS–221 is 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. The DFS–221 is equipped with a convenient barbed sample line connector that accepts flexible tubing.