021-870

This high-performance differential air pressure switch is a vital safety component for HVAC systems and air handling units. Designed to function as an air proving switch, it monitors the pressure difference across blowers, filters, or coils to ensure proper airflow is maintained during operation. By detecting changes in air pressure within a range of -40 to 15, it prevents the system from running under unsafe or inefficient conditions, such as a blocked vent or a failing motor. This switch is a common replacement part for heating and cooling equipment that fails to trigger ignition or experiences frequent safety shutdowns due to airflow detection errors.
Type: Air Pressure Switch / Air Proving Switch
Size: Small / Standard HVAC Control Component
Application: Used in commercial and residential air handling units (AHU), furnaces, and ventilation systems to monitor airflow and prove pressure differentials.
Specifications: Operating Range: -40 to 15; Function: Differential pressure sensing for air proving and safety interlock.