Lennox 20J97 1.15" WC SPST Pressure Switch

The Lennox 20J97 1.15 Inch WC SPST Pressure Switch is an essentialdevice used in HVAC systems in that it measures and controls air pressure. This pressure switch is intended for use with numerous heating and cooling equipment and it is vital for safe and efficient functioning. The SPST design makes it possible to open or interrupt a circuit depending on the air pressure that is normally around 1.15 Inches of water column. When the pressure rises to the required level, the switch turns on the system to begin or cease certain processes including the blower motor or to avoid overheating.