Lennox 20J97 Pressure Switch 320735-701 Install the barometric damper in

Install the barometric damper in a bypass duct between the supply plenum (before any zone dampers) and the return air duct

this unit is designed for indoor industrial and commercial spaces such as warehouses

if the coil is magnetized but the valve won't shift

significantly reducing the risk of mechanical failure in high-pressure environments

Lennox 20J97 Pressure Switch 320735-701 Install the barometric damper inThe Lennox 20J97 Pressure Switch is a mission critical safety component engineered for high efficiency HVAC units requiring precise draft proving. This OEM Lennox replacement part features a 1. 15" WC set point and a Single Pole Single Throw (SPST) configuration, ensuring the combustion air inducer is generating the necessary static pressure before allowing the ignition sequence to proceed. Designed with a standard 1 4" barb connection, it integrates