Johnstone Supply

Technical FAQ and Troubleshooting:

Integrating this OEM Carrier filter drier into your HVAC system recovery workflow maintains refrigerant purity and prevents copper plating and mechanical seize-up over the system lifecycle

This 20-inch fan guard is designed to meet factory airflow specifications while providing a rigid barrier for the fan assembly

Universal Compatibility: Replaces over 200 part numbers from major brands including Lennox

Lennox 10U93 Pressure Switch 321142-301 Johnstone SupplyThe Lennox 10U93 Pressure Switch is a critical OEM safety component designed for precise airflow monitoring in Lennox, Armstrong, and Ducane furnace systems. This . 65" WC SPST pressure switch functions by validating that the inducer motor is creating sufficient draft to safely vent combustion gases before allowing the ignition sequence to proceed. As a Single Pole Single Throw (SPST) normally open switch, it provides a reliable electrical signal to