significantly exceeding the performance of standard 5-micron shop filters

While the housing is permanent

providing stable low-voltage power for contactors

Key Benefits Ensures proper ventilation and safe exhaust gas expulsion for code-compliant operation

10" WC (Water Column) trip point

Lennox 12L20 Pressure Switch 323055-751 significantly exceeding the performance ofThe Lennox 12L20 Pressure Switch is a critical OEM HVAC safety control designed to protect the compressor and refrigeration circuit from catastrophic failure. As a 590 PSI high pressure switch, it operates on a Normally Closed (N C) logic, meaning the internal contacts are closed during standard operation and snap open to kill the control circuit when discharge pressure exceeds the factory setpoint. This Lennox replacement part ensures the system