Lennox 15M20 Pressure Switch -0.10" WC SPST

The Lennox 15M20 is a single-pole single-throw (SPST) pressure switch designed for use in Lennox heating and cooling systems. This switch monitors air pressure differentials and is calibrated to activate at -0.10 inches water column (WC), making it ideal for verifying proper draft and airflow in furnace applications.

Key Features:

• Pressure setpoint: -0.10" WC (negative pressure activation)
• SPST configuration for simple on/off control
• Factory calibrated for accurate and reliable operation
• Direct replacement for Lennox OEM equipment
• Critical safety component for proper furnace operation

This pressure switch is a genuine Lennox replacement part commonly used to ensure safe combustion air pressure levels. When airflow drops below the specified threshold, the switch opens to prevent unsafe furnace operation. Professional installation is recommended to ensure proper setup and system safety.