Lennox 18M63 Dual Stage Pressure Switch 0.20"/0.45" WC

The Lennox 18M63 is a two-stage pressure switch designed for use in residential and light commercial HVAC systems. This OEM replacement component monitors pressure differentials to ensure safe and efficient furnace operation by verifying proper air flow and venting.

Key Features:

• Dual-stage operation with setpoints at 0.20" and 0.45" water column
• Ensures proper inducer motor function and safe combustion air flow
• Direct OEM replacement for Lennox furnaces and heating equipment
• Reliable switching mechanism for multi-stage furnace applications
• Factory-calibrated pressure settings for accurate operation

This pressure switch is a critical safety component that prevents furnace operation when adequate draft pressure is not detected. The two-stage design allows it to work with multi-stage furnaces, activating different heating stages based on pressure requirements. Genuine Lennox OEM part ensures proper fit and reliable performance.