Description
Lennox 26W45 Two-Stage Pressure Switch
The Lennox 26W45 is an OEM replacement two-stage pressure switch engineered for use in compatible Lennox furnace systems. Designed to monitor negative pressure generated by the inducer motor, this switch confirms proper venting and combustion airflow before allowing the gas valve to open — a critical safety function in modern induced-draft and condensing furnaces.
Key Features
- Two-stage pressure switch with dual set points: 0.90″ W.C. and 1.50″ W.C.
- OEM Lennox replacement part — direct fit for compatible Lennox furnace models
- Monitors inducer motor operation to verify safe draft conditions before ignition
- Helps prevent unsafe furnace operation due to blocked flue, failed inducer, or restricted venting
- Designed for reliable, long-service-life performance in residential and light-commercial applications
- Supports two-stage heating systems with separate pressure thresholds for low- and high-fire operation
Application
The 26W45 pressure switch is intended for installation in Lennox two-stage gas furnaces. The dual set points correspond to the low-fire (0.90″ W.C.) and high-fire (1.50″ W.C.) inducer pressure requirements, ensuring the furnace operates safely at both heating stages. Always verify compatibility with your specific Lennox furnace model before installation.
Why Choose an OEM Lennox Pressure Switch?
Using a genuine Lennox replacement pressure switch ensures proper calibration, reliable switching action, and compatibility with your existing control board and wiring harness. Aftermarket substitutes may not meet the precise set-point tolerances required for safe and efficient furnace operation.
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