Lennox 25B95 - Lennox 104549-22, 2-Stage Pressure Switch, Set Point High 0.75" W.C.; Set Point Low 0.35" W.C.

 

Product Description

The Lennox 25B95 pressure switch, also referenced as Lennox part number 104549-22, is a genuine 2-stage pressure switch designed for reliable operation in compatible Lennox gas furnaces. This switch plays a critical safety and control role by monitoring proper airflow and venting conditions, ensuring the furnace operates only when correct pressure levels are achieved.

Manufactured to Lennox factory specifications, this 2-stage pressure switch features precise set points to accurately manage low-fire and high-fire operation. It helps maintain efficient furnace performance, supports proper staging, and protects the system from unsafe operating conditions caused by blocked vents, inducer issues, or airflow restrictions.

This is a direct replacement OEM component from Lennox, engineered for exact fit, dependable performance, and long service life. Ideal for professional HVAC technicians and experienced homeowners performing repairs on compatible Lennox furnace models.

Product Overview
The Lennox 25B95 / 104549-22 2-stage pressure switch monitors negative pressure generated by the inducer motor and confirms safe draft conditions before ignition and during operation. Separate pressure set points allow the furnace control board to correctly manage low-stage and high-stage firing, supporting energy efficiency and consistent heating performance.

 

Specifications

Manufacturer: Lennox
Part Number: 25B95
Alternate Part Number: 104549-22
Switch Type: 2-Stage Pressure Switch
Set Point High: 0.75 inch W.C.
Set Point Low: 0.35 inch W.C.
Application: Gas furnace airflow and venting safety control
Compatibility: Designed for specific Lennox furnace models

 

This OEM Lennox pressure switch is recommended whenever a faulty or out-of-calibration switch causes pressure-related fault codes, short cycling, or failure to ignite. Always verify compatibility with your furnace model before ordering.