Lennox 26W85 Two-Stage Pressure Switch 0.90/1.30 IWC

The Lennox 26W85 is a dual-stage pressure switch designed for use in residential and light commercial HVAC furnace systems. This OEM replacement component monitors differential air pressure to ensure safe and efficient furnace operation by verifying proper venting conditions.

Key Specifications:

• Manufacturer Part Number: 26W85
• Alternate Part Number: 101021-09
• Two-stage design with set points at 0.90" and 1.30" inches water column (IWC)
• Verifies proper inducer motor operation and vent pressure
• Direct OEM replacement for Lennox furnace systems
• Safety-critical component that prevents furnace operation under unsafe venting conditions

This pressure switch is a genuine Lennox factory part engineered to exact specifications for reliable performance and proper safety system operation. The dual-stage functionality allows the furnace control board to monitor two distinct pressure thresholds during the heating cycle, ensuring optimal combustion air flow and safe venting.