Lennox 11U70 – 104371-07 is an OEM furnace pressure switch designed to verify proper draft and combustion airflow before ignition. This switch actuates at 0.80 inches water column (" W.C.) and is used as a critical safety component in compatible Lennox gas furnaces, ensuring the system operates only when correct negative pressure is present.

The switch monitors inducer performance and venting conditions, helping prevent ignition under unsafe airflow situations. Built to Lennox factory specifications, it provides reliable, repeatable pressure sensing and long-term durability when installed as a direct replacement.

 

Key features:

• OEM Lennox pressure switch
• Actuation point: 0.80" W.C.
• Ensures proper inducer and venting operation
• Safety interlock for furnace ignition sequence
• Direct replacement for Lennox part number 104371-07