Lennox 11U72 Pressure Switch 0.90" W.C. SPST Normally Open

The Lennox 11U72 (OEM Part Number 104371-09) is a genuine OEM pressure switch designed for residential and light commercial gas furnaces. This critical safety component monitors air pressure within the system to confirm proper inducer motor operation and adequate airflow before allowing ignition to occur.

Key Specifications:

• Actuation Pressure: 0.90" W.C. (water column)
• Configuration: SPST-N.O. (Single Pole Single Throw - Normally Open)
• Contact Rating: 5 Amp Resistive at 24 VAC
• Pressure Rise Setting: +0.55" W.C.
• Weight: 0.25 lbs
• Includes mounting bracket

Features and Benefits:

• Genuine Lennox OEM replacement part ensures perfect fit and reliable operation
• Prevents furnace ignition under unsafe airflow conditions
• Factory-calibrated pressure settings for consistent performance
• Compatible with select Lennox and Allied Air furnace models
• Helps maintain energy efficiency and system reliability

This pressure switch is essential for maintaining safe furnace operation by verifying that the inducer motor has created sufficient negative pressure before the ignition sequence begins. Replaces older Lennox part numbers including 103614-19 and 103614-09.