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The Lennox 97J69 is a genuine OEM air pressure switch that monitors air pressure levels within Lennox HVAC systems to verify proper airflow before allowing ignition or continued equipment operation. A defective air pressure switch can cause furnace or air handler lockout, repeated ignition failures, or error codes indicating a pressure fault on compatible Lennox systems. Replacing the 97J69 with this genuine OEM part ensures accurate pressure detection and restores safe, reliable operation to your Lennox equipment.