Lennox 57W79 Pressure Switch – 0.70" WC OEM Furnace Safety Control
The Lennox 57W79 Pressure Switch is a factory-calibrated OEM safety component designed to verify proper airflow before ignition in Lennox gas furnace systems. With a setpoint of 0.70 inches water column (WC), this pressure switch ensures that the inducer fan is generating adequate negative pressure before allowing burner ignition, helping prevent unsafe operation and system lockouts.
Equipped with a green identification label, the 57W79 is a reliable replacement for multiple legacy parts and installs easily into compatible Lennox models.
Key Features:
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OEM pressure switch for Lennox furnaces
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Setpoint: 0.70" WC
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Confirms inducer draft before ignition begins
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Helps avoid startup failures and pressure-related error codes
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Includes green label for easy identification
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Ideal for troubleshooting airflow safety faults
Alternate / Replacement Part Numbers:
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57W7901
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101432-14
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10143214
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9370DO-BS-0020
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R45695-004
The Lennox 57W79 pressure switch delivers the dependable airflow safety your furnace needs for smooth and secure operation.
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