Lennox 57M85 Inducer Assembly

The Lennox 57M85 Inducer Assembly is a critical OEM replacement component designed to maintain the precise combustion air requirements for high-efficiency Lennox G61MP series furnaces. Operating at 115V and 60Hz, this 1/30 HP (or 1/20 HP depending on regional load requirements) blower motor delivers a split-speed performance of 3200/2800 RPM, ensuring the optimal removal of flue gases through the heat exchanger. This PSC motor features CWLE rotation and a robust 0.8A draw, providing the necessary negative pressure to activate the furnace pressure switch and initiate the ignition sequence.

For technicians tackling a furnace draft inducer replacement, the 57M85 serves as a direct-fit solution for models ranging from G61MP-36B-045 to G61MPV-36B-070. The assembly includes a factory-installed 7.5 MFD capacitor and is thermally protected with Class B insulation to withstand high-ambient temperatures within the burner compartment. Installing this genuine Lennox 57M85 part ensures the system maintains its original ASHRAE ratings and factory airflow specifications, preventing the common pressure switch trips or "no-heat" calls associated with degraded blower performance.

• OEM Precision: Specifically engineered for Lennox G61MP series furnaces to ensure exact mounting and housing alignment.
• Reliable Combustion: Maintains the exact 3300 RPM (max) airflow required to clear the combustion chamber and exhaust flue gases safely.
• Enhanced Durability: Sealed ball bearings and a thermally protected motor design provide long-term resilience against heat and moisture.
• Quiet Operation: Direct replacement reduces the resonant vibration and mechanical noise often found in third-party "universal" motors.

• What are the symptoms of a failing Lennox 57M85? Common signs include a high-pitched screeching (bearing failure), a humming noise without rotation, or the furnace failing to ignite due to the integrated pressure switch not closing.
• Does this assembly include the gasket? While many OEM Lennox kits include the primary 99M77 gasket, it is best practice to verify or apply high-temp sealant during the draft inducer assembly installation to prevent flue leaks.
• Is this compatible with 80% efficiency furnaces? This model is primarily utilized in high-efficiency (90%+) condensing units like the G61MP series. Always check the furnace rating plate against the Lennox parts catalog before installing.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.