Lennox 99K57 Inducer Assembly

The Lennox 99K57 Inducer Assembly is a critical OEM replacement component designed to maintain the mechanical integrity and venting safety of high-efficiency gas furnaces. This complete inducer assembly features a 1/10 HP, 208-230V PSC motor engineered for a 3200 RPM operating speed with counter-clockwise rotation (CCWLE). As a veteran tech knows, the 99K57 draft inducer is essential for clearing the heat exchanger of combustion gases and proving the pressure switch circuit to initiate the ignition sequence. This Lennox furnace part is a direct replacement for legacy part numbers such as 98G87, 98G8701, and 99K5701, ensuring a drop-in fit without needing to field-modify the combustion air blower housing. Built with sealed ball bearings and a factory-mounted 4 MFD capacitor, this replacement inducer motor is designed to withstand the high-temperature environment of consistent heating cycles while preventing common pressure switch errors and vibration-induced noise.

• OEM Compatibility: Exact fit for specific Lennox, Armstrong, and Ducane units, eliminating the need for universal brackets or wiring modifications.
• Complete Setup: Includes the PSC motor, blower wheel, and rugged housing for a faster "pancake" style swap-out.
• Industrial Build: Features a thermally protected motor and sealed ball bearings to resist internal friction and heat-related failure.
• Performance Precision: Calibrated to 3200 RPM to ensure proper static pressure and reliable pressure switch closure.

What are the symptoms of a failing Lennox 99K57 inducer?
Technicians typically encounter seized bearings, which manifest as a high-pitched screeching, or a failed motor winding that prevents the furnace from moving past the pre-purge cycle. If the motor doesn't reach full RPM, the pressure switch will stay open, preventing ignition.

Is the capacitor included with this assembly?
Yes, this Lennox 99K57 comes with a pre-mounted and wired 4 MFD at 370VAC capacitor, ensuring the motor has the necessary torque for a clean start-up under load.

What furnace models utilize this specific assembly?
This 99K5701 inducer is frequently found in G61MPV and GHR series units, as well as several 90% AFUE and higher multi-position furnaces across the Allied Air brand family.

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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.