Lennox 21709 Blower Wheel

The Lennox 21709 Blower Wheel is a critical OEM replacement part engineered for high-performance air delivery in residential and commercial furnace blower assemblies. This 10-5/8" x 7-1/8" centrifugal blower wheel features a 1/2" bore size and a robust 1-set screw design to ensure a secure, vibration-free connection to the direct drive blower motor shaft. Designed for clockwise (CW) rotation (hub end), this wheel provides precise 48-blade alignment for optimal static pressure handling in 80MGF3-60A-12 and 80MGF3-75A-01 units. Veteran techs know that an imbalanced wheel leads to premature bearing wear and catastrophic HVAC blower motor failure; replacing a warped or debris-laden wheel restores quiet operation and design-rated CFM output. Field testing confirms that using the Lennox 21709 ensures seamless fitment without the clearance issues often found with aftermarket "universal" alternatives. This heavy-duty assembly is built for rigorous multi-stage heating and cooling cycles within Lennox air handlers and gas furnaces.

• OEM Compatibility: Precision-fit for Lennox 80MGF3 series furnace blowers and various Allied/Armstrong cross-references.
• Durable Construction: High-grade metal blades designed to resist flexing and maintain airflow efficiency under high static load.
• Reduced Vibration: Dynamically balanced to eliminate rattling and extend the life of the blower motor bearings.
• Direct Fit: Standard 1/2 inch bore and clockwise rotation facilitate rapid field replacement during service calls.

Common Questions

What are the signs that a Lennox 21709 blower wheel needs replacement?
Technicians should look for rattling or banging noises, metal fatigue on the blades, or a separated center disc. If you notice reduced airflow or excessive motor vibration that isn't solved by cleaning, the wheel is likely out of balance or bent.

Is this a direct replacement for Lennox part number LB-29333BH?
Yes, the 21709 is the current Lennox replacement part for legacy numbers including 54C95, 74H04, and LB-29333BH, maintaining identical technical specifications for bore, diameter, and width.

Does this blower wheel include the set screw?
Standard 21709 assemblies include a pre-installed 1-set screw for mounting to the flat of the blower motor shaft, ensuring a locked, secure installation.

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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.