OEM Lennox Blower Wheel — 21709

The genuine OEM Lennox 21709 blower wheel — also called a squirrel cage — is the forward-curved fan that moves conditioned air through your ductwork. Mounted to the blower motor shaft, its precisely angled blades draw air across the heat exchanger or coil and push it into your home. Factory-balanced construction lets the 21709 deliver the rated CFM your Lennox system was designed to produce, quietly and efficiently.

Common failure symptoms: A failing 21709 blower wheel typically causes weak or reduced airflow from the vents, loud vibration or a wobbling, rattling noise from the blower compartment, and uneven heating or cooling. Cracked blades, an out-of-balance wheel, or heavy dirt buildup throw the wheel off-center, straining the motor bearings and driving up energy use. A loose hub that slips on the shaft is another frequent culprit.

Why OEM matters: Airflow performance depends on the exact blade geometry, diameter, and balance of the blower wheel. The factory Lennox 21709 is engineered to your unit's specifications for a true fit, correct rotation, and rated air delivery — critical for proper heat exchange and system efficiency. Generic wheels with slightly different dimensions cause vibration, noise, and reduced capacity. Install the OEM part for smooth, balanced airflow.