OEM Lennox Blower Wheel — 21708

The genuine OEM Lennox 21708 blower wheel — often called a squirrel cage — is the forward-curved fan responsible for circulating air throughout your HVAC system. Attached to the blower motor shaft, its curved blades pull air across the heat exchanger or evaporator coil and drive it into your home's ductwork. Precision-balanced from the factory, the 21708 produces the exact airflow volume your Lennox equipment requires for reliable, quiet performance.

Common failure symptoms: When the 21708 blower wheel wears out, you'll often notice diminished airflow at the registers, excessive vibration, and a rattling, thumping, or scraping noise from the blower housing. Cracked or broken blades, an unbalanced wheel, or a hub that has loosened on the shaft all cause the wheel to spin off-center — accelerating motor bearing wear and reducing efficiency. Caked-on dust and debris compound the imbalance.

Why OEM matters: Proper airflow relies on the precise blade pitch, wheel diameter, and factory balance of the blower wheel. The Lennox OEM 21708 is built to your system's specifications, ensuring correct fit, rotation direction, and rated CFM output for effective heat transfer and energy efficiency. Aftermarket wheels with off-spec dimensions introduce vibration, noise, and airflow loss. Choose the genuine OEM part for balanced, dependable operation.