OEM Lennox Draft Inducer Motor Assembly — 81W45

The genuine OEM Lennox 81W45 draft inducer motor assembly pulls combustion air through the heat exchanger and pushes flue gases out through the vent before and during furnace firing. It creates the negative pressure the pressure switch senses to confirm safe airflow, making it a critical link in your Lennox furnace's ignition sequence.

Failing draft inducer assemblies often announce themselves with loud humming, grinding, or rattling noises, a motor that runs hot or intermittently, or a furnace that won't ignite because the pressure switch never closes. Worn bearings, a seized wheel, or a burned-out winding will typically produce an open-pressure-switch lockout and no heat.

An OEM Lennox 81W45 arrives with the correct wheel, housing, and electrical characteristics matched to your system, so the inducer moves the exact airflow the control board and pressure switch expect. Generic replacements can push the wrong CFM and cause nuisance lockouts or unsafe venting. Installing the factory-specified assembly restores proper draft, safe combustion, and quiet operation.