OEM Lennox Draft Inducer Motor Assembly — 35K70

The genuine OEM Lennox 35K70 draft inducer motor assembly pulls combustion gases through the heat exchanger and safely out the flue on your Lennox furnace. It runs before and during each heating cycle to establish proper draft, clear the combustion chamber, and satisfy the pressure switch so the burners can safely ignite. This complete assembly is a cornerstone of both furnace safety and efficient combustion.

When the 35K70 begins to fail, common symptoms include the furnace failing to ignite, a pressure switch open fault, loud humming or squealing bearing noise, rattling from the inducer housing, or the blower motor spinning slowly or not at all. A failed inducer will lock the furnace out because the control board cannot confirm safe venting.

OEM matters because the 35K70 is matched to your Lennox furnace's airflow, pressure switch calibration, and mounting requirements. An improperly rated aftermarket inducer can fail to trigger the pressure switch, cause nuisance lockouts, or vent inadequately. The factory-specified Lennox assembly ensures correct draft, safe combustion venting, and reliable ignition for your Lennox equipment.