OEM Lennox Combustion Air Blower, 2-Speed — 19C46

The Lennox 19C46 (factory reference 105223-02) is a genuine OEM 2-speed combustion air blower for Lennox gas furnaces. It draws combustion air across the burners and vents flue gases safely outdoors, creating the negative pressure the furnace's pressure switch must confirm before the igniter and gas valve energize. Dual-speed operation tailors draft to each burner stage for smoother, quieter heating.

Common failure symptoms: no ignition and repeated pressure-switch lockouts, loud grinding or squealing during the pre-purge cycle, an inducer wheel that wobbles or won't turn, intermittent no-heat calls, or a motor that overheats and drops out. These usually trace to failed bearings, a cracked or loose wheel, or a burned-out winding.

Why OEM matters: the 19C46 is matched to your Lennox furnace's exact airflow, mounting, and voltage specifications. Installing the OEM part keeps pressure-switch timing accurate, maintains rated combustion efficiency, and protects the factory safety chain — something aftermarket look-alikes with different CFM or wheel dimensions can compromise.