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The genuine OEM Lennox 19A67 aluminized heat exchanger assembly transfers combustion heat to the circulating air in your Lennox gas furnace while keeping the burner's toxic flue gases fully separated from the air you breathe. The aluminized-steel construction resists oxidation and delivers the durable, efficient heat transfer Lennox engineers into its furnace platforms, making this a foundational part for consistent, safe heating performance.
Common failure symptoms: Watch for cracks or holes in the exchanger walls, flame distortion or rollout when the blower engages, unusual rumbling or booming on ignition, visible rust and flaking, soot deposits, or a carbon monoxide detector activation. Any of these signs indicates the exchanger has lost its integrity and should be replaced immediately to protect your home.
Why OEM matters: The 19A67 is dimensioned to Lennox's exact burner alignment, cell spacing, and airflow path. Generic substitutes can misalign with the burner assembly, create hot spots that shorten component life, and void your equipment warranty. Choosing the OEM assembly ensures a direct factory fit, correct combustion clearances, and the rated safety and efficiency of your Lennox furnace. Installation should be performed by a licensed HVAC professional.