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The genuine OEM Lennox 10M38 (interchange 605731-18) heat exchanger is the heat-transfer heart of your Lennox gas furnace. As the burners fire, this component absorbs combustion heat and passes it to the air moving across its surface, all while containing exhaust gases within a sealed passage. Built to original Lennox specifications, it delivers the correct temperature rise and airflow characteristics your furnace was designed around.
Common failure symptoms: Watch for a distorted or rolling burner flame, visible rust, cracks, or holes in the metal, soot deposits, a persistent burning smell, or repeated tripping of the high-limit or rollout switches. Any crack in the exchanger can leak carbon monoxide into your home's air, so a suspected failure should be addressed immediately.
Why OEM matters: Heat exchangers are combustion-sealed, safety-critical parts where fit and metallurgy are non-negotiable. The genuine Lennox 10M38 matches the exact dimensions, alloy, and weld quality of the factory unit, ensuring a proper seal and preserving your furnace warranty. Trust the OEM part for a safe and durable repair.