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The genuine OEM Lennox 33M67 heat exchanger assembly (factory reference LB-94782Y) is the core combustion component of your Lennox gas furnace. It transfers heat from the burning fuel to the circulating air stream while keeping combustion byproducts safely separated from your home's breathable air. This assembly is engineered to the exact dimensions, alloy, and metallurgical specifications required for your Lennox furnace model, ensuring proper airflow and rated efficiency.
Common failure symptoms: A cracked or corroded heat exchanger often shows up as a flickering or rolling burner flame, soot buildup, unusual odors, or repeated flame-sensor and limit-switch trips. In severe cases it can allow carbon monoxide to enter the supply air — making prompt replacement a safety priority, not just a comfort issue.
Why OEM matters: Because the heat exchanger is a combustion and safety-critical part, only a genuine Lennox 33M67 assembly guarantees correct fit, sealing, and heat-transfer performance. Aftermarket substitutes can compromise the flue seal, void your warranty, and create dangerous combustion conditions. Choose the factory OEM part to restore safe, efficient, code-compliant operation.