OEM Lennox Heat Exchanger Assembly — 67M79

The genuine OEM Lennox 67M79 heat exchanger assembly is the core component that transfers heat from the combustion process to the air circulating through your furnace, all while keeping combustion byproducts safely separated from your home's air supply. Precision-engineered to Lennox factory specifications, it ensures proper airflow, rated efficiency, and reliable operation across compatible Lennox gas furnace platforms.

Common failure symptoms: A failing heat exchanger often shows up as visible cracks or rust, a flickering or shifting burner flame, soot buildup, unusual odors, or a furnace that repeatedly trips on the high-limit switch. Because a compromised heat exchanger can allow carbon monoxide to enter the airstream, any suspected crack should be treated as a safety issue and addressed immediately.

Why OEM matters: Lennox heat exchangers are built to exact dimensional, metallurgical, and pressure tolerances. The OEM 67M79 guarantees correct fit and burner alignment, preserves your furnace's safety certifications, and protects any remaining manufacturer warranty — something aftermarket substitutes cannot reliably deliver on a safety-critical part.