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Genuine OEM Lennox 84K47 heat exchanger assembly. Inside your Lennox furnace, the heat exchanger moves thermal energy from the combustion chamber into the circulating air stream while keeping flue gases fully contained. The 84K47 is a factory-built replacement, produced to the same specifications as your furnace's original exchanger for accurate fit and consistent heating performance.
Common failure symptoms: Cracks, rust, and metal fatigue typically reveal themselves through a distorted or lifting burner flame, soot accumulation, unusual odors, weak or uneven heat, and short cycling. In severe cases a carbon monoxide detector may sound. Any sign of a cracked exchanger is a safety hazard and calls for prompt replacement rather than repair.
Why OEM matters: Because Lennox tailors each heat exchanger's metallurgy, wall thickness, and gas-pass geometry to a particular furnace model, the genuine 84K47 ensures correct combustion airflow, rated AFUE efficiency, and seamless operation with your unit's safety controls. Installing an OEM part protects your Lennox investment, your warranty, and your household's safety.