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The genuine OEM Lennox 15W84 (LB-112079C) gas heat exchanger repair part assembly is the core combustion component of your Lennox furnace. As combustion gases pass through its chambers, the heat exchanger transfers heat to the circulating air stream while safely containing and venting exhaust and carbon monoxide away from your home. This is a direct factory-engineered replacement built to the exact tolerances and material specifications of your Lennox equipment.
Common failure symptoms: A failing heat exchanger often shows visible cracks or rust, flickering or rolling burner flames, soot buildup, unusual odors, or a tripping flame sensor. The most serious sign is elevated carbon monoxide readings — a cracked heat exchanger is a safety hazard and should be replaced immediately.
Why OEM matters: Heat exchangers are safety-critical components. Aftermarket or improperly fitted assemblies can leak combustion gases, void your warranty, and fail to meet Lennox's certified efficiency and containment standards. The OEM 15W84 ensures a precise fit, proper flame containment, and rated performance for your specific Lennox model.