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Genuine OEM Lennox 23M98 heat exchanger assembly, also cataloged as service kit LB-94782G. This component transfers combustion heat to the air moving through your Lennox furnace while sealing off toxic flue gases from your home's supply air. It is one of the most important safety and efficiency components in the entire heating system.
Common failure symptoms: Watch for cracks or rust on the exchanger walls, a burner flame that flutters or rolls out when the blower engages, banging or pinging noises as the metal expands and contracts, soot accumulation, and carbon monoxide alarms. Many homeowners also notice weaker heat output and higher gas bills as a compromised exchanger loses efficiency.
Why OEM matters: Because a failed heat exchanger can leak carbon monoxide, this is not a part to improvise on. The factory 23M98 assembly is manufactured to precise Lennox dimensions and metallurgy for a leak-tight fit and correct combustion airflow. Non-OEM parts can warp, seal poorly, or crack early. Installing the genuine Lennox exchanger safeguards your household and keeps your equipment operating exactly as engineered.