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The genuine OEM Lennox 96M78 Heat Exchanger Assembly with Vest Panel is the primary heat-transfer component of your Lennox gas furnace. As the burners fire, combustion gases travel through this assembly and transfer their heat to the circulating air stream while safely venting exhaust away from your home. The included vest panel provides the correct structural mounting and airflow sealing designed specifically for compatible Lennox furnace models, ensuring an exact factory fit.
Common failure symptoms: a cracked or corroded heat exchanger is one of the most serious furnace faults. Warning signs include a flickering or rolling burner flame, soot buildup, unusual rumbling or rattling on ignition, water or rust streaks near the unit, and repeated furnace shutdowns triggered by the safety limit or flame-rollout switch. Most critically, a compromised heat exchanger can allow dangerous carbon monoxide to enter your living space, which is why prompt replacement is essential.
Why OEM matters: the heat exchanger is a safety-critical, pressure- and temperature-rated part. The OEM Lennox 96M78 is manufactured to the exact alloy, wall thickness, and dimensional tolerances your furnace was certified with, preserving proper combustion sealing, efficiency, and warranty compliance. Generic substitutes risk poor fit, premature cracking, and CO hazards. Insist on the OEM part to protect your equipment and your family.