OEM Lennox Heat Exchanger Assembly — 57M97

The genuine OEM Lennox 57M97 heat exchanger assembly is the central heat-transfer component in your Lennox gas furnace, moving thermal energy from the combustion chamber into the air that warms your home while safely containing and venting flue gases. Built to Lennox's precise engineering tolerances, this assembly ensures the correct fit, secure sealing, and efficient performance your furnace was designed around.

Watch for these signs of heat exchanger failure: visible cracking or corrosion, a flame that flutters or turns yellow when the blower kicks on, soot buildup around the burners, a metallic or chemical odor, and repeated furnace shutdowns triggered by the high-limit switch. A cracked heat exchanger can allow carbon monoxide into your living space, making prompt replacement a serious safety priority.

An OEM Lennox 57M97 replacement is the only responsible choice for this safety-critical part. Authentic Lennox manufacturing delivers the exact steel gauge, weld strength, and mounting geometry needed for a leak-free seal and proper fit. Genuine parts protect your warranty, maintain rated combustion efficiency, and give you confidence that your furnace will run safely and reliably.