OEM Lennox Heat Exchanger Assembly — 47M52

The genuine OEM Lennox 47M52 heat exchanger assembly is the core combustion component of your Lennox gas furnace. It transfers heat from the burning fuel to the air circulating through your home while keeping combustion gases safely separated from the airstream. This factory assembly is engineered to the exact tolerances, alloy, and dimensions Lennox specifies, ensuring proper airflow, rated efficiency, and safe operation.

A failing heat exchanger often reveals itself through cracks, rust or scaling, a flickering or rolling burner flame, soot buildup, or a persistent smell of combustion. In many cases a cracked heat exchanger will trip the furnace's safety limits and cause short-cycling. Because a compromised exchanger can allow carbon monoxide to leak into living spaces, prompt replacement is a critical safety matter — not just a comfort one.

Choosing OEM matters: only the genuine Lennox 47M52 is built to withstand the thermal stress cycles of your specific furnace model without warping or premature metal fatigue. Aftermarket substitutes can fit poorly, disrupt heat transfer, void your warranty, and shorten furnace life. Install the correct factory part and restore your Lennox system to safe, efficient performance.