OEM Lennox Heat Exchanger Assembly — 58L50

The genuine OEM Lennox 58L50 heat exchanger assembly is the core heat-transfer component of your Lennox gas furnace. Hot combustion gases travel through its sealed clamshell passages while the circulating blower moves your home's air across the outside surfaces, delivering warm air to the ductwork while keeping flue gases fully separated from the living space. It's manufactured to the precise tube path and mounting geometry Lennox specifies for your model.

Common failure symptoms: a failing heat exchanger typically produces a wavering or lifting burner flame, soot or rust accumulation in the burner compartment, a metallic odor when heating, nuisance carbon monoxide alarms, or recurring flame-rollout and high-limit trips. Because cracks allow combustion byproducts to enter the airstream, a damaged exchanger is a safety hazard that calls for prompt replacement.

Why OEM matters: the 58L50 is engineered to match your furnace's burner rating, gas valve, and airflow design. Choosing the genuine Lennox part preserves factory combustion tuning and correct heat rise, keeps your safety certification and warranty valid, and guarantees a proper fit — aftermarket alternatives can compromise efficiency and safe operation.