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The genuine OEM Lennox 10Y64 heat exchanger assembly (factory reference RS39995B001) is the core combustion component in your Lennox gas furnace. It moves heat from the burned gas into the air distributed throughout your home while keeping flue gases sealed away from your indoor air. Built to precise Lennox specifications, this assembly preserves correct airflow, flame stability, and rated heating efficiency.
Common failure symptoms include cracks, rust, or scaling on the exchanger surface, an unsteady or yellow burner flame, booming or popping at ignition, soot accumulation, and rising carbon monoxide levels. Because a cracked heat exchanger is a safety hazard, replacement should be performed by a qualified HVAC technician right away.
Why OEM matters: Lennox furnaces are calibrated to the exact metallurgy and geometry of their factory heat exchangers. An OEM 10Y64 ensures proper heat transfer, secure flue containment, correct fit, and warranty compliance that generic aftermarket parts cannot guarantee. In stock and ships same day before 3PM CST.