OEM Lennox Heat Exchanger Assembly — 88H15

The genuine OEM Lennox 88H15 heat exchanger assembly (factory reference R20052104) is the core heating component of your Lennox gas furnace. It transfers heat from the sealed combustion process to the circulating air stream while keeping combustion byproducts safely separated from the air your family breathes. Its precise geometry is engineered for your specific furnace model to deliver rated efficiency and safe operation.

Warning signs of a compromised heat exchanger include visible cracks or rust, soot buildup, a flickering or shifting burner flame when the blower starts, unusual odors, and — most critically — elevated carbon monoxide readings. A cracked heat exchanger is a serious safety hazard and is a common reason a technician will red-tag and shut down a furnace until it is replaced.

Only the OEM Lennox 88H15 matches the exact metallurgy, weld pattern, and dimensions your furnace requires for a safe seal and proper flame containment. Aftermarket substitutes risk improper fit, compromised combustion separation, and voided warranties. This assembly is typically covered under Lennox's limited heat exchanger warranty — always have installation performed by a qualified HVAC professional.