OEM Lennox Heat Exchanger Assembly — 13X17

The genuine OEM Lennox 13X17 heat exchanger assembly, also identified by factory reference 612989-41, carries heat from your furnace's combustion chamber into the circulating air that warms your home while keeping flue gases completely isolated from your indoor air. Built to Lennox's exact specifications, it delivers the proper airflow, thermal transfer, and combustion safety your gas furnace was engineered to provide.

Signs that this heat exchanger needs replacement include visible cracks or rust, soot or scorching, a flickering, rolling, or yellow burner flame, unusual odors when the furnace runs, and any carbon monoxide detector activation. As a safety-critical part, a cracked or breached heat exchanger should be replaced without delay.

OEM is critical for this component. The Lennox 13X17 is produced from the correct alloy and gauge to resist the repeated thermal stress that causes metal fatigue and cracking over time. Generic replacements can compromise fit, combustion integrity, and warranty coverage — installing the factory-original 612989-41 assembly returns your Lennox furnace to its rated efficiency and original safety specification.