OEM Lennox 2-Stage Heat Exchanger Assembly — 14D80

The genuine OEM Lennox 14D80 heat exchanger assembly (superseding 614580-49, formerly 612224-41) is the primary combustion component in compatible two-stage Lennox gas furnaces. It transfers heat from the burner flame to the air moving across it while keeping combustion gases fully separated from your home's air supply. Its two-stage design supports the modulating firing rates that give these furnaces their quiet operation and improved seasonal efficiency.

Common failure symptoms: A failing or cracked heat exchanger often shows up as a flickering or roll-out burner flame, a rumbling or clicking sound during heating cycles, visible rust, soot, or corrosion, and uneven heating. Because cracks can allow carbon monoxide to enter the airstream, a compromised heat exchanger is a safety concern that should be addressed immediately — a CO detector trip is a serious warning sign.

Why OEM matters for Lennox: Heat exchangers are precision-formed for the exact burner geometry, tubing pattern, and airflow of your specific Lennox furnace. The factory 14D80 assembly guarantees correct fit, rated heat transfer, and the safety clearances Lennox engineered into the unit. Aftermarket or universal substitutes risk improper combustion, void warranties, and compromise the sealed barrier that protects your home. Choose OEM for safe, code-compliant, long-lasting performance.