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The genuine OEM Lennox 84K45 heat exchanger assembly is the central heat-transfer component of your Lennox gas furnace. It captures the heat produced during combustion and passes it to the circulating air stream, all while safely isolating and venting exhaust gases. Manufactured to Lennox factory standards, it installs as a direct-fit replacement in compatible furnace models.
Common failure symptoms: Telltale signs of a failing exchanger include visible cracking or rust, a burner flame that distorts or lifts when the blower engages, soot deposits, unusual odors, and repeated shutdowns from the safety limit or flame-rollout switch. Since cracks can release carbon monoxide into your home's air, a suspect heat exchanger is a safety-critical repair that should be addressed immediately.
Why OEM matters: The authentic Lennox 84K45 exchanger matches the original in metallurgy, chamber geometry, and tolerances, guaranteeing a proper seal, correct heat transfer, and long-term reliability. Non-OEM parts can undermine fit, efficiency, and safety, and may void your equipment warranty. Trust the genuine Lennox part to protect your furnace and your family.