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The genuine OEM Lennox 98W38 is a heat exchange assembly repair part (factory reference 605996-57) used to restore the heat transfer section of compatible Lennox furnaces. Built to Lennox factory tolerances, it fits precisely within the exchanger assembly to help maintain proper airflow, combustion separation, and rated heating efficiency.
Common failure symptoms: A deteriorating heat exchanger area commonly presents as weak or inconsistent heat output, a flickering or lifting burner flame, corrosion or soot, popping and expansion sounds on start-up, or repeated tripping of the furnace high-limit safety. Any visible cracking should be inspected promptly due to carbon monoxide risk.
Why OEM matters: Because this part sits in the combustion and heat-transfer path, using the correct OEM 98W38 is critical for safety, fit, and long-term durability. Genuine Lennox parts hold the exact material and dimensional standards required to keep the furnace operating safely and within warranty — assurances aftermarket parts cannot provide.