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The genuine OEM Lennox 13U55 is a stainless steel heat exchanger assembly rated for 480,000 BTU applications, making it suited to large-capacity and commercial Lennox furnaces. This heat exchanger transfers combustion heat into the supply air while isolating flue gases from the conditioned airstream. Its stainless steel build is chosen for high-output units where sustained thermal cycling and corrosion resistance are essential.
Common failure symptoms: Watch for visible cracking or corrosion, a burner flame that rolls out or disturbs when the blower starts, soot deposits, unexplained odors, and recurring high-limit or flame-sensor lockouts. In high-BTU equipment a degraded exchanger sharply reduces heating capacity and poses a carbon monoxide hazard, so prompt replacement is critical.
Why OEM matters: At 480K BTU, exact tube geometry, alloy grade, and sealing surfaces are vital for safe, efficient combustion. The genuine Lennox 13U55 is factory-matched to deliver correct fit, rated heat transfer, and safe flue containment while keeping your Lennox equipment within warranty. Aftermarket alternatives cannot guarantee these tolerances.