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Genuine OEM Lennox 10M86 stainless steel heat exchanger assembly, rated for 65,000 BTU furnace applications. The heat exchanger transfers heat from the burner combustion into the air flowing across your Lennox furnace while keeping flue gases sealed away from your home's air supply. Its corrosion-resistant stainless steel construction is built to Lennox factory specifications for durability, efficient heat transfer, and long service life.
Common failure symptoms: Look for cracks or splits in the exchanger, surface rust or corrosion, a burner flame that lifts or turns yellow when the blower engages, soot buildup, unusual odors, and repeated flame-rollout or high-limit switch trips. Since a breached exchanger can release carbon monoxide into the airstream, replacement should be treated as an urgent safety repair.
Why OEM matters: The 65K BTU rating, stainless alloy, and precise dimensions of the 10M86 are matched to your specific Lennox furnace model. A genuine OEM assembly guarantees correct fit, a proper combustion seal, and the efficiency and safety certification your equipment was designed to deliver. Choosing OEM protects your warranty and ensures the exchanger stands up to years of thermal cycling.