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The genuine OEM Lennox 19H85 is a stainless steel (SS) heat exchanger rated for 70,000 BTU (factory reference 607167-06), engineered as a direct-fit replacement for compatible 70K-input Lennox gas furnaces. The heat exchanger transfers heat from the burners to the air moving through the furnace while sealing combustion gases away from your home's airstream. Its stainless steel construction offers strong resistance to corrosion and thermal fatigue for long service life in demanding heating applications.
Common failure symptoms include cracks, holes, or warping in the exchanger, rust and scale buildup, a burner flame that flutters or rolls out when the blower starts, soot deposits, unusual odors during operation, and elevated carbon monoxide readings. A failed exchanger is a safety hazard and must be replaced, not repaired.
Why OEM matters: Lennox sizes the 19H85 precisely for 70K BTU input, matching the furnace's combustion geometry, metal specification, and clearances. That exact fit preserves rated efficiency, correct flame behavior, and gas-tight sealing against flue leakage. Aftermarket substitutes can't guarantee the same performance or safety. Install genuine Lennox parts to protect efficiency, warranty coverage, and household safety.