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The genuine OEM Lennox 98W43 heat exchange assembly (factory part 605996-62) is a direct-replacement repair component for your Lennox gas furnace. The heat exchanger is where combustion heat is transferred into the circulating air that warms your home, all while flue gases stay sealed inside the assembly and out of your living space. It is manufactured to the original Lennox specifications for a precise, reliable fit.
Common failure symptoms: As a heat exchanger ages it can crack, rust through, or fatigue from repeated heating cycles. Watch for a flame that flutters when the blower starts, soot deposits, metallic or burning odors, recurring high-limit shutdowns, and any carbon monoxide alarm activity. A compromised exchanger should be replaced immediately for safety.
Why OEM matters: Because it directly affects combustion safety and efficiency, this is a part where genuine matters. The authentic Lennox 98W43 ensures correct alignment, rated heat transfer, and continued compliance with the furnace's factory safety certification. Aftermarket alternatives can cause airflow issues, void warranties, and introduce safety risks. Insist on OEM for a dependable repair.