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The genuine OEM Lennox 11X47 heat exchanger assembly (factory reference 605996-97, superseding 612219-06) is an exact-fit replacement for compatible Lennox gas furnaces. This component captures heat produced by the burners and transfers it to the circulating air, all while keeping combustion byproducts sealed away from the air you breathe. Operating under constant heat cycling and exposure to flue gases, it is among the most important safety parts in your furnace.
Common failure symptoms include visible cracking or metal fatigue, rust and corrosion, a flame that distorts or rolls out when the blower runs, soot accumulation, unusual smells, and elevated carbon monoxide readings. These indicate the exchanger has lost its integrity and should be replaced without delay.
Why OEM matters: Lennox engineers the 11X47 to match the furnace's exact combustion geometry, metal gauge, and clearances. That precision preserves rated AFUE efficiency, correct flame characteristics, and a proper gas-tight seal against dangerous flue leakage. Aftermarket alternatives risk poor fit and reduced safety. Install genuine Lennox parts to protect performance, warranty coverage, and household safety.