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The Goodman 4821400S is a genuine OEM 14 inch, 2-cell heat exchanger engineered as a direct-fit replacement for Goodman GMNT040-3 gas furnaces and compatible Goodman/Amana models. The heat exchanger is the heart of the furnace — combustion gases pass through its cells while blower air flows over the outside, transferring heat to your home while keeping flue gases fully separated from the airstream. A cracked or rusted exchanger is a safety hazard that can leak carbon monoxide, so timely OEM replacement is essential.
A heat exchanger is a life-safety component, and this genuine Goodman part is built to the exact cell geometry, metal gauge, and burner alignment of the original. Aftermarket exchangers can vary in weld quality and dimensional tolerance, risking flame impingement, condensation, and premature cracking. For a part that separates you from combustion byproducts, only OEM belongs in the furnace.
Advanced (5 of 5). This is a major repair requiring near-complete furnace teardown — burner, gas valve, and blower removal — plus proper burner realignment and combustion verification afterward. This job should be performed only by a licensed HVAC technician, and combustion and CO testing must be completed before returning the furnace to service.