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The Goodman 4821402S is a genuine OEM 4-cell heat exchanger engineered as a direct-fit replacement for the GMNTE080-4 80,000 BTU gas furnace. The heat exchanger is the heart of the furnace — combustion gases pass through its four aluminized-steel cells while blower air flows across the outside, transferring heat to your home while keeping toxic flue gases fully separated from the air stream. A cracked or rusted-through heat exchanger is a carbon monoxide hazard and is the most common reason a furnace is red-tagged. This OEM replacement restores safe, efficient, code-compliant heating.
Heat exchangers are precision combustion components — cell geometry, flange pattern, and burner alignment must match exactly. This genuine Goodman OEM exchanger guarantees correct flame carry-over, drop-in fitment, and warranty compliance. Generic exchangers are effectively nonexistent for this platform, and any mismatch risks CO leakage. Always use OEM.
Advanced — 5 out of 5. A full teardown: the furnace is disassembled to remove burners, manifold, gas valve, and blower before the exchanger can be swapped. Requires combustion analysis and CO testing on completion. Many Goodman furnaces carry a lifetime or 20-year heat exchanger warranty — check your registration, as this part may be covered.
This is a life-safety combustion component. Installation must be performed by a licensed HVAC professional with a calibrated combustion analyzer.