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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue and vent component engineered for the AMS80804BXAD furnace. It forms the lower junction of the venting path where combustion byproducts exit the heat exchanger, ensuring a proper seal and correct draft alignment for safe, code-compliant operation.
The OEM version is stamped and formed to Goodman's exact factory tolerances for a drop-in fit with no field modification. A generic equivalent may require minor trimming or resealing to match the vent collar. For a safety-critical flue component, we recommend OEM.
Moderate. Requires shutting off gas and power, disconnecting the vent, and resealing with approved high-temp materials. Best performed by an HVAC professional. Always verify draft after reassembly.