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The Goodman/Amana 0128F00006 chimney transition bottom is the factory flue-vent fitting that adapts the induced-draft blower outlet on the AMVC80803BNBD and related Goodman/Amana 80% AFUE furnaces to the vent connector. This component maintains a properly sized, leak-resistant pathway for combustion byproducts, ensuring correct draft and safe venting of flue gases up the chimney or vent pipe.
Venting components are dimensionally precise. This genuine OEM transition is stamped to the exact flange and bolt pattern of your furnace, so it seats flush and pairs correctly with the factory gasket. Generic substitutes often introduce gaps that leak flue gas or disturb draft. For a combustion-venting part, OEM is strongly recommended for safety.
Rating: Easy (2/5). Installs in roughly 15–30 minutes with basic hand tools. Inspect and replace the associated flue gasket at the same time, and confirm a proper draft after reassembly. Because this part is on the combustion-venting path, verify there are no leaks with a combustion analyzer or have a licensed technician confirm safe operation.