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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue-vent component engineered for the Amana/Goodman AMES800403AXAA 80% AFUE gas furnace and compatible models in the AMES80 family. This transition piece forms the bottom of the flue collector-to-vent connection, directing combustion byproducts safely into the venting system. Using the exact OEM part preserves the factory draft path and flue seal integrity.
This is a genuine OEM Goodman/Amana part, built to the original dimensional and material spec. Unlike generic aftermarket transitions, it drops in without trimming or field modification and maintains the manufacturer-approved flue geometry — important for a component that handles hot combustion gases. Generic alternatives may vary in flange fit and metal gauge, risking leaks or improper draft.
Difficulty: Moderate. Replacement requires shutting off gas and power, disconnecting the existing flue transition, and reseating the new piece with proper fasteners and high-temp sealant where applicable. Because this part is part of the venting system, we recommend a licensed HVAC technician verify draft and check for flue-gas leaks after installation.
Backed by our fit guarantee for the AMES800403AXAA. Questions? Contact info@nationalhvacparts.com.