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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component for the Goodman/Amana ADVC80805CNAA gas furnace. This sheet-metal transition directs combustion byproducts from the heat exchanger collector into the vent connector, maintaining proper draft and a sealed flue path. A damaged, rusted, or ill-fitting transition can leak flue gases and compromise venting safety.
The OEM Goodman transition is stamped to the exact flange pattern and dimensions of the ADVC80805CNAA cabinet, so it seats flush and seals correctly on the first fit. Generic or fabricated substitutes rarely match the factory gasket surfaces and can create draft leaks. For a flue-path part, exact fit is a safety consideration — choose OEM.
Moderate. Replacement involves removing fasteners, transferring or replacing the flue gasket, and re-sealing the connection. Budget 30–45 minutes. Shut off power and gas first, and inspect the vent connector for corrosion while access is open. If you have any doubt about flue integrity, have a licensed technician perform a combustion/draft test after installation.