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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM venting component for the ADVC80603BXBB gas furnace. This transition piece connects the furnace's flue collector/vent outlet to the chimney or vent connector, routing combustion byproducts safely out of the appliance. A properly fitted, sealed transition is essential for correct draft and for keeping flue gases contained — a corroded or ill-fitting transition can leak combustion products or disrupt venting.
Venting parts must match the factory outlet dimensions and draft characteristics. This genuine OEM transition guarantees the correct fit and clearances. Generic or fabricated pieces risk leaks and improper draft. For any part in the flue path, OEM is the responsible choice.
Moderate. Power and gas off; remove existing vent fasteners/sealant, fit the new transition, then re-seal and re-secure the vent connection. 30–40 minutes with hand tools. Because this is part of the flue system, a professional draft/combustion check after installation is recommended.