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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue component for the ADVC80603BNAA gas furnace. This transition piece channels hot combustion gases from the heat exchanger collector box up into the vent connector, forming a critical part of the furnace's venting path. A rusted, cracked, or deformed transition can leak flue gases, disrupt draft, and compromise safe operation.
This genuine Goodman OEM transition is stamped to the precise geometry of the ADVC80603BNAA cabinet and vent outlet. A generic or hand-fabricated substitute rarely seals correctly, risking flue-gas leakage and draft problems. For a venting component, OEM fitment is the responsible choice.
Moderate — Involves disconnecting the vent connector, removing the old transition, and sealing the new piece with high-temperature fasteners and approved sealant. Because it affects combustion venting, a qualified technician should verify proper draft after installation.