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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue-vent component for the AMH80604BNAA gas furnace. This sheet-metal transition routes combustion byproducts from the furnace's induced-draft assembly into the vent connector, maintaining the correct draft path and clearances specified by Goodman. A properly fitted transition is essential for safe venting and to keep flue gases out of the living space.
OEM vs. Generic: This transition is dimensioned to Goodman's exact vent geometry and clearance requirements. A generic or hand-fabricated substitute risks improper draft, leaks at the seams, and code-compliance issues on inspection. The OEM part drops in without cutting or rework.
Installation difficulty: Moderate. Plan on 30–45 minutes. You'll need to disconnect the existing vent connector, remove the old transition, and secure the replacement with the original screws and approved sealant/tape. Verify draft after installation. Because this affects combustion venting, a licensed HVAC professional should confirm proper draft and spillage clearance if you are not experienced with flue work.