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The 0128F00006 is a genuine OEM Goodman chimney transition bottom designed for the ACVC801005CXAA gas furnace and compatible Goodman/Amana 80% AFUE models. This sheet-metal flue-vent component forms the bottom transition between the furnace's induced-draft outlet and the vent connector / chimney, channeling combustion products safely out of the cabinet. A rusted or deformed transition leaks flue gas and disrupts draft, so an exact-fit OEM replacement is essential for safe venting.
The OEM transition is formed to Goodman's exact cabinet cutout and draft geometry, so it bolts up flush and maintains the designed venting path. Generic or fabricated transitions rarely match the flange pattern and can create leaks or draft problems that trip the pressure switch. For a code-compliant venting repair, use the genuine OEM part.
Moderate (3/5). Power down the furnace, remove fasteners securing the old transition, and install the replacement with proper gasketing/sealant. Verify draft and check for flue-gas leakage with a combustion analyzer after install. Best handled by an HVAC technician.