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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component that channels combustion gases from the furnace's vent outlet into the chimney connector on the ACVC801005CXAB furnace. A properly fitted transition ensures a sealed, leak-free flue path — critical for safe venting of carbon monoxide and other combustion byproducts away from the living space.
The OEM Goodman transition is stamped to the exact dimensions of this furnace's vent outlet for a tight, gap-free fit. Universal or fabricated alternatives often require shimming or extra sealant and can leave gaps that compromise draft and venting safety.
Installation involves removing the existing transition, fitting the OEM part, and sealing/fastening the flue connection — roughly 20–40 minutes. Allow the furnace to cool and shut off power before servicing. Because this is a combustion-venting component, confirm proper draft and check for flue gas leaks; have a licensed technician verify if you are unsure.