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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component engineered for the ADSS800403AXAA gas furnace. This transition piece forms the sealed connection between the furnace vent collar and the venting system, ensuring proper draft and safe combustion-byproduct removal. A correctly fitted transition bottom prevents flue-gas leakage and maintains the venting geometry the furnace was certified with.
OEM vs. Generic: This is the factory Goodman part, dimensioned to match the original vent collar and gasket seat exactly. Generic or fabricated substitutes risk misalignment, air gaps, and failed combustion-analysis inspections. For a listed appliance, using the OEM transition keeps the venting within manufacturer specification.
Install Difficulty: Easy (1/3). Requires basic hand tools and sheet-metal screws; disconnect power and shut off gas before servicing. If you are not comfortable verifying draft after reassembly, have a licensed HVAC technician confirm proper venting.