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The Goodman 0128F00006 chimney transition bottom is a genuine OEM flue component for the VDS80603ANAA gas furnace. This formed sheet-metal transition channels combustion by-products from the heat exchanger collector into the vent connector, maintaining proper draft and containing flue gases. A corroded, warped, or missing transition can leak exhaust into the equipment space and disrupt venting — replacing it with the factory part restores a sealed, code-compliant flue path.
The OEM 0128F00006 is stamped to match the exact bolt pattern, gasket seat, and vent geometry of this furnace. Generic or fabricated transitions rarely seal correctly, inviting flue-gas leakage and draft problems. On a component that handles combustion exhaust, an exact fit is a safety requirement.
Disconnect power and shut off the gas. Remove the vent connector and unfasten the existing transition, noting any gaskets. Fit the new 0128F00006, reseal with high-temperature sealant or the correct gasket, and reconnect the vent. Verify proper draft and check for spillage at the draft hood after startup. Flue work involving combustion gases should be done by a qualified technician.