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The Goodman 0128F00006 chimney transition bottom is a genuine OEM venting component for the Goodman/Amana VDS80804BXAA gas furnace. This sheet-metal transition channels combustion byproducts from the heat exchanger collector box up into the flue/vent connector, maintaining proper draft and a sealed exhaust path. A rusted, warped, or missing transition can allow flue-gas leakage and poor venting — replacing it with the factory part keeps your furnace venting safely and to code.
Because this is a formed sheet-metal part with model-specific dimensions and mounting holes, aftermarket substitutes rarely line up correctly, leading to gaps and air leaks. The genuine OEM Goodman transition is stamped to the original tooling for a drop-in fit and a proper gasket seal.
Moderate. Requires removing the vent connector and existing transition, then re-sealing the new part with high-temp silicone or the appropriate gasket. Budget 30–45 minutes. Proper flue sealing is safety-critical — if you are unsure about draft testing or CO safety, hire a licensed HVAC professional.