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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component engineered for the ACES800805CXAA gas furnace and compatible Goodman/Amana models. This transition piece seats at the base of the vent collector to channel combustion byproducts cleanly into the flue, maintaining proper draft and a sealed exhaust path. A correctly fitted transition is critical for safe venting and consistent furnace operation.
Unlike universal aftermarket vent pieces, this genuine OEM Goodman transition matches the original collector box geometry exactly — no trimming, gapping, or improvised sealing. Generic substitutes often leak at the seam or restrict draft, which can trigger pressure-switch faults or unsafe spillage. The OEM part restores factory venting performance and protects your furnace warranty.
Difficulty: Moderate. Replacement requires removing the furnace front panels, disconnecting the existing transition, and resealing the new piece with high-temp furnace sealant or factory gaskets. Allow 30–45 minutes. Always shut off gas and power before servicing, and verify proper draft after install. If you are unsure about combustion venting, consult a licensed HVAC technician.