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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue-venting component engineered as an exact-fit replacement for the AMH81205DNBA gas furnace and compatible Goodman/Amana models. It forms the lower transition between the heat exchanger vent outlet and the chimney/vent connector, maintaining proper draft and a sealed flue path for safe combustion-gas evacuation.
A cracked, corroded, or missing transition can cause flue-gas spillage, nuisance limit trips, and failed combustion. Replacing it with the factory part restores the original venting geometry and seal.
OEM vs. Generic: The genuine Goodman transition matches the original stamping, mounting holes, and clearances exactly, so it seals without modification. Aftermarket transitions often require trimming or re-drilling and can leave gaps that leak flue gas. For a combustion-venting part, exact fit is a safety issue — we recommend OEM.
Install difficulty: Moderate. Requires shutting off gas and power, removing the vent connector and existing transition, and re-sealing. Best performed by an HVAC technician; verify draft and check for spillage after reassembly.