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The Goodman 0128F00006 Chimney Transition Bottom is the OEM flue-vent transition that adapts the flue collector outlet to the vent connector on VCES800603AXAA 80% gas furnaces. This sheet-metal transition seals the combustion-byproduct path between the furnace and the chimney/vent run, and a cracked, corroded, or missing transition is a common cause of vent leaks and failed combustion-air draw.
The genuine OEM 0128F00006 is stamped to the factory flue geometry, so it mates precisely to the collector box and vent connector with the correct clearances. Generic universal transitions often require field cutting and extra sealant, and a poor seal on a flue component risks flue-gas spillage. For a safety-critical vent path, OEM fit is strongly recommended.
Moderate — sheet-metal work with screws and high-temp sealant. Requires shutting off gas and power, and a combustion/draft check after reassembly. Best performed by an HVAC technician.
Always de-energize the furnace and shut off the gas supply before servicing. Verify proper draft after installation.