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The Goodman 0128F00006 Chimney Transition Bottom is the OEM flue-vent transition piece for the AMEC800803BXAA gas furnace. It forms the sealed connection between the furnace vent outlet and the chimney/vent connector, channeling combustion byproducts safely out of the home and maintaining proper draft. A cracked, corroded, or ill-fitting transition can leak flue gases and disrupt the vent path, so a correct-fit OEM replacement is a safety-critical part.
Because the transition is stamped to match the furnace's exact vent geometry, a universal or hand-fabricated substitute rarely seals cleanly and can create draft or spillage problems. This OEM Goodman transition is a factory-formed drop-in that mates precisely to the cabinet and vent connector, preserving the certified venting design and warranty.
Easy to Moderate (20–30 min). Power down the furnace, disconnect the vent connector, remove fasteners, swap the transition, and reseal joints with approved high-temp material. Verify proper draft and check for spillage at start-up.