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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM venting component for Goodman ACVC800805CXAA gas furnaces. This sheet-metal transition piece connects the furnace's induced-draft outlet to the vent / chimney connector, channeling combustion byproducts safely out of the home. A corroded or warped transition can leak flue gases or disrupt draft — replacing it with the factory part maintains a proper, sealed vent path.
This genuine OEM Goodman transition is stamped to match the exact bolt pattern and outlet dimensions of your furnace cabinet. Generic or fabricated transitions rarely seal correctly, risking flue-gas leakage and draft problems. For a venting component, OEM fit is strongly recommended.
Easy to Moderate. Power down the furnace, detach the vent connector, remove the mounting screws, and swap in the new transition with fresh high-temp sealant where required. Confirm proper draft and check for spillage at the draft hood after restart.