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The genuine Goodman 0128F00006 chimney transition bottom is the OEM flue/vent component for the ACVC81005CXBC gas furnace and compatible Goodman/Amana models. This transition piece adapts the furnace's flue collar to the vent connector, channeling combustion byproducts away from the heat exchanger and out to the chimney or vent system. A correctly fitted transition maintains proper draft and prevents dangerous flue-gas spillage.
The OEM transition is formed to match your furnace cabinet's exact flue location and dimensions, ensuring a tight, properly sealed connection. A generic or fabricated piece can leave gaps that disrupt draft and allow exhaust leakage. For a flue component handling combustion gases, OEM fit and fitment integrity matter for safety.
Shut off power and gas and allow the flue to cool. Disconnect the vent connector, remove the old transition, and fit the replacement to the flue collar, securing with sheet-metal screws and sealing per code. After install, verify proper draft and check for spillage at the draft hood with the furnace running. Professional or code-compliant installation is recommended for venting work.