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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component for GDH80403AXBD gas furnaces. This transition piece connects the furnace's flue collector to the vent system, channeling combustion byproducts safely into the chimney or vent pipe. A corroded, warped, or missing transition compromises draft and can allow flue gases to escape — a serious safety concern.
OEM vs. Generic: The transition bottom is dimensioned to mate exactly with the furnace's flue outlet and the factory vent connector. Genuine Goodman parts ensure a tight, leak-free seam and correct draft geometry. Generic or field-fabricated substitutes risk gaps that leak flue gas or disrupt draft. OEM is recommended for any combustion-venting component.
Install difficulty: Moderate. Requires removing the existing vent connection, fitting the transition to the flue outlet, and resealing the joints. Verify proper draft with the furnace running before completing service. If unfamiliar with combustion venting, have a licensed technician perform the work.