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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component for the WGFM28070V4BXAB gas furnace and compatible Goodman/Amana models. This transition piece connects the furnace's flue collar to the vent pipe, directing combustion byproducts safely out of the home. A properly fitted transition maintains correct draft, prevents flue-gas leakage, and ensures the pressure switch and inducer see the venting resistance they were designed for.
OEM vs. Generic: The genuine Goodman transition is stamped to the exact flange dimensions and collar diameter of your furnace, ensuring a leak-free, gap-free fit. Generic or fabricated substitutes risk misalignment and flue-gas spillage. For combustion-venting hardware, OEM fitment is important for safety.
Install difficulty: Moderate — requires disconnecting the existing vent connection, seating the new transition, and resealing joints per code. Verify proper draft and check for spillage after installation. When in doubt, use a licensed technician.