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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component for AMS80603AXAA gas furnaces. This sheet-metal transition adapts the furnace's induced-draft outlet to the vent connector, forming the bottom of the chimney transition assembly that routes combustion gases safely to the flue. A rusted, warped, or missing transition can allow flue-gas leakage, so replacing it with the factory part maintains a proper, sealed venting path.
This genuine Goodman OEM transition is stamped to the furnace's exact flue geometry and mounting-hole pattern, so it seats and seals correctly the first time. Generic sheet-metal substitutes rarely match the factory bend and hole layout, leading to gaps and leaks in a combustion-venting path. OEM is the right choice for any flue component.
Easy (1/5). Fastens with sheet-metal screws and factory gasketing. Shut off power and gas, and verify the vent connection is sealed and leak-free after install. When in doubt, use a licensed HVAC technician.