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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue-venting component for AMH80604BNBD gas furnaces and compatible Goodman/Amana models. This stamped transition piece connects the furnace's induced-draft outlet to the vent/chimney connector, maintaining proper draft geometry and a sealed path for combustion byproducts. A rusted, warped, or missing transition can cause draft problems and flue-gas leakage, so a correct-fitting OEM replacement is important for safe venting.
This OEM Goodman transition is stamped to the exact dimensions and mounting-hole pattern of your furnace's vent outlet. Generic or fabricated substitutes rarely match the flange geometry, risking gaps, leaks, and poor draft. For a flue-gas component, OEM fit is the safe, code-friendly choice.
Moderate (2/5). Turn off power, disconnect the vent connector, remove the fasteners securing the transition, and install the replacement with fresh high-temp sealant/gasket where required. Typically 20–30 minutes. After install, verify a tight seal and confirm proper draft during a heating cycle.