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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue-vent component for WFD18070S3AXCC furnaces. It channels combustion byproducts from the heat-exchanger collector box into the vent connector, maintaining proper draft and safe flue-gas evacuation. A corroded or ill-fitting transition can leak flue gas, cause condensation damage, or disrupt draft.
The genuine Goodman transition matches the exact flange pattern and vent diameter of this furnace so it seals to the collector box without gaps. Generic sheet-metal transitions rarely align and can compromise venting. For a combustion-venting part, the OEM component is the safe choice.
Moderate. Shut off power and gas, remove the vent connector, unfasten the old transition, and install the new one with the original screws and high-temp sealant where specified. Plan 30–45 minutes. Verify proper draft and check for spillage after reassembly. Venting work should be confirmed by a qualified technician.