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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue-vent component engineered specifically for the WFM18140S5DNCC gas furnace. This transition piece seals the bottom junction of the flue collector to the vent connector, directing combustion byproducts safely into the chimney or vent pipe. Because it is a factory part, it matches the original flange dimensions and gasket seat exactly — no field modification or sealant workarounds required.
Aftermarket transition adapters often require trimming or extra high-temp sealant to seal against the collector box. This genuine OEM piece drops in with the original bolt pattern and gasket profile, preserving proper draft and passing inspection. For a combustion-vent component, exact fit is a safety matter — we recommend OEM.
Easy — DIY friendly (1/5). Requires basic hand tools to unfasten the old transition and seat the replacement. Always shut off gas and power before servicing, and confirm a proper draft after reassembly. If you are unsure about combustion venting, consult a licensed HVAC technician.