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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue and venting component engineered for the Goodman WFM18090S5CXCB gas furnace. This transition piece seats at the base of the venting connection and channels combustion byproducts from the heat exchanger toward the flue, maintaining the proper draft path and a safe, sealed exhaust route out of the appliance.
This is a factory OEM Goodman part, guaranteeing an exact dimensional match to the original venting geometry. Generic aftermarket transitions can vary in flange size and hole placement, which risks flue gas leaks and improper draft. Choosing OEM ensures a clean seal and full compatibility with your furnace's certified venting system.
Rating: Moderate. Access requires removing the furnace vent connection and any securing screws. Always shut off gas and power, verify vent alignment, and reseal per manufacturer guidance. If you are not comfortable working with combustion venting, we recommend a licensed HVAC technician to preserve safe operation.