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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue-vent component engineered for the Goodman VMS80403AXAA gas furnace and compatible VMS80 series models. This transition seats at the base of the vent connector, forming the proper draft path from the furnace heat exchanger to the chimney or vent pipe. A correctly fitted transition is essential for safe combustion venting and reliable draft pressure.
This is a factory Goodman OEM part built to the exact draft geometry and clearances of the VMS80 cabinet. Universal or fabricated substitutes can create draft leaks, spillage, or nuisance limit trips. Choosing OEM guarantees a drop-in fit and preserves the furnace's certified venting.
Easy to Moderate. Replacement is straightforward for an HVAC technician or handy homeowner — typically 15-30 minutes with basic tools. Always shut off gas and power before servicing, and verify draft after installation.