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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component designed for the Goodman VMS80604BNAA gas furnace. This transition piece connects the furnace's induced-draft flue outlet to the vent pipe or chimney, forming a sealed, properly sized pathway that carries combustion byproducts safely out of the home. A cracked, corroded, or ill-fitting transition can leak flue gases, disrupt draft, and trigger pressure-switch faults or ignition lockouts.
This genuine Goodman OEM transition matches the factory flue geometry and gasket seat for an airtight fit. Generic sheet-metal substitutes often need shimming or sealing and can restrict draft, leading to nuisance pressure-switch trips. For proper venting, OEM is the safe choice.
Requires shutting off power, disconnecting the vent pipe, and replacing the transition with correct gasket/sealant per the installation manual. Because this handles combustion exhaust, verify a leak-free seal and proper draft after installation — a carbon monoxide check is recommended. HVAC professional installation is advised.