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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM venting component engineered for the ADVC80703BXAA 80% AFUE gas furnace and other compatible Goodman/Amana models. This transition piece seats at the base of the flue collector and directs combustion byproducts into the vent connector, maintaining proper draft and a sealed exhaust path. A correctly fitted transition is essential to safe venting — a poor seal can allow flue gas leakage and nuisance limit trips.
This is the factory OEM part, dimensionally matched to the original flue geometry for a leak-free seal. Universal or generic transitions often require field modification and may not align with the collector box, risking improper draft. For a venting component, exact OEM fit is strongly recommended.
Moderate. Requires furnace shutdown, partial vent disassembly, and re-sealing of connections. Recommended for HVAC technicians or experienced DIYers. Always verify draft and perform a combustion/CO check after installation.