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The Goodman 0128F00006 is a genuine OEM chimney transition bottom for the AMVC81005CNBD 80% AFUE two-stage variable-speed furnace and related AMVC8 / GMVC8 models. This sheet-metal transition connects the furnace's induced-draft blower outlet to the vent pipe, channeling flue gases up and out of the home. A correctly fitted transition maintains proper draft, prevents flue-gas leakage, and keeps the pressure switch reading accurately so the furnace fires on schedule.
OEM vs. Generic: This OEM transition is stamped to the exact bolt pattern, angle, and outlet diameter of your furnace cabinet. Field-fabricated or generic transitions rarely seal cleanly, which can allow flue-gas spillage or throw off the pressure-switch signal. For a component that handles combustion byproducts, an exact-fit OEM part protects both safety and reliability.
Install difficulty: Moderate. Shut off power and gas, disconnect the existing vent pipe, remove the mounting screws, and swap the transition, resealing joints with approved high-temperature foil tape or sealant. Plan for 30–45 minutes. Because this affects flue draft and combustion venting, have a licensed HVAC technician verify draft and check for spillage after installation.