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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component for the AMVC800804CNAB 80% AFUE two-stage gas furnace. This transition piece connects the furnace's induced-draft outlet to the vent chimney, forming a properly sealed, code-compliant path for combustion byproducts. A correctly fitted transition is essential for safe venting and reliable draft on 80% furnaces.
Because the transition must mate precisely to the furnace cabinet and vent collar, an OEM part guarantees the correct bend, flange, and hole pattern. Generic or field-fabricated transitions risk leaks, poor draft, and code violations. This genuine Goodman piece drops in with the original screw locations.
A 10–15 minute job for most technicians. Disconnect the existing transition, remove sheet-metal screws, position the new bottom section, screw it in place, and seal the joints with high-temp foil tape or approved sealant. Always verify proper draft and check for spillage at the draft hood after reassembly. Turn off power and gas before servicing.