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The Goodman 0128F00006 chimney transition bottom is the factory flue-vent adapter for the AMH80403AXAA gas furnace and compatible Goodman/Amana models. It forms the sealed transition between the furnace's induced-draft outlet and the vent connector, directing combustion byproducts safely into the chimney. A cracked, rusted, or ill-fitting transition can leak flue gas — installing the correct OEM piece keeps venting sealed and code-compliant.
The OEM 0128F00006 matches the furnace's exact vent geometry and mounting points for a leak-free seal. Generic transitions rarely align with Goodman's cabinet cutout and can compromise draft or create dangerous flue-gas leaks. This is a safety component — genuine OEM is strongly recommended.
Moderate (20–40 min). Requires disconnecting the vent connector, removing fasteners, and re-sealing with high-temp sealant. Best handled by an HVAC professional who can verify draft after reassembly.
Fits: AMH80403AXAA. Confirm your model number on the rating plate before ordering.