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The Goodman 0128F00006 is a genuine OEM chimney transition (bottom) that channels combustion byproducts from the induced-draft blower into the vent system on the AMH80805CXBA and related Goodman/Amana 80% AFUE furnaces. This sheet-metal transition piece maintains the correct flue geometry and draft path so the furnace vents safely and passes its pressure-switch proving cycle. A cracked, corroded, or missing transition can cause draft faults, pressure-switch lockouts, or flue-gas spillage.
Venting components are dimension-critical. This factory OEM Goodman transition matches the exact flange pattern, gasket surface, and clearances of your furnace cabinet. Universal or fabricated substitutes risk leaks at the seams and improper draft — not worth the safety trade-off on a combustion part.
Moderate (3 of 5). Requires removing the inducer/vent assembly, transferring the gasket, and resealing per Goodman spec. Shut off power and gas, and verify a clean vent draft after reassembly. A licensed HVAC technician is recommended for venting work.