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The Goodman/Amana 0128F00006 Chimney Transition Bottom is the OEM flue/vent transition piece for the AMH81005CNBA 80% AFUE gas furnace. This sheet-metal component connects the furnace's induced-draft outlet to the vent connector, forming the sealed transition that carries combustion byproducts safely into the chimney or vent pipe. A corroded, cracked, or missing transition can leak flue gases and disrupt proper draft — a combustion-safety issue that should be corrected with the correct factory part.
OEM vs. Generic: This transition is stamped to the exact dimensions of the AMH81005CNBA cabinet and draft assembly. Generic or fabricated substitutes rarely match the flange pattern and can leave gaps that compromise the vent seal. Because this part is on the flue-gas path, the OEM piece is the correct choice.
Install difficulty: Easy (2/5). Removes and reinstalls with a few sheet-metal screws; plan on 15–30 minutes. Turn off power and gas, let the furnace cool, and re-seal all vent joints per code after installation. If you smell combustion gases or suspect a venting problem, have a licensed technician inspect the system.