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The Goodman 0128F00006 chimney transition bottom is a factory-original sheet-metal venting component designed for the AMH80804BXBD 80% AFUE gas furnace. It forms the lower connection between the furnace flue collector and the vent/chimney pipe, ensuring combustion byproducts are routed safely and with the correct draft geometry. A properly fitted transition is essential for reliable venting and safe furnace operation.
This genuine OEM transition is stamped to the exact dimensions and hole pattern of your furnace's vent outlet. A generic or hand-fabricated substitute risks air leaks, poor draft, and combustion-gas spillage. The factory part drops in cleanly and keeps your venting system to spec.
Rating: Easy (1.5/5). Most replacements take 10–20 minutes. Shut off the furnace, remove the sheet-metal screws securing the old transition, seat the new panel, and refasten. Verify a tight, sealed connection and confirm proper draft after reassembly. Because this involves flue gases, have a professional confirm venting integrity if you are unsure.