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The Goodman 0128F00006 chimney transition bottom is the sheet-metal flue-connector piece that channels combustion exhaust from the AMH81405DXCF furnace's inducer/collector outlet into the vent pipe. A correctly fitted transition ensures a proper draft, prevents flue-gas leakage, and maintains the sealed pathway your furnace's venting design depends on.
Flue transitions are dimensionally specific — the OEM 0128F00006 matches the exact flange pattern, offset, and diameter of your furnace cabinet. A generic or hand-fabricated piece risks gaps that leak carbon monoxide. For any combustion-venting component, use the genuine Goodman part.
Moderate (3/5). Requires removing the existing transition, resealing joints with high-temp foil tape or approved sealant, and verifying draft. Because this handles combustion gases, we recommend installation by a qualified HVAC technician and a post-repair CO check.