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The genuine Goodman 0128F00006 chimney transition bottom is the flue-vent component that channels combustion gases from the furnace collar into the vent connector on the AMH80403ANBB. A properly fitted transition maintains the correct draft and gas-tight seal so flue products vent safely up the chimney rather than spilling into the equipment room. Rusted, warped, or ill-fitting transitions leak flue gas and can trip pressure or rollout safeties.
The OEM 0128F00006 is stamped to the exact flue-collar dimensions of this furnace, so it seats flush and seals cleanly with minimal fabrication. Generic or hand-cut transitions often leave gaps that leak flue gas or disturb draft — a combustion-safety concern. For any venting component, matching OEM geometry is the safe choice.
Easy — 20–30 minutes. Shut down the furnace, remove the existing transition, fit the replacement to the flue collar, fasten, and seal with approved high-temp material. Verify proper draft and check for spillage on restart.
Confirm the AMH80403ANBB model and your venting layout before ordering.