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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM venting component for the Goodman/Amana ADSH800403AXAB gas furnace and compatible 80% AFUE models. This transition piece adapts the furnace's draft-hood/vent outlet to the chimney connector, providing a properly sized, sealed pathway for flue gases to exit the heat exchanger and induced-draft system. A correctly fitted transition is essential for safe venting and proper draft.
This transition is stamped to the exact dimensions of the furnace's vent collar, ensuring a tight, code-compliant connection with no gaps that could leak combustion byproducts. Field-fabricated or generic adapters often fit loosely and can compromise draft. For a flue-gas component, the genuine Goodman part is the safest choice.
With power and gas off, remove the existing vent connection, fit the 0128F00006 transition to the furnace outlet, fasten with sheet-metal screws, and seal joints with high-temp foil tape or approved sealant per local code. Reconnect the chimney connector and confirm there are no gaps. Because this involves combustion venting, a draft and spillage check by a qualified technician is recommended after installation.