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The Goodman 0128F00006 Chimney Transition Bottom is the genuine OEM flue-vent transition piece that channels combustion byproducts from the ACEC801005CXAB furnace's collector/draft hood up into the chimney connector. Its correct geometry maintains proper draft and venting so flue gases exit safely. A rusted, crushed, or ill-fitting transition can restrict draft, spill combustion gases, and trip the rollout or pressure switch.
The OEM 0128F00006 is formed to the exact flange and outlet dimensions of this furnace so it seals and aligns without modification. Generic sheet-metal substitutes rarely match the draft path, risking leaks at the joints. For a venting component, a precise OEM fit is the safe choice.
Moderate (2/5). Power down the furnace, remove the screws securing the old transition, fit the OEM replacement, and reseal all joints. Safety: confirm proper draft and test for flue-gas spillage with a CO meter after installation — vent work should be verified by a qualified technician.