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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component for ADSS800603AXAB gas furnaces. This transition piece connects the furnace's induced-draft or flue outlet to the venting system, channeling combustion byproducts safely out of the home. A corroded, cracked, or ill-fitting transition can leak flue gases, disrupt draft, and trigger pressure-switch faults — replacing it restores a properly sealed, code-compliant venting path.
Our OEM Goodman transition is stamped to the exact dimensions and flange pattern of the original, so it seats cleanly against the furnace and mating vent sections without gaps. Generic or fabricated pieces frequently misalign, requiring extra sealant and risking flue-gas leaks. For venting integrity, OEM fit matters.
Difficulty: Moderate. Turn off power and gas, disconnect the vent connector, remove the old transition, and install the new one with proper high-temperature sealant and fasteners. Typically 30–45 minutes. Because improper venting can allow carbon monoxide into the home, a licensed HVAC technician should perform the work and verify draft.
Backed by OEM quality and an exact-fit guarantee for your Goodman furnace.