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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/vent component engineered for the Goodman/Amana AMS80603AXAD gas furnace. This transition piece seats at the base of the vent connection, directing combustion byproducts into the flue and maintaining the proper draft path required for safe, code-compliant venting.
The genuine OEM part matches the original stamping, bend geometry, and mounting hole pattern exactly, so it drops in without modification and preserves the manufacturer-engineered draft. Generic alternatives for transition components are rare and frequently require field trimming, which can compromise the vent seal. For flue-side parts we recommend OEM to keep the venting system within spec.
Moderate. Replacement requires disconnecting the vent connector, removing fasteners, and reseating the new transition with proper alignment. Combustion venting work should be verified with a draft test. Budget 30–45 minutes; a qualified HVAC technician is recommended.