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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM venting component that adapts the furnace flue outlet to the chimney/vent connector on the Goodman/Amana AMS81405DNBB 80% gas furnace. This factory-stamped transition seats the induced-draft flue collar to the correct diameter and angle, ensuring proper draft, a tight vent seal, and safe combustion-byproduct removal.
The genuine OEM 0128F00006 matches the factory flange pattern and outlet diameter exactly, so the vent seals without gaps or field fabrication. Generic sheet-metal transitions rarely align with the induced-draft housing and can leak flue gases — a carbon-monoxide safety hazard. For any venting component, OEM fit is strongly recommended.
Replacement involves removing the vent connector, unfastening the old transition screws, and fitting the new piece with high-temp sealant and sheet-metal screws. No specialty tools are needed, but a combustion/draft check is advised after install. Because this part handles flue gases, verify all joints are sealed and draft is proven. When in doubt, use a licensed HVAC technician.