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This genuine OEM Goodman 0128F00006 Chimney Transition Bottom is the flue-vent adapter that connects the Goodman VMS80805CNAA furnace's induced-draft outlet to the vent/chimney pipe. It provides the correct geometry and sealing surface for combustion gases to exit the appliance safely, maintaining proper draft and preventing flue-gas leakage into the equipment cabinet.
Venting components must match the furnace's outlet dimensions exactly to preserve draft and seal integrity. The OEM 0128F00006 is stamped to Goodman's factory footprint. Universal transitions often require field modification and can compromise the flue seal, so OEM is strongly preferred for combustion-venting parts.
Moderate (3/5). Involves removing existing vent connections and sealing the new transition. Cut power, allow the flue to cool, and verify proper draft after installation. Improper venting is a carbon-monoxide risk — technician installation recommended.