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The Goodman 0128F00006 is a genuine OEM chimney transition bottom — the sheet-metal flue adapter that couples the furnace draft hood or induced-draft outlet to the vent connector on the WFD18115S5CXCC and compatible Goodman/Amana furnaces. Its factory geometry preserves the correct flue cross-section so combustion byproducts vent reliably and draft pressure stays within spec.
Flue components are safety hardware. The OEM Goodman transition drops into the exact opening and maintains the engineered vent path; a fabricated or generic substitute can leak, restrict draft, or fail to seal — risking flue-gas spillage. For anything carrying combustion products, use the factory part.
Moderate (2/5) — Requires removing the existing flue section, positioning the transition, and resealing joints per code with approved materials. Confirm proper draft after reassembly. This is a job for a licensed HVAC technician; verify no flue-gas spillage at the draft hood before returning the unit to service.