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The Goodman 0128F00006 is a genuine OEM chimney transition bottom (flue vent connector) built for the GDH80403ANAA gas furnace. This sheet-metal component channels hot combustion gases from the heat exchanger collector box up into the vent pipe / chimney. A correctly-fitted transition maintains proper draft and keeps flue products safely contained, protecting your home from spillage and corrosion.
The genuine OEM 0128F00006 is stamped to the exact dimensions of your furnace's collector box and vent opening, ensuring a leak-free, gapless fit. Universal or fabricated substitutes rarely align correctly and can leave gaps that allow flue-gas spillage. For a venting component, OEM fit is essential.
Moderate (2/5). Requires removing the existing transition, cleaning mating surfaces, and re-sealing with high-temp furnace cement or foil tape as specified. Verify draft and check for spillage with a CO meter after reassembly. When in doubt, consult a qualified technician.