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The Goodman 0128F00006 is a genuine OEM chimney transition bottom used in the flue/venting assembly of the ADSH800403AXAC furnace. This transition piece channels combustion byproducts from the furnace into the vent connector, maintaining proper draft and a sealed flue path. A damaged or corroded transition can allow flue gas leakage and poor venting — replacing it with the factory part protects combustion safety.
Flue transitions must match the furnace's exact venting geometry to seal correctly. This OEM Goodman part fits the factory flue collar and vent connector without modification, unlike universal fabricated pieces that may leave gaps.
Moderate (2 of 3). Involves removing the existing vent connector and fasteners, then sealing the new transition per code. Shut off power and gas, verify proper draft after install, and confirm no flue gas spillage. If in doubt, use a licensed HVAC technician.