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The Goodman 0128F00006 is the bottom chimney transition piece used in the venting assembly of ACES800403ANAA gas furnaces. This sheet-metal transition seats between the furnace flue collar and the vent connector, directing combustion byproducts safely into the chimney or vent pipe. A correctly fitted transition maintains proper draft and prevents flue-gas spillage into the living space.
This is a genuine OEM Goodman component engineered to the original flue geometry, so it aligns with factory gasket and clearance specs. Generic or fabricated transitions can leave gaps that disrupt draft and create a carbon-monoxide hazard — for a venting part we strongly recommend OEM.
Moderate. Replacement requires removing the existing vent connector, fitting the new transition, and re-sealing joints with approved high-temp tape or sealant. Always shut off gas and power first, and verify proper draft after reassembly. If you are not comfortable working on flue venting, use a licensed HVAC technician.