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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM venting component for Goodman ACEC800603BXAB gas furnaces. This transition piece connects the furnace flue collar to the chimney or vent run, channeling combustion byproducts safely out of the home. A properly fitted transition maintains correct draft and prevents flue-gas leakage, which is critical for safe furnace operation.
The OEM 0128F00006 is stamped to fit the furnace's exact flue geometry, ensuring a leak-free seal. Universal or shop-fabricated transitions risk gaps that allow flue-gas spillage. For a combustion-venting part, OEM fit and material gauge matter.
Moderate — requires sheet-metal tools, fasteners, and proper sealing. A draft and spillage test should follow installation. Recommended for an HVAC professional.