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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue-vent component engineered for the Goodman/Amana DMP125-52AB furnace. This transition piece adapts the furnace flue collar to the chimney or vent connector, maintaining proper draft and a sealed combustion-gas path from the heat exchanger to the vent system. Using the exact factory part protects the integrity of your venting and keeps the appliance operating to spec.
OEM vs. Generic: The genuine OEM 0128F00006 is stamped to exact factory dimensions so it seats flush against the flue collar with no gaps that could leak combustion byproducts. Aftermarket transitions often require trimming or extra sealant and may not match the original gauge. For a venting component, exact fit is a safety matter — we recommend OEM.
Install difficulty: ⭐⭐ Easy–Moderate. Requires basic sheet-metal tools, high-temp sealant, and vent screws. Always shut off gas and power before servicing and verify proper draft on restart. Professional installation recommended if you are not experienced with flue venting.