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The Goodman 0128F00006 Chimney Transition Bottom is the factory-original flue transition/collar that connects the AMEH800805DXAB furnace's draft hood or vent outlet to the chimney or B-vent. Its stamped geometry ensures proper alignment and draft so combustion byproducts vent safely and completely out of the living space.
Venting components must match the furnace outlet exactly to maintain proper draft and clearance. An OEM transition drops in without field fabrication, while generic sheet-metal substitutes risk poor seals, backdrafting, or code issues. For flue-gas safety, the factory part is strongly recommended.
Easy–Moderate — 2 of 5. Disconnect the vent connector, remove the old transition, and fit the replacement, sealing joints with approved high-temp materials and screws. Confirm a proper draft test after installation. Have a qualified technician verify venting.