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The Goodman 0128F00006 is a genuine chimney transition bottom for AMVC800804CXAB gas furnaces. This flue/vent component bridges the furnace's induced-draft outlet to the vent connector, channeling combustion byproducts into the chimney or vent system. Correct transition geometry is critical for proper draft, safe flue-gas evacuation, and reliable pressure-switch operation.
Aftermarket transitions rarely match the exact flange dimensions and outlet size, which can create leaks, poor draft, or pressure-switch faults that lock out the furnace. The OEM Goodman 0128F00006 seals precisely to the furnace and vent connector, maintaining safe flue-gas flow and correct negative pressure in the vent system.
Moderate (3/5). Roughly 30–40 minutes; involves separating the vent connection, fitting the transition, and re-sealing joints with approved fasteners and sealant. Shut off power and gas first, and always confirm proper draft and check for flue-gas leakage after installation. Venting work is best verified by a qualified technician.