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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM venting component for the ADSH800804BXAC gas furnace. This transition piece channels flue gases from the heat exchanger collector to the vent connector, forming a sealed pathway that maintains proper draft and keeps combustion byproducts out of the living space. A properly fitted transition is essential to safe venting and correct pressure-switch operation.
OEM vs. Generic: The OEM 0128F00006 is stamped to the exact dimensions and mounting-hole pattern of this furnace, so it seals cleanly and aligns with the pressure-switch tubing and vent connector. Generic or fabricated transitions often require trimming and extra sealing, and a poor fit can cause draft problems or flue-gas leakage. For a venting part, exact fit is a safety priority.
Install difficulty: Moderate (2/5). Shut off gas and power, disconnect the vent connector, and remove the fasteners securing the transition. Install the replacement with high-temperature sealant where specified and confirm all joints are tight. After service, verify proper draft and check for spillage at the draft hood with the furnace running.