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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM venting component for the Amana/Goodman AMH80805CNBC 80% AFUE gas furnace. This sheet-metal transition routes combustion gases from the furnace collector box into the flue/chimney connection, maintaining a sealed, properly sized venting path. A corroded, warped, or missing transition can cause flue-gas leakage, poor draft, and safety-related shutdowns.
This factory OEM transition is stamped to the exact dimensions and mounting-hole pattern of the AMH80805CNBC cabinet. Generic or fabricated substitutes rarely seal correctly and can compromise venting integrity — always a concern with combustion products.
Easy–Moderate (2/5). Shut off gas and power, disconnect the vent, remove the mounting screws, swap the panel, and reseal per code. Budget 20–30 minutes; verify draft after reassembly.