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The Goodman 0128F00006 is the OEM bottom chimney transition that routes flue products from the heat exchanger collector box into the vent connector on your furnace. It is a factory-engineered fit for the Amana / Goodman AMVC80805DNBC 80% AFUE modulating gas furnace, and is designed to maintain proper draft and a leak-free flue seal. Replacing a cracked, corroded, or rusted transition restores safe venting and prevents flue gas spillage into the cabinet.
This is the genuine Goodman OEM part, machined to the exact flange pattern and gasket seat of the original. Generic or universal transitions often require field cutting and rarely seal cleanly, which risks draft problems and failed inspections. The OEM part drops in with no modification.
Moderate. Requires shutting off gas and power, removing the vent connector, and reseating the transition with proper high-temp sealant. Most experienced DIYers complete it in 30–45 minutes; if you are unsure about combustion venting, use a licensed HVAC technician.