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The Goodman 0128F00006 chimney transition bottom is a flue/vent component for the WFM18090S4BXCC furnace and compatible Goodman/Amana models. This sheet-metal transition forms the lower section that channels combustion byproducts from the furnace collar into the vent/chimney connector, maintaining a proper sealed draft path. A corroded, warped, or missing transition can allow flue-gas leakage and compromise venting safety.
This genuine Goodman OEM transition is stamped to the furnace's exact flange geometry, so it seats and seals without field modification. Generic or fabricated substitutes often need cutting and extra sealing, increasing the risk of flue-gas leaks. For a venting component, precise OEM fit is a safety consideration.
Moderate (3/5). Shut down the furnace, disconnect the vent connector, remove fasteners, and replace the transition — then reseal all joints with approved high-temp sealant or foil tape and confirm proper draft. Budget 30–45 minutes. Because this affects combustion venting, have a licensed technician verify draft and check for spillage after installation.