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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue/venting component for the Goodman/Amana WFM18070S4BXCC gas furnace. This transition piece connects the furnace's flue collar to the chimney/vent connector, forming the sealed bottom of the venting path that carries combustion byproducts safely out of the equipment. Cracked, rusted, or ill-fitting transitions can leak flue gases and cause improper draft — replacing a corroded piece with the factory part restores a safe, sealed vent.
Venting components must match the furnace's flue outlet dimensions exactly to seal properly. This genuine OEM transition is formed to the correct size and profile for this cabinet, so it seats cleanly against the flue collar. Generic or fabricated substitutes risk gaps and flue-gas leakage — a safety hazard. Fit OEM for venting.
Moderate — Requires disconnecting the vent connector, removing fasteners, and sealing the new transition with approved high-temp sealant or foil tape as specified. Plan on 30–45 minutes. Because it involves flue-gas venting, a CO test and draft check afterward are strongly recommended — if unsure, use a licensed HVAC technician.