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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM venting component for the WFM18090S5CXCC gas furnace and related Goodman/Amana models. This transition piece connects the furnace's flue collar to the vent/chimney system, channeling combustion byproducts safely out of the appliance. A correctly fitted transition maintains proper draft and a leak-free seal, which is critical for keeping flue gases from spilling into the living space.
Flue transitions are sized to the specific flue collar diameter and cabinet geometry of the furnace. This OEM 0128F00006 drops in with the correct dimensions and mounting holes for a proper seal and draft. Generic or field-fabricated transitions risk gaps, misalignment, and draft problems. For a venting part, OEM fit is the safest option.
Moderate. Requires shutting off the furnace, disconnecting the existing vent connector, removing the old transition, and sealing the new one with appropriate high-temp fasteners/sealant. About 30–45 minutes. Because it involves flue venting, verify proper draft and check for spillage after install — when in doubt, use a licensed technician.
Always confirm safe venting and CO levels after any flue work.