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The Goodman 0128F00006 Chimney Transition Bottom is a genuine OEM flue-vent adapter that couples the furnace vent outlet to the chimney or vent connector on the WFD18090S4BXCC. This transition piece guides combustion byproducts out of the heat exchanger and maintains the draft path. A rusted, warped, or ill-fitting transition leaks flue gases and can spill carbon monoxide into the equipment room, so a clean OEM seal matters.
The genuine Goodman OEM 0128F00006 matches the exact vent collar dimensions and mounting pattern of this furnace. Universal transitions rarely align perfectly, forcing field modifications that compromise the flue seal. For venting and combustion-safety hardware, OEM fit protects against dangerous flue-gas spillage.
Moderate (2/5). Power down, disconnect the vent connector, remove the old transition's fasteners, seat the new piece, and re-secure with the correct screws and high-temp sealant where specified. Twenty to thirty minutes. Always verify proper draft and test for CO after any venting work.
Confirm your model before ordering. Email info@nationalhvacparts.com with questions.