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The OEM 0128F00006 chimney transition bottom is the sheet-metal flue-vent adapter that channels combustion byproducts from the heat-exchanger collector box into the venting system of your Goodman WFM18140S5DNCB furnace. Its precise dimensions ensure proper draft, a leak-free seal, and correct alignment with the flue pipe or induced-draft assembly — a critical part of safe exhaust routing and reliable pressure-switch operation.
Venting transitions are model-specific stampings — flange bolt patterns, outlet diameter, and depth must match the collector box exactly. The OEM Goodman part guarantees a proper seal and correct draft. Generic or universal transitions frequently require modification and can introduce flue leaks or draft problems that trip the pressure switch. For a venting component, OEM fit is worth it.
Moderate (3/5). Requires removing the existing transition, cleaning the mating surfaces, and re-sealing with high-temp silicone or gasket as originally applied. Verify a tight, leak-free seal and confirm the draft/pressure switch operates correctly on startup. Plan 30–45 minutes.
Improper venting can cause carbon monoxide hazards — if you are unsure, have a licensed HVAC technician perform this repair. Questions: info@nationalhvacparts.com.