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The Goodman 0128F00006 Chimney Transition Bottom is the OEM flue-vent transition component for the VMES800804BXAA gas furnace. This formed sheet-metal piece adapts the furnace's induced-draft blower outlet to the vent connector, maintaining the proper flue path and combustion-gas seal. Using the correct transition ensures safe draft, prevents flue-gas leakage, and keeps venting aligned to manufacturer specification.
OEM vs. Generic: Venting components must match the furnace's exact outlet dimensions and clearances. The genuine Goodman 0128F00006 is stamped to factory tolerances so it seats correctly and seals against combustion-gas escape. Universal or fabricated substitutes risk gaps that can leak flue gases — this is a safety-critical part where OEM is strongly advised.
Install difficulty: Easy (2 of 5). Secured with sheet-metal screws; seal seams per code. Shut off power and gas, and verify draft after reassembly.