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This genuine OEM Goodman 22309501 flue vent pipe is the factory internal exhaust conduit for the GMH950904CXAA 96% AFUE two-stage gas furnace. It carries combustion byproducts from the collector box/inducer assembly to the PVC vent transition. Because a 96% condensing furnace runs cool, wet flue gas, the internal flue pipe is engineered to resist corrosion and hold a precise geometry for proper draft. A cracked, corroded, or misfit flue pipe can cause pressure-switch faults, poor venting, and a safety lockout — so an exact OEM replacement matters.
OEM vs. Generic: There is effectively no safe generic substitute for a combustion flue component. Diameter, length, and gasket seating are matched to the inducer and collector box — using the OEM 22309501 preserves proper draft, sealing, and combustion safety. This is a code- and safety-sensitive part where OEM is strongly recommended.
Install Difficulty: Moderate (3/5). Requires shutting off gas and power, removing panels, and disconnecting the flue at gasketed joints. Verify all seals and run a combustion check afterward. Best handled by a qualified HVAC technician.