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The Goodman 22309501 Flue Vent Pipe is a genuine OEM exhaust component designed for the GKS90905DXAD high-efficiency gas furnace and related GKS90 series units. It carries combustion byproducts from the secondary heat exchanger to the venting system, and its exact geometry is critical to maintaining proper draft and passing the pressure-switch safety checks that allow the furnace to fire.
This genuine OEM flue pipe is pre-formed to match the factory venting layout, ensuring correct bends, length, and connection diameters. Generic pipe sections may not align with the inducer outlet or vent transition, leading to leaks of hazardous combustion gases or incorrect pressure readings. On a condensing furnace, an exact vent fit is a safety-critical requirement — not a place to improvise.
Moderate (3/5). Replacement involves shutting off gas and power, disconnecting the existing vent section, sealing all joints correctly, and verifying draft. Because this component handles combustion gases, we strongly recommend installation by a licensed HVAC professional who can confirm proper venting and safe operation.