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The Goodman 22309501 flue pipe is the OEM internal venting component that carries combustion byproducts from the heat exchanger through the furnace to the vent outlet on the GKS91155DXAG gas furnace. Because it handles hot, corrosive flue gases, this pipe is built to precise material and dimensional specs. A corroded, cracked, or ill-fitting flue pipe is a safety concern that can allow flue-gas leakage — always replace with the correct factory part.
The OEM Goodman flue pipe matches the exact diameter, length, and gasket seating of your furnace's venting system, ensuring a gas-tight seal. Generic or fabricated substitutes risk improper sealing and are strongly discouraged for a combustion-venting component. OEM is the correct and safe replacement.
Moderate (2/5). Requires removing furnace panels, disconnecting the vent connection, and reseating gaskets correctly. If you are not comfortable working with combustion venting, have a licensed HVAC technician perform this replacement. Always shut off power and gas first.