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The Goodman 22309501 Flue Vent Pipe is a genuine OEM replacement for the GKS90704CXAD gas furnace. The flue pipe carries combustion exhaust gases from the inducer assembly out of the furnace, and a corroded, cracked, or improperly sealed flue is a serious safety concern that can allow flue-gas leakage and pressure-switch faults.
The OEM Goodman flue pipe is molded to the exact length, diameter, and connection profile required by the GKS90704CXAD venting layout. Generic substitutes risk poor gasket seals and improper draft. For a safety-critical exhaust component, OEM is strongly recommended.
Moderate (3/5). Turn off gas and power, remove the venting fasteners and gaskets, swap the flue pipe, and reseal all joints. A 30–45 minute job requiring hand tools and careful gasket inspection. Because this handles combustion gases, verify a leak-tight seal and correct draft — have an HVAC professional inspect if unsure.