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The Goodman 22309501 Flue Pipe is a genuine OEM exhaust venting component for the GKS90904CXAG gas furnace. It connects the heat exchanger and inducer blower to the venting system, carrying combustion byproducts safely out of the appliance. A degraded, cracked, or misaligned flue pipe can allow flue gas leakage and disrupt the negative pressure the pressure switch depends on — making this a critical safety component.
This genuine Goodman OEM flue pipe is molded to the exact diameter, bend geometry, and gasket profile of your furnace. Generic vent tubing rarely matches the factory routing and can create leak points or improper draft. The OEM part restores the manufacturer-engineered venting path and maintains warranty compliance.
Moderate (2/5). Expect 20–30 minutes. Shut off gas and power, remove the furnace access panels, detach the old flue pipe from the inducer and heat exchanger collars, transfer or replace gaskets, and secure the new pipe. Because this handles combustion gases, we strongly recommend a licensed HVAC technician verify draft and check for leaks before returning the furnace to service.