Goodman Furnace: Alternate vent/flue location (upflow or horizontal left)
Alternate vent/flue location (upflow or horizontal left) on a Goodman furnace: The alternate vent exit is the large hole in line with the induced draft blower outlet. It is not available on counterflow models.
Applies to: Upflow and horizontal left installations
Common causes of alternate vent/flue location (upflow or horizontal left)
- Vent pipe condensate entering the draft inducer housing in horizontal left installs
How to fix alternate vent/flue location (upflow or horizontal left): step by step
- Remove the four screws from the vent pipe flange on top of the furnace.
- Remove the internal elbow and vent pipe.
- Cut 2 1/2 in. from the flange.
- Remove the plastic plug in line with the inducer outlet.
- Install the cut flange section and connect it to the inducer with the supplied rubber coupling.
- Reinstall the flange with the screws removed in step 1.
- In horizontal left, provide condensate collection so vent condensate does not enter the inducer housing. If the vent drain elbow is removed, use an RF000142 kit.
- Do not damage internal wiring or components when reinstalling the coupling and screws.
If the unit shows an error code, look it up: Goodman Furnace codes
Source: Goodman GMVC96 service and troubleshooting manual, p. 15. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.