Goodman Furnace: Elbow dimensions for vent piping
Elbow dimensions for vent piping on a Goodman furnace: For the Goodman vent and intake piping, use medium-radius (1/4 bend DWV) or long-sweep elbows that meet ASTM D3311. A tight elbow adds more resistance than the vent length calculation assumes. If you are not sure what you have in your hand, just measure it, center to face, and compare to the sizes below.
Applies to: Vent and intake elbows
Common causes of elbow dimensions for vent piping
- Short-radius elbow used where a medium-radius or long-sweep is required
- Elbow not meeting ASTM D3311
- Elbow resistance underestimated in the vent length calculation
How to fix elbow dimensions for vent piping: step by step
- For 2 in. pipe, a medium-radius elbow measures at least 3 1/16 in. from the plane of one opening to the center line of the other.
- For 3 in. pipe, a medium-radius elbow measures at least 4 9/16 in.
- Measure each elbow before gluing.
- Set aside any elbow that comes up short.
If the unit shows an error code, look it up: Goodman Furnace codes
Source: Goodman GMVC96 service and troubleshooting manual, p. 12. 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.