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Possible Vertical
vent length
Let's imagine an installation consisting of a 4-feet vertical rise, a 90-degree elbow, followed by a 7-feet horizontal run
through the wall, ending with a termination cap. This type installation is not acceptable. As you can see, the vent
termination is clearly outside the allowed configuration zone on the chart. The venting system does not have at least
one foot of vertical rise for each foot of horizontal run. Furthermore, it does not have a minimum elevation of 3 feet
on the outside wall.
Instead, if this installation consisted of a 4-feet vertical rise, a 90-degree elbow, followed by a 7-feet horizontal run
through the wall, a clean our Tee, and a 3-feet rise ending with a termination cap, it would be acceptable. The
installation would end be within the allowable configuration zone on the chart since it would have at least one foot of
vertical rise for each foot of horizontal run. Furthermore, the outside wall vent would have a minimum rise of 3 feet.
APPENDIX A
HORIZONTAL AND VERTICAL VENT CHART
If you plot your venting
system configuration on
this chart, your wall or
roof termination should
be within the grid.
17
Possible Horizontal
vent length (feet)
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