7
VENTING OPTION #3
Use this chart to calculate the vertical rise when using a total of 2 horizontal runs. When the vertical rise is at its minimum of 1 foot, the first horizontal run can be a maximum of 2 feet and 1 foot maximum for the second run. When the vertical rise is at its maximum of 20 feet, the first horizontal run can be a maximum of 8 feet and 10 feet maximum for the second run.
| 10 FT MAX |
| (1 FT MAX) |
| FIGURES 7 |
| 20 FT MAX |
VERTICAL | 1 FT MIN |
RISE in feet |
|
| 8 FT MAX |
| (2 FT MAX) |
COMBINED HORIZON-
TAL VENT RUN in feet
VENTING OPTION #4
Use this chart to calculate the total vertical rise required when the horizontal run is between 18 feet maximum or 3 feet maximum length when the initial vertical rise is at its minimum of 1 foot.
34 FT MAX (1 FT MAX)
COMBINED | FIGURES 8 | 18 FT MAX |
VERTICAL |
| (3 FT MAX) |
RISE in feet |
| |
|
|
6 FT MAX
1 FT MIN
HORIZONTAL VENT RUN
in feet
