14
3.5VENTING APPLICATION FLOW CHART
TOP EXIT
Horizontal Termination |
|
| Vertical Termination | |||||||
|
|
|
|
|
|
|
|
|
|
|
Vertical rise is equal
to or greater than the horizontal run
Horizontal run +
vertical rise to
maximum of 40 feet
Vertical rise is less than horizontal run
Horizontal run +
vertical rise to
maximum of 24.75
feet
4.2times the
vertical rise equal to or greater than the horizontal run
Vertical rise is equal
to or greater than the horizontal run
Horizontal run +
vertical rise to
maximum of 40 feet
Vertical rise is less than horizontal run
Horizontal run +
vertical rise to
maximum of 40 feet
3 times the vertical
rise equal to or greater than the horizontal run
13.1
3.6DEFINITIONS
For the following symbols used in the venting calculations and examples are:
>- greater than
>- equal to or greater than < - less than
< - equal to or less than
HT - total of both horizontal vent lengths (Hr) and offsets (Ho) in feet HR - combined horizontal vent lengths in feet
HO - offset factor: .03 (total degrees of offset - 90°*) in feet VT - combined vertical vent lengths in feet
14.1
3.7ELBOW VENT LENGTH VALUES
| FEET | INCHES |
1° | 0.03 | 0.5 |
15° | 0.45 | 6.0 |
30° | 0.9 | 11.0 |
45° | 1.35 | 16.0 |
90°* | 2.7 | 32.0 |
* The first 90° offset has a zero value and is shown in the formula as - 90°
15.1
