W415-1326 / 05.23.14
13
EN
3.5 DEFINITIONS
14.2
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
H
T
- total of both horizontal vent lengths (Hr) and offsets (Ho) in feet
H
R
- combined horizontal vent lengths in feet
H
O
- offset factor: .03 (total degrees of offset - 135°*) in feet
V
T
- combined vertical vent lengths in feet
3.6 ELBOW VENT LENGTH VALUES
15.2A
FEET
INCHES
MILLIMETERS
1° 0.03
0.5 12.7
15° 0.45
6.0
152.4
30° 0.9
11.0
279.4
45°* 1.35
16.0
406.4
90°*
2.7
32.0
812.8
* The
fi
rst 45° and 90°offset has a zero value and is shown in the formula as -45° and - 90° respectively or
-135° when combined.
