EN
W415-1769 / B / 08.27.18
15
venting requirements
2.5 definitions
14.1
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 - 90°*) in feet
V
T
- combined vertical vent lengths in feet
2.6 elbow vent length values
15.1A
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 90° offset has a zero value and is shown in the formula as - 90°
