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W415-0773 / E / 03.13.12
3.6 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
3.7 ELBOW VENT LENGTH VALUES
15.1
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 fi rst 90° offset has a zero value and is shown in the formula as - 90°
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