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2.4
defi nitions
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
- total of both horizontal vent lengths (Hr) and offsets (Ho) in feet
T
H
- combined horizontal vent lengths in feet
R
H
- offset factor: .03 (total degrees of offset - 90°*) in feet
O
H
- offset factor: .03 (total degrees of offset - 135°*) in feet
O
V
- combined vertical vent lengths in feet
T
2.5
elbow 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 fi rst 90° offset has a zero value and is shown in the formula as - 90°
* The fi rst 45° and° offset have a zero value and is shown in the formula as -45° and -90° respectively
or -135° when combined (for 45° exit only).
Millimeters
12.7
152.4
279.4
406.4
812.8
venting
EN
13
W415-2884 / A / 09.21.20
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