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venting
EN
2.6
elbow vent length values
Feet
1°
0.03
15°
0.45
30°
0.9
45°
1.35
90°*
2.7
* 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).
2.7
top exit horizontal termination
Simple venting confi guration (only one 90° elbow)
For vent confi gurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H
< V
T
Formula 2: H
+ V
T
Example:
V
= 3 FT (0.9m)
1
V
= 8 FT (2.4m)
2
V
= V
+ V
= 3 FT (0.9m ) + 8 FT (2.4m) = 11 FT (3.4m)
T
1
2
H
= 2.5 FT (0.8m)
1
H
= 2 FT (0.6m)
2
H
= H
+ H
= 2.5 FT (0.8m) + 2 FT (0.6m) = 4.5 FT (1.4m)
R
1
2
H
= .03 (three 90° elbows - 90°) = .03 (270° - 90°) = 5.4 FT (1.7m)
O
H
= H
+ H
= 4.5 FT (1.4m) + 5.4 FT (1.6m) = 9.9 FT (3m)
T
R
O
H
+ V
= 9.9 FT (3m) + 11 FT (3.4m) = 20.9 FT (6.4m)
T
T
Formula 1:
H
9.9 FT (3m) < 11 FT (3.4m)
Formula 2:
H
20.9 FT (6.4m) < 40 FT (12.2m)
Since both formulas are met, this vent confi guration is acceptable.
16
W415-2360 / A / 10.31.19
Inches
Millimeters
0.5
12.7
6.0
152.4
11.0
279.4
16.0
406.4
32.0
812.8
REQUIRED
VERTICAL
RISE IN FEET
(METERS)V
T
< 40 feet (12.2m)
T
< V
T
T
+ V
< 40 FT (12.2m)
T
T
(H
) < (V
)
T
T
See graph to determine the required vertical
rise V
for the required horizontal run H
T
40 (12.2)
39 (11.9)
30 (9.1)
20 (6.1)
T
10 (3.1)
0
2.5
5
7.5
(0.8)
(1.5)
(2.3)
HORIZONTAL VENT RUN PLUS OFFSET IN
FEET (METERS) H
The shaded area within the lines represents
acceptable values for H
10
12.5
15
17.5
(3.1)
(3.8)
(4.6)
(5.3)
T
and V
T
T
90°
H
2
V
2
90°
H
90°
1
V
1
.
T
20
(6.1)
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