W415-3096 / C / 05.03.22
EN
18
venting requirements
2.8 rear exit horizontal termination
0
2.5
(0.8)
5
(1.5)
7.5
(2.3)
10
(3.1)
12.5
(3.8)
15
(4.6)
40 (12.2)
10 (3.1)
20 (6.1)
30 (9.1)
17.5
(5.3)
20
(6.1)
1.6
(0.5)
1.6 (0.5)
38.3 (11.7)
90°
V
1
V
2
H
1
H
2
90°
90°
90°
H
3
Simple venting configuration
(only two 90° elbows)
See graph to determine the required vertical rise
V
T
for the required
horizontal run
H
T
.
REQUIRED
VERTICAL
RISE IN FEET
(METERS)
V
T
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS)
H
T
The shaded area within the lines represents acceptable values for
H
T
and
H
T
(H
T
) < (V
T
)
For vent configurations requiring more than two 90° elbows, the following formulas apply:
Formula 1: H
T
< V
T
Formula 2: H
T
+ V
T
< 40 feet (12.2m)
Example:
V
1
= 9 FT (2.7m)
V
2
= 6 FT (1.8m)
V
T
=
V
1
+ V
2
= 9FT (2.7m) + 6FT (1.8m) = 15FT (4.6m)
H
1
= 3 FT (0.9m)
H
2
= 2 FT (0.6m)
H
3
= 1.5 FT (0.5m)
H
R
=
H
1
+ H
2
+ H
3
= 3FT (0.9m) + 2FT (0.6m) + 1.5FT (0.5m) = 6.5FT (2m)
H
O
= .03 (four 90° elbows - 90°) = .03 (360° - 90°) = 8.1 FT (2.5m)
H
T
=
H
R
+ H
O
= 6.5FT (2m) + 8.1FT (2.5m) = 14.6FT (4.5m)
H
T
+ V
T
= 14.6FT (4.5m) + 15FT (4.6m) = 29.6 FT (9m)
Formula 1:
H
T
< V
T
14.6 FT (4.5m) < 15 FT (4.6m)
Formula 2:
H
T
+ V
T
< 40 FT (12.2m)
29.6 FT (9m) < 40 FT (12.2m)
Since both formulas are met, this vent configuration is acceptable.
13.2
