W415-2884 / A / 09.21.20
EN
14
venting
2.6
top exit horizontal termination
90°
90°
45°
V
1
H
1
H
2
Simple venting configuration (only one 45°
and 90° elbow)
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
= 8 FT (2.4m)
V
T
=
V
1
= 8 FT (2.4m)
H
1
= 2.5 FT (0.8m)
H
2
= 2 FT (0.6m)
H
R
=
H
1
+ H
2
= 2.5FT (0.8m) + 2FT (0.6m) = 4.5FT (1.4m)
H
O
= .03 (one 45° two 90° elbows -135°) = .03 (225 - 135°) = 2.7 FT (0.8m)
H
T
=
H
R
+ H
O
= 4.5FT (1.4m) + 2.7FT (0.8m) = 7.2FT (2.2m)
H
T
+ V
T
= 7.2FT (2.2m) + 8FT (2.4m) = 15.2 FT (4.6m)
Formula 1:
H
T
< V
T
7.2 FT (2.2m) < 8 FT (2.4m)
Formula 2:
H
T
+ V
T
< 40 FT (12.2m)
15.2 FT (4.6m) < 40 FT (12.2m)
Since both formulas are met, this vent configuration is acceptable.
0
2.5
(0.8)
5
(1.5)
7.5
(2.3)
10
(3.1)
12.5
(3.8)
15
(4.6)
10 (3.1)
20 (6.1)
30 (9.1)
17.5
(5.3)
20
(6.1)
39 (11.9)
