Simple venting configurations.
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
v
T
0
5
(1.5)
10
(3.1)
15
(4.6)
20
(6.1)
10 (3.1)
20 (6.1)
3 (0.9)
25
(7.6)
30
(9.1)
19 (5.8)
(H
T
) > (V
T
)
90°
V
1
V
2
H
1
H
2
90°
90°
H
3
45°
For vent configurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H
T
< 3 V
T
Formula 2: H
T
+ V
T
< 40 FT (12.2m)
Example:
V
1
= 1.5 FT (0.5m)
V
2
= 5 FT (1.5m)
V
T
=
V
1
+ V
2
= 1.5FT (0.5m) + 5FT (1.5m) = 6.5 FT (2m)
H
1
= 1 FT (0.3m)
H
2
= 1 FT (0.3m)
H
3
= 10.75 FT (3.3m)
H
R
=
H
1
+ H
2
+ H
3
= 1FT (0.3m) + 1FT (0.3m) + 10.75FT (3.3m) = 12.75 FT (3.9m)
H
O
= .03 (three 90° one 45° elbow - 90°)
= .03 (270° + 45° - 90°) = 6.75 FT (2.1m)
H
T
=
H
R
+ H
O
= 12.75FT (3.9m) + 6.75FT (2.1m) = 19.5 FT (5.9m)
H
T
+ V
T
= 19.5FT (5.9m) + 6.5FT (2m) = 26 FT (7.9m)
Formula 1:
H
T
< 3 V
T
3 V
T
=
3FT (0.9m) x 6.5FT (2m) = 19.5FT (5.9m)
19.5FT (5.9m) = 19.5FT (5.9m)
Formula 2:
H
T
+ V
T
< 40 FT (12.2m)
26 FT (7.9m) < 40 FT (12.2m)
Since both formulas are met, this vent configuration is acceptable.
EN
W415-2366 / A / 10.07.19
17
venting requirements
