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3.8
horizontal termination
Simple venting configuration (only one 45°
and 90° elbow)
For vent configurations requiring more than two 90° elbows, the following formulas apply:
Formula 1: H
< V
T
T
Formula 2: H
+ V
< 40 feet (12.2m)
T
T
Example:
= 8 FT (2.4m)
V
1
V
= V
= 8 FT (2.4m)
T
1
= 2.5 FT (0.8m)
H
1
H
= 2 FT (0.6m)
2
H
= H
+ H
= 2.5FT (0.8m) + 2FT (0.6m) = 4.5FT (1.4m)
R
1
2
= .03 (one 45° elbows + two 90° elbows -135°) = .03 (225 - 135°) = 2.7 FT (0.8m)
H
O
H
= H
+ H
= 4.5FT (1.4m) + 2.7FT (0.8m) = 7.2FT (2.2m)
T
R
O
H
+ V
= 7.2FT (2.2m) + 8FT (2.4m) = 15.2 FT (4.6m)
T
T
Formula 1:
H
< V
T
T
7.2 FT (2.2m) < 8 FT (2.4m)
Formula 2:
H
+ V
< 40 FT (12.2m)
T
T
15.2 FT (4.6m) < 40 FT (12.2m)
Since both formulas are met, this vent configuration is acceptable.
minimum venting requirements
(H
) < (V
)
T
T
See graph to determine the required vertical rise V
39 (11.9)
REQUIRED
30 (9.1)
VERTICAL RISE
IN FEET
20 (6.1)
(METERS) V
T
10 (3.1)
0
2.5
(0.8)
HORIZONTAL VENT RUN PLUS OFFSET IN FEET (METERS) H
The shaded area within the lines represents acceptable
45°
for the required
T
horizontal run H
.
T
5
7.5
10
12.5
15
(1.5)
(2.3)
(3.1)
(3.8)
(4.6)
values for H
and H
T
T
90°
H
V
1
H
1
90°
13.3
W415-4020 / 08.09.21
EN
17.5
20
(5.3)
(6.1)
T
2
17
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