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3.9
VERTICAL TERMINATION
Simple venting configurations.
For vent configurations requiring more than one 90° elbow, the following formulas apply:
Formula 1: H
< V
T
Formula 2: H
+ V
T
Example:
V
= 5 FT
1
V
= 10 FT
2
V
= V
+ V
= 5 + 10 = 15 FT
T
1
2
H
= 3 FT
1
H
= 2.5 FT
2
H
= H
+ H
= 3 + 2.5 = 5.5 FT
R
1
2
H
= .03 (three 90° elbows - 90°)
O
= .03 (270° - 90°) = 5.4 FT
H
= H
+ H
= 5.5 + 5.4 = 10.9 FT
T
R
O
H
+ V
= 10.9 + 15 = 25.9 FT
T
T
Formula 1:
Formula 2:
Since both formulas are met, this vent configuration is acceptable.
T
< 40 feet
T
H
< V
T
T
10.9 < 15
H
+ V
< 40 FT
T
T
25.9 < 40
(H
) < (V
)
T
T
See graph to determine the required vertical rise V
required horizontal run H
40
30
REQUIRED
VERTICAL
20
RISE IN
FEET V
T
10
3
0
HORIZONTAL VENT RUN PLUS OFFSET IN FEET H
The shaded area within the lines represents acceptable
.
T
5
10
15
values for H
and V
T
T
V
2
90°
H
2
V
1
H
90°
1
18.6
W415-0662 / D / 08.10.12
17
for the
T
20
T
90°
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