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Simple venting configurations.
For vent configurations requiring more than two 90° elbows the following formulas apply:
Formula 1: H
< 3V
T
T
Formula 2: H
+ V
< 40 feet
T
T
Example:
V
= 2 FT
1
V
= 1 FT
2
V
= 1.5 FT
3
V
= V
+ V
+ V
= 2 + 1 + 1.5 = 4.5 FT
T
1
2
3
H
= 6 FT
1
H
= 2 FT
2
H
= H
+ H
= 6 + 2 = 8 FT
R
1
2
H
= .03 (four 90° elbows - 90°)
O
= .03 (360° - 90°) = 8.1 FT
H
= H
+ H
= 8 + 8.1 = 16.1 FT
T
R
O
H
+ V
= 16.1 + 4.5 = 20.6 FT
T
T
Formula 1:
H
< 3V
T
T
3V
T
16.1 > 13.5
Since this formula is not met, this vent configuration is unacceptable.
Formula 2:
H
+ V
< 40 feet
T
T
20.6 < 40
Since only formula 2 is met, this vent configuration is unacceptable and a new appliance location or vent configuration will
need to be established to satisfy both formulas.
(H
REQUIRED
VERTICAL
RISE IN
FEET V
= 3 x 4.5 = 13.5 FT
) > (V
)
T
T
See graph to determine the required vertical rise V
required horizontal run H
20
19
10
T
3
0
5
HORIZONTAL VENT RUN PLUS OFFSET IN FEET H
The shaded area within the lines represents acceptable
90°
V
1
.
T
10
15
20
values for H
and V
T
T
90°
H
2
H
V
1
2
90°
18.1_2A
W415-0748 / C / 08.20.12
17
for the
T
25
30
T
V
3
90°
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