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16
Simple venting confi guration (only one 45° and 90°
EN
elbow)
For vent confi gurations requiring more than one 45° elbow and 90° elbow, the following formulas
apply:
Formula 1: H
Formula 2: H
Example:
= 4 FT (1.2m)
V
1
= 1.5 FT (0.5m)
V
2
= V
+ V
V
T
1
= 2 FT (0.6m)
H
1
= 1 FT (0.3m)
H
2
= 1 FT (0.3m)
H
3
= 1.5 FT (0.5m)
H
4
= H
+ H
H
R
1
= .03 (one 45° elbow + four 90° elbows - 135°) = .03 (405 - 135°) = 8.1 FT (2.5m)
H
O
= H
+ H
H
T
R
+ V
= 13.6 FT (4.2m) + 5.5 FT (1.7m) = 19.1 FT (5.8m)
H
T
T
Formula 1:
Formula 2:
Since both formulas are met, this vent confi guration is acceptable.
W415-1285 / 04.14.14
The shaded area within the lines represents acceptable values for H
< 4.2 V
T
T
+ V
< 24.75 feet (7.5m)
T
T
= 4 FT (1.2m) + 1.5 FT (0.5m) = 5.5 FT (1.7m)
2
+ H
+ H
= 2FT (0.6m) + 1FT (0.3m) + 1FT (0.3m) + 1.5FT (0.5m) = 5.5 FT (1.7m)
2
3
4
= 5.5 FT (1.7m) + 8.1 FT (2.5m) = 13.6 FT (4.2m)
O
H
< 4.2FT (1.3m) V
T
T
= 4.2 FT (1.3m) x 5.5 FT (1.7m)= 23.1 FT (7m)
4.2FT (1.3m) V
T
13.6 FT (4.2m) < 23.1 FT (7M)
H
+ V
< 24.75 FT (7.5m)
T
T
19.1 FT (5.8m) < 24.75 FT (7.5m)
(H
) > (V
)
T
T
See graph to determine the required vertical
rise V
for the required horizontal run H
T
150 (3810)
147 (3733.8)
REQUIRED
VERTICAL RISE
100 (2540)
IN INCHES
(MILLIMETERS) V
T
57 (1447.8)
HORIZONTAL VENT RUN PLUS
OFFSET IN FEET (METERS) H
90°
V
1
50 (1270)
0
5
10
15
(1.5)
(3.1)
(4.6)
(6.1)
12.5
(3.8)
T
90°
90°
H
3
V
H
2
1
H
2
90°
45°
16.5_2A
.
T
20
T
and V
T
H
4
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