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Simple venting confi guration (only one 45° and 90°
elbow)
For vent confi gurations requiring more than one 45° elbow and 90° elbow, the following formulas
apply:
H
Formula 1: H
4
V
2
Formula 2: H
Example:
V
= 4 FT (1.2m)
1
V
= 1.5 FT (0.5m)
2
V
= V
T
H
= 2 FT (0.6m)
1
H
= 1 FT (0.3m)
2
H
= 1 FT (0.3m)
3
90°
H
= 1.5 FT (0.5m)
4
H
= H
R
H
= .03 (one 45° elbow + four 90° elbows - 135°) = .03 (405 - 135°) = 8.1 FT (2.5m)
O
H
= H
T
V
H
+ V
1
T
Formula 1:
45°
H
1
90°
Formula 2:
Since both formulas are met, this vent confi guration is acceptable.
The shaded area within the lines represents acceptable values for H
< 4.2 V
90°
T
T
H
+ V
< 24.75 feet (7.5m)
1
T
T
90°
V
1
45°
+ V
= 4 FT (1.2m) + 1.5 FT (0.5m) = 5.5 FT (1.7m)
1
2
H
2
+ H
+ H
+ H
= 2FT (0.6m) + 1FT (0.3m) + 1FT (0.3m) + 1.5FT (0.5m) = 5.5 FT (1.7m)
1
2
3
4
+ H
= 5.5 FT (1.7m) + 8.1 FT (2.5m) = 13.6 FT (4.2m)
R
O
= 13.6 FT (4.2m) + 5.5 FT (1.7m) = 19.1 FT (5.8m)
T
H
< 4.2FT (1.3m) V
T
4.2FT (1.3m) V
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
REQUIRED
VERTICAL RISE
IN INCHES
(MILLIMETERS) V
90°
90°
H
H
4
3
V
2
40 (12.2)
H
39 (11.9)
2
30 (9.1)
REQUIRED
VERTICAL
20 (6.1)
RISE IN FEET
(METERS) V
T
10 (3.1)
0
2.5
(0.8)
HORIZONTAL VENT RUN PLUS OFFSET IN
45°
T
H
= 4.2 FT (1.3m) x 5.5 FT (1.7m)= 23.1 FT (7m)
T
See graph to determine the required vertical
rise V
for the required horizontal run H
T
150 (3810)
147 (3733.8)
100 (2540)
T
57 (1447.8)
50 (1270)
0
5
(1.5)
(3.1)
HORIZONTAL VENT RUN PLUS
OFFSET IN FEET (METERS) H
90°
H
90°
H
1
90°
V
1
45°
5
7.5
10
12.5
(1.5)
(2.3)
(3.1)
(3.8)
90°
H
2
FEET (METERS) H
T
V
1
1
90°
16.5_2A
17
EN
.
T
10
15
20
(4.6)
(6.1)
12.5
(3.8)
T
and V
T
T
90°
H
4
3
V
2
REQUIRED
H
2
VERTICAL
RISE IN FEET
(METERS) V
T
15
17.5
20
(4.6)
(5.3)
(6.1)
45°
H
1
W415-1285 / F / 12.21.16
(
40
39 (11
3
2
1
90
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