16.5_2A
Simple venting confi guration (only one 45° and 90°
elbow)
90°
90°
45°
V
1
H
1
H
4
90°
90°
H
3
H
2
V
2
90°
90°
45°
V
1
H
1
H
2
REQUIRED
VERTICAL RISE
IN INCHES
(METERS)
V
T
0
5
(1.5)
15
(4.6)
20
(6.1)
100 (2.54)
50 (12.7)
150 (3.81)
12.5
(3.8)
57 (1447.8)
147 (3.73)
10
(3.1)
0
2.5
(0.8)
5
(1.5)
7.5
(2.3)
10
(3.1)
12.5
(3.8)
15
(4.6)
40 (12.2)
10 (3.1)
20 (6.1)
30 (9.1)
17.5
(5.3)
20
(6.1)
39 (11.9)
REQUIRED
VERTICAL
RISE IN FEET
(METERS)
V
T
HORIZONTAL VENT RUN PLUS OFFSET IN
FEET (METERS)
H
T
HORIZONTAL VENT RUN PLUS
OFFSET IN FEET (METERS)
H
T
(H
T
) > (V
T
)
For vent confi gurations requiring more than one 45° elbow and 90° elbow, the following formulas
apply:
Formula 1: H
T
< 4.2 V
T
Formula 2: H
T
+ V
T
< 24.75 feet (7.5m)
Example:
V
1
= 4 FT (1.2m)
V
2
= 1.5 FT (0.5m)
V
T
=
V
1
+
V
2
= 4 FT (1.2m) + 1.5 FT (0.5m) = 5.5 FT (1.7m)
H
1
= 2 FT (0.6m)
H
2
= 1 FT (0.3m)
H
3
= 1 FT (0.3m)
H
4
= 1.5 FT (0.5m)
H
R
=
H
1
+
H
2
+
H
3
+
H
4
= 2FT (0.6m) + 1FT (0.3m) + 1FT (0.3m) + 1.5FT (0.5m) = 5.5 FT (1.7m)
H
O
= .03 (one 45° elbow + four 90° elbows - 135°) = .03 (405 - 135°) = 8.1 FT (2.5m)
H
T
=
H
R
+
H
O
= 5.5 FT (1.7m) + 8.1
FT (2.5m)
= 13.6 FT (4.2m)
H
T
+
V
T
= 13.6 FT (4.2m) + 5.5 FT (1.7m) = 19.1 FT (5.8m)
Formula 1:
H
T
< 4.2FT (1.3m) V
T
4.2FT (1.3m) V
T
= 4.2 FT (1.3m) x 5.5 FT (1.7m)= 23.1 FT (7m)
13.6 FT (4.2m) < 23.1 FT (7M)
Formula 2:
H
T
+ V
T
< 24.75 FT (7.5m)
19.1 FT (5.8m) < 24.75 FT (7.5m)
Since both formulas are met, this vent confi guration is acceptable.
90°
90°
45°
V
1
H
1
H
4
90°
90°
H
3
H
2
V
2
90°
90°
45°
V
1
H
1
H
2
REQUIRED
VERTICAL RISE
IN INCHES
(METERS)
V
T
0
5
(1.5)
15
(4.6)
20
(6.1)
100 (2.54)
50 (12.7)
150 (3.81)
12.5
(3.8)
57 (1447.8)
147 (3.73)
10
(3.1)
0
2.5
(0.8)
5
(1.5)
7.5
(2.3)
10
(3.1)
12.5
(3.8)
15
(4.6)
40 (12.2)
10 (3.1)
20 (6.1)
30 (9.1)
17.5
(5.3)
20
(6.1)
39 (11.9)
REQUIRED
VERTICAL
RISE IN FEET
(METERS)
V
T
HORIZONTAL VENT RUN PLUS OFFSET IN
FEET (METERS)
H
T
HORIZONTAL VENT RUN PLUS
OFFSET IN FEET (METERS)
H
T
90°
90°
45°
V
1
H
1
H
4
90°
90°
H
3
H
2
V
2
90°
90°
45°
V
1
H
1
H
2
REQUIRED
VERTICAL RISE
IN INCHES
(METERS)
V
T
0
5
(1.5)
15
(4.6)
20
(6.1)
100 (2.54)
50 (12.7)
150 (3.81)
12.5
(3.8)
57 (1447.8)
147 (3.73)
10
(3.1)
0
2.5
(0.8)
5
(1.5)
7.5
(2.3)
10
(3.1)
12.5
(3.8)
15
(4.6)
40 (12.2)
10 (3.1)
20 (6.1)
30 (9.1)
17.5
(5.3)
20
(6.1)
39 (11.9)
REQUIRED
VERTICAL
RISE IN FEET
(METERS)
V
T
HORIZONTAL VENT RUN PLUS OFFSET IN
FEET (METERS)
H
T
HORIZONTAL VENT RUN PLUS
OFFSET IN FEET (METERS)
H
T
See graph to determine the required vertical
rise
V
T
for the required horizontal run
H
T
.
The shaded area within the lines represents acceptable values for
H
T
and
V
T
0
5
(1.5)
15
(4.6)
20
(6.1)
100 (2540)
50 (1270)
150 (3810)
12.5
(3.8)
57 (1447.8)
147 (3733.8)
10
(3.1)
24” (610mm)
MIN.
H
T must be > 24” (610mm)
W415-2207 / A / 08.28.17
14
EN
