Heatilator • Novus DV • 4031-550 Rev G • 11/07
17
Top Vent—Horizontal Termination—Two or Three Elbows
You may use a maximum of three 90° elbows (or six 45° elbows) in any vent con
fi
guration, Some may be installed hori-
zontally.
H
1
V
1
H
2
H
3
Installed
Horizontally
Installed
Vertically
H
2
Figure 5.6 Two or Three Elbows, some Horizontal
Note: Subtract 3 ft (914 mm) from the total horizontal
measurement
for each 90° elbow installed horizontally.
Subtract 1-1/2 ft (457 mm) from the total horizontal
measurement
for each 45° elbow installed horizontally.
Table 5.3
V
1
min.
V
1
max.
H
1
+H
2
max.
H
1
+H
2
+H
3
max.
6 in./152 mm
x
6 ft/1.83 m
x
12 in./305 mm
x
11 ft/3.35 m
11 ft/3.35 m
18 in./457 mm
x
18 ft/5.49 m
18 ft/5.49 m
24 in./610 mm
x
25 ft/7.62 m
25 ft/7.62 m
x
25 ft/7.62 m
25 ft/7.62 m
25 ft/7.62 m
