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Top Vent—Horizontal Termination—Two or Three Elbows
You may use a maximum of three 90° elbows (or six 45° elbows) in any vent confi guration, Some may be installed hori-
zontally.
Figure 5.6
Two or Three Elbows, some Horizontal
16
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.
V
min.
V
max.
1
1
18 in./457 mm
x
24 in./610 mm
x
x
25 ft/7.62 m
H
Installed
Horizontally
H
H
2
2
Heatilator • ICON DV • 4042-300 Rev R • 06/07
Table 5.3
H
+H
max.
H
+H
1
2
1
18 ft/5.49 m
25 ft/7.62 m
25 ft/7.62 m
3
+H
max.
2
3
18 ft/5.49 m
25 ft/7.62 m
25 ft/7.62 m
Installed
Vertically
H
1
V
1
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