Heatilator • AVEO Series DV • 4058-210 Rev P • 1/13
24
H
1
V
1
To replace the fi rst starter elbow with two 45° elbows,
refer to Figure 7.4. All other 90° elbows can be replaced
with two 45° elbows.
General Rules:
•
SUBTRACT 3 ft. from the total H measurement for each
90° elbow installed horizontally.
• SUBTRACT 1-1/2 ft. from the total H measurement for
each 45° elbow installed horizontally.
• A maximum of three 90° elbows (or six 45° elbows)
may be used in any vent confi guration. Some elbows
may be installed horizontally. See Figure 7.5.
• Elbows may be placed back to back anywhere in the
system as long as the fi rst 90° elbow is a starter elbow
except as shown in Figure 7.4.
• When penetrating a combustible wall, a wall shield
fi restop must be installed.
• When penetrating a combustible ceiling, a ceiling
fi restop must be installed.
• Horizontal runs of vent do not require vertical rise;
horizontal runs may be level.
E. Vent Diagrams
Figure 7.3
One Elbow
1. Top Vent - Horizontal Termination
V
1
Min.
V
1
Max.
H
1
Max.
0*
-
18 in./.46 m
6 in./152 mm
-
6 ft/1.83 m
1 ft/.31 m
-
11 ft/3.35 m
1-1/2 ft/.46 m
-
18 ft/5.49 m
2 ft/.61 m
-
25 ft/7.62 m
-
25 ft/7.52 m
25 ft/7.62 m
* You may install the elbow directly on top of the
appliance
Note:
The fi rst elbow used in the system
must be a starter elbow
