E. Vent Diagrams
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 7.9.
•
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 on both sides.
•
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.
1. Top Vent - Horizontal Termination - (continued)
One Elbow
Figure 7.3
H
1
Heatilator • Eclipse • 4049-229 Rev F • 11/08
0.5
1.5
V
1
* You may install elbow directly on top of appliance.
V
min.
V
max.
1
1
ft
m
ft
m
0*
-
-
0.15
-
-
1
0.30
-
-
0.46
-
-
2
0.61
-
-
-
-
25
7.62
H
max.
1
ft
m
1.67
0.51
6
1.83
11
3.35
18
5.49
25
7.62
25
7.62
25