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E. Vent Diagrams
To replace the first 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 ft. from the total H measurement for each
90° elbow installed horizontally.
•
SUBTRACT -/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 configuration. 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 first 90° elbow is a starter elbow
except as shown in Figure 7.4.
•
When penetrating a combustible wall, a wall shield
firestop must be installed on both sides.
•
When penetrating a combustible ceiling, a ceiling
firestop 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 I • 08/09
0.5
.5
V
1
* You may install elbow directly on top of appliance.
V
min.
V
max.
1
1
ft
m
ft
m
0*
-
-
0.5
-
-
0.0
-
-
0.46
-
-
2
0.6
-
-
-
-
25
7.62
H
max.
1
ft
m
.67
0.5
6
.8
.5
8
5.49
25
7.62
25
7.62
25
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