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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.
•
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
One Elbow
Figure 7.3
H
1
V
Min.
V
Max.
1
1
3 ft (.91 m)
-
4 ft (1.22 m)
-
5 ft (1.52)
-
6 ft (1.83 m)
-
7 ft (2.13 m)
-
10 ft (3.05 m)
25 ft (7.62 m)
Quadra-Fire • QFP44 • 4051-300 • Rev. U • 4/11
V
1
H
Max.
1
1.5 ft (.46 m)
6 ft (1.83 m)
11 ft (3.35 m)
13 ft (3.96 m)
15 ft (4.57 m)
20 ft (6.10 m)
29
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