Quadra-Fire QFP44 - Manuel (Page 30)

Quadra-Fire • QFP44 • 4051-300 Rev M • 09/08 30
H
1
V
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To replace the ¿ 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 con¿ 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 ¿ rst 90° elbow is a starter elbow
except as shown in Figure 7.4.
• When penetrating a combustible wall, a wall shield
¿ restop must be installed.
• When penetrating a combustible ceiling, a ceiling
¿ 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.
3 ft (.91 m) - 1.5 ft (.46 m)
4 ft (1.22 m) - 6 ft (1.83 m)
5 ft (1.52) - 11 ft (3.35 m)
6 ft (1.83 m) - 13 ft (3.96 m)
7 ft (2.13 m) - 15 ft (4.57 m)
10 ft (3.05 m) 25 ft (7.62 m) 20 ft (6.10 m)