Quadra-Fire QFP38-NG - Manual (Page 34)

Quadra-Fire • QFP38 Series • 4061-300 Rev i • 9/09 34
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.
feet 1 - 5
meters 0.30 1.52
feet 2 - 10
meters 0.61 3.05
feet 3 - 15
meters 0.91 4.57
feet 4 - 20
meters 1.22 6.10
feet 25 20
meters 7.62 6.10