Heatilator • Novus DV • 4031-550 Rev G • 11/07
15
Fire Risk
Explosion Risk
Do NOT pack insulation or other combustibles between
fi
restops.
• ALWAYS maintain speci
fi
ed clearances around venting and
fi
restop systems.
• Install
fi
restops as speci
fi
ed.
Failure to keep insulation or other material away from vent pipe may cause
fi
re.
WARNING
D. Vent Diagrams
The
fi
rst 90° elbow MUST be a starter elbow.
To replace the
fi
rst starter elbow with two 45° elbows, refer to Figure 5.4 All other 90° elbows can be replaced with two 45°
elbows.
General Rules:
•
SUBTRACT 3 ft (914 mm) from the total H measurement for each 90° elbow installed horizontally.
SUBTRACT 1-1/2 ft (457 mm) 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
fi
guration. Some elbows may be installed
horizontally. See Figure 5.6.
•
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 5.4.
•
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.
H
1
V
1
Figure 5.3 Top Vent-Horiztonal Termination-One Elbow
Top Vent—Horizontal Termination—One Elbow
Table 5.1
V
1
Min
V
1
Max
H
1
Max.
0*
-
24 in./635 mm
4 in./102 mm
-
4 ft/1.22 m
6 in./152 mm
-
6 ft/1.83 m
12 in./305 mm
-
11 ft/3.35 m
18 in./457 mm
-
18 ft/5.49 m
24 in./610 mm
-
25 ft/7.62 m
-
25 ft/7.62 m
25 ft/7.62 m
* You may install the elbow directly on top of the
appliance.
