Heatilator • Caliber CNXT Series • 4047-132 Rev P • 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 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
fi
guration. Some elbows may be installed
horizontally. See Figure 5.6.
• Elbows may be placed back to back anywhere in the system 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-Horizontal Termination-One Elbow
Top Vent—Horizontal Termination—One Elbow
Table 5.1
V1 min.
V1 max.
H1 max.
0*
-
18 in./457 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 CNXT4236 or CNXT4842.
Summary of Contents for CNXT4236IH CNXT4842IH
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