Vent Diagrams - Heatilator CNXT4236IT Owner's Manual

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 confi 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.
Top Vent—Horizontal Termination—One Elbow
Fire Risk
Explosion Risk
Do NOT pack insulation or other combustibles between fi restops.
• ALWAYS maintain specifi ed clearances around venting and fi restop systems.
• Install fi restops as specifi ed.
Failure to keep insulation or other material away from vent pipe may cause fi re.
V1 min.
0*
4 in/102 mm
6 in./152 mm
12 in./305 mm
18 in./457 mm
24 in./610 mm
-
* You may install the elbow directly on top of
Figure 5.3 Top Vent-Horizontal Termination-One Elbow
Heatilator • Caliber CNXT Series • 4047-132 Rev P • 11/07
WARNING
Table 5.1
V1 max. H1 max.
- 18 in./457 mm
- 4 ft/1.22 m
- 6 ft/1.83 m
- 11 ft/3.35 m
- 18 ft/5.49 m
- 25 ft/7.62 m
25 ft/7.62 m 25 ft/7.62 m
the CNXT4236 or CNXT4842.
H
1
V
1
15