Vent Diagrams - Heatilator Direct Vent Gas Appliance CNXT4236IH Owner's Manual

E. Vent Diagrams
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 7.9.
• 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.
1. Top Vent - Horizontal Termination
One Elbow
H
1
V min.
1
ft m ft
0 0.00 -
0.5 0.15 -
1 0.30 -
1.5 0.46 -
2 0.61 -
DVP 25
SLP 23
You may install a DVP elbow directly on top of the
CNXT4236 and on top of the CNXT4842.
Figure 7.3
V
1
V max. H max.
1 1
m ft m
- 1.5 0.46
- 6 1.83
- 11 3.35
- 18 5.49
- 25 7.62
7.62 25 7.62
7.01 23 7.01
Heatilator • Caliber CNXT Series • 4047-132 Rev U • 11/08
Note: The CNXT series appliances can adapt to
SLP series vent pipe when venting off the top of
the appliance. You must use a DVP-SLP24 adapter
which can only be attached to the appliance starting
collar.
When looking at horizontal termination diagrams, the
adapter is not counted as part of the minimum vertical
(V min.) requirements.
1
Whether horizontal or vertical termination, the adapter is
counted as part of the maximum vertical limitations.
All venting rules for the vent run must still be followed.
HORIZONTAL EXAMPLE
H
= 11 ft.
1
max.
H
= 11 ft.
1
max
VERTICAL EXAMPLE
12 ft (3.66 m) min.
60 ft (18.29 m) max.
DVP
V = 1 ft.
1
DVP
V = 1 ft.
1
DVP-SLP24
SLP
DVP-SLP24
Adapter
12 ft (3.66 m) min.
60 ft (18.29 m) max.
SLP
23