Heatilator • Novus NNXT • 4055-879 • Rev E • 5/10
24
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 7.8.
• 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
Note: The NNXT 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
1
min.) requirements.
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.
H
1
= 11 ft.
max.
V
1
= 1 ft.
DVP-SLP24
H
1
= 11 ft.
max
V
1
= 1 ft.
DVP
HORIZONTAL EXAMPLE
SLP
12 ft (3.66 m) min.
60 ft (18.29 m) max.
12 ft (3.66 m) min.
60 ft (18.29 m) max.
DVP
VERTICAL EXAMPLE
SLP
DVP-SLP24
Adapter
V1 min.
V1 max.
H1 max.
ft
m
ft
m
ft
m
0
0.00
-
-
2
0.61
0.33
0.10
-
-
4
1.22
0.5
0.15
-
-
6
1.83
1
0.30
-
-
11
3.35
1.5
0.46
-
-
18
5.49
2
0.61
-
-
25
7.62
DVP
25
7.62
17
5.18
SLP
23
7.01
17
5.18
You may install the elbow directly on top
of the appliance (DVP only).
