Vent Diagrams - Heatilator NNXT4236IF Installation Manual

F. Vent Diagrams
To replace the fi rst starter elbow with two 45° elbows,
refer to Figure 4.8 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 4.12.
• 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 4.8.
• 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.
• Horizontal termination cap should have a 1/4 inch
downward slant to allow any moisture in cap to be
released.
1. Top Vent - Horizontal Termination
One Elbow
V1 min. V1 max.
ft m ft
0 0.00 -
0.33 0.10 -
0.5 0.15 -
1 0.30 -
1.5 0.46 -
2 0.61 -
DVP 25
SLP 23
You may install the elbow directly on
top of the appliance (DVP only).
Figure 4.6
14 Heatilator • NNXT4236IF, NNXT4236ILF, NNXT3633IF, NNXT3633ILF Installation Manual • 4055-980 Rev. D • 9/15
V
H
1
H1 max.
m ft m
- 2 0.61
- 4 1.22
- 6 1.83
- 11 3.35
- 17 5.18
- 17 5.18
7.62 17 5.18
7.01 17 5.18
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 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.
1
12 ft (3.66 m) min.
60 ft (18.29 m) max.
Figure 4.7
HORIZONTAL EXAMPLE
V = 1 ft.
1
H = 11 ft.
1
max.
DVP
V = 1 ft.
1
H = 11 ft.
1
max.
DVP-SLP24
SLP
VERTICAL EXAMPLE
12 ft (3.66 m) min.
60 ft (18.29 m) max.
DVP
DVP-SLP24
Adapter
SLP