13
Heatilator • NNXT4236IF, NNXT4236ILF, NNXT3633IF, NNXT3633ILF Installation Manual • 4055-980 Rev. D • 9/15
C. Approved Pipe
This appliance is approved for use with Hearth & Home
Technologies DVP or SLP venting systems. Refer to Sec-
tion 12.A for vent component information and dimensions.
DO NOT
mix pipe,
fi
ttings or joining methods from differ-
ent manufacturers.
The pipe is tested to be run inside an enclosed wall.
There is no requirement for inspection openings at each
joint within the wall.
WARNING! Risk of Fire or Asphyxiation.
This appli-
ance requires a separate vent.
DO NOT
vent to a pipe
serving a separate solid fuel burning appliance.
D. Use of Elbows
Diagonal runs have both vertical and horizontal vent
aspects when calculating the effects. Use the rise for the
vertical aspect and the run for the horizontal aspect (see
Figure 4.4).
Two 45º elbows may be used in place of one 90º elbow.
On 45º runs, one foot of diagonal is equal to 8-1/2 in. (216
mm) horizontal run and 8-1/2 in. (216 mm) vertical run. A
length of straight pipe is allowed between two 45º elbows
(see Figure 4.4).
E. Measuring Standards
Vertical and horizontal measurements listed in the vent
diagrams were made using the following standards.
• Pipe measurements are shown using the effective
length of pipe (see Figure 4.5).
• Horizontal terminations are measured to the outside
mounting surface (
fl
ange of termination cap) (see
Figure 4.3).
• Vertical terminations are measured to bottom of
termination cap.
• Horizontal pipe installed level with no rise.
Horizontal
Vertical
8-1/2 in.
8-1/2 in.
12 in.
On 45° runs, 1 ft (.3 m) of diagonal is equal to 8-1/2 in. (216
mm) horizontal run and 8-1/2 in. (216 mm) vertical run.
Figure 4.4 Using Two 45° Elbows
Figure 4.5 Pipe Effective Length
Effective
Height/Length
DVP Pipe
(see chart)
Pipe
inches
mm
DVP4
4
102
DVP6
6
152
DVP12
12
305
DVP24
24
610
DVP36
36
914
DVP48
48
1219
DVP6A
3 - 6
76 - 152
DVP12A
3 - 12
76 - 305
Effective Height/Length
SLP Pipe
(see chart)
Pipe
inches
mm
SLP4
4
102
SLP6
6
152
SLP12
12
305
SLP24
24
610
SLP36
36
914
SLP48
48
1219
SLP6A
2 - 6
51 - 152
SLP12A
2 - 12
51 - 305
Effective Height/Length
Effective
Height/Length
