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Top Vent - Horizontal Termination - (continued)
Three Elbows
Figure 4.13
2. Top Vent - Vertical Termination
No Elbow
6 ft (1.8 m) min.
60 ft (18.29 m) max.
Figure 4.14
Heatilator • NNXT4236IF-B, NNXT4236ILF-B, NNXT3933IF-B, NNXT3933ILF-B Installation Manual • 2384-980 Rev. J • 6/17
Elbows Installed Vertically
H
V
2
2
V
min.
V
+V
1
1
25 ft.
12 in.
305 mm
(DVP)
V
H
1
1
Install Top Vent Flue Visor - No Elbow Configura-
tions
•
Remove the refractory retainer from one of the side
refractories.
Figure 4.11a Remove Refractory Retainer
max.
H
+H
max.
2
1
2
7.62 m
19 ft.
(DVP)
Remove lower
refractory retainer
5.79 m
23
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