
23
Heatilator • NNXT33-IFT, NNXT33L-IFT, NNXT36-IFT, NNXT36L-IFT Installation Manual • 2628-980 Rev. C • 8/20
Figure 4.15
Top Vent - Horizontal Termination
- (continued)
Three Elbows
H
2
H
1
V
2
V
1
Elbows Installed Vertically
2. Top Vent - Vertical Termination
No Elbow
Figure 4.16
6 ft (1.8 m) min.
60 ft (18.29 m) max.
Install Top Vent Flue Visor - No Elbow Configura
-
tions
• Remove the refractory retainer from one of the side
refractories.
Remove lower
refractory retainer
Figure 4.17 Remove Refractory Retainer
V
1
min.
V
1
+V
2
max.
H
1
+H
2
max.
12 in.
305 mm
25 ft.
(DVP)
7.62 m
(DVP)
19 ft.
5.79 m
V
1
+ V
2
+ H
1
+ H
2
= 44 ft. (13.41 m) Maximum