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Heatilator • CNXT4236IT-D, CNXT4842IT-D, CNXT4236IH-D, CNXT4842IH-D • 2360-900 Rev. i • 5/17
32
FLUE
RESTRICTOR
TOP
REFRACTORY
Figure 7.11
Vertical
TOP VENT
REAR VENT
NG
LP
NG
LP
4 ft.
1-1
No
Restrictor
No
Restrictor
No
Restrictor
8 ft.
2-2
1-2
1-1
No
Restrictor
15 ft.
3-3
3-2
2-2
1-2
20 ft.
3-3
3-3
3-3
2-3
25 ft.
3-3
3-3
3-3
2-3
30 ft.
3-4
3-3
3-3
3-3
35 ft.
3-4
3-4
3-4
3-3
40 ft.
3-4
3-4
3-4
3-4
50 ft.+
3-4
3-4
3-4
3-4
5. Orientate and align the two pieces of the flue restrictor
as shown in Figure 7.13.
6. Match the amount of vertical you have in the system
with the chart to find the appropriate position to set the
flue restrictor. See Figure 7.12 and 7.13.
7. Center the two flue restrictor pieces on the vent at the
setting selected in step 6 and secure in place by using
two self-tapping screws. See Figure 7.11.
Figure 7.12
Top Vent - Vertical Termination (continued)