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B.
Appliance Location and
Combustibles
When selecting a location for the appliance it is important
to consider the required clearances to walls and allow suf-
ficient clearance for heat management systems venting.
See Figure 3.5 and Figure 3.6.
WARNING! Risk of Fire or Burns! Provide adequate
clearance around air openings and for service access.
Due to high temperatures, the appliance should be lo-
cated out of traffic and away from furniture and draperies.
NOTICE: Illustrations reflect typical installations and are
FOR DESIGN PURPOSES ONLY. Illustrations/diagrams
are not drawn to scale. Actual installation may vary due to
individual design preference.
* As B increases, J increases accordingly.
1/2 in. (13 mm)
min. appliance
to combustibles
B
D
1 in. (25 mm)
min. pipe to
combustibles
NNXT33-IFT
NNXT36-IFT
Figure 3.6 Appliance Locations
12
Heatilator • NNXT33-IFT, NNXT33L-IFT, NNXT36-IFT, NNXT36L-IFT Installation Manual • 2628-980 Rev. C • 8/20
Clearances to
J*
B
Drywall
A
G
Top Vent
One 90° elbow
Horiz Term
In addition to these framing dimensions, also reference
the following sections:
• Clearances and Mantel Projections
• Vent Clearances and Framing
Rear Vent
One 90° elbow
Vert Term
H
A
D
A
B
in
39
35-1/2
mm
991
902
in
42
37-5/8
mm
1067
956
NOTICE: Allow 18 inches minimum clearance
on side(s) of appliance for venting of heat
management system.
Figure 3.5 Clearance for Heat Management System
A
F
Alcove
Installation
A
C
D
E
19-5/8
47
53-1/4
498
1194
1353
1016
19-5/8
47
53-1/4
498
1194
1353
1092
18 IN. MIN.
C
48 in.
(1219 mm)
maximum
Rear Vent
Two 90° elbows
Horiz Term
I
A
C
E
F
G
H
40
50-1/4
66-1/2
75-3/8
1276
1689
1915
43
53-1/4
66-1/2
75-3/8
1353
1689
1915
E
I
J
9-1/2
241
10-5/8
270
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