Heatilator • NNXT4236IF, NNXT4236ILF, NNXT3633IF, NNXT3633ILF Installation Manual • 4055-980 Rev. D • 9/15
8
In addition to these framing dimensions, also reference
the following sections:
• Clearances and Mantel Projections
• Vent Clearances and Framing
Rear vent
One 45° elbow
Horiz Term
Rear Vent
Two 90° elbows
Horiz Term
Rear Vent
One 90° elbow
Vert Term
Top Vent
One 90° elbow
Horiz Term
No elbows
Horiz Term
A
A
A
A
A
A
C
B
B
E
F
D
1/2 in. (13 mm) min.
appliance to
combustibles
D
F
1 in. (25 mm)
min. pipe to
combustibles
E
1/2 in. (13 mm)
min. appliance
to combustibles
Alcove
Installation
C
1 in. (25 mm)
min. pipe to
combustibles
G
Drywall
48 in.
(1219 mm)
maximum
H
I
J
K
* As B increases, L increases accordingly.
L
*
B. Clearances to Combustibles
When selecting a location for the appliance it is important
to consider the required clearances to walls (see Figure
3.2).
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 traf
fi
c and away from furniture and draperies.
NOTICE:
Illustrations re
fl
ect typical installations and are
FOR DESIGN PURPOSES ONLY. Illustrations/diagrams
are not drawn to scale. Actual installation may vary due to
individual design preference.
Figure 3.2 Appliance Locations
A
B
C
D
E
F
G
H
I
J
K
L
NNXT3933
in
39
35-1/2
19-5/8
43-3/8
47
53-1/4
40
50-1/4
61-3/8
66-1/2
75-3/8
9-1/2
mm
991
902
498
1102
1194
1353
1016
1276
1559
1689
1915
241
NNXT4236
in
42
37-5/8
19-5/8
43-3/8
47
53-1/4
43
53-1/4
61-3/8
66-1/2
75-3/8
10-5/8
mm
1067
956
498
1102
1194
1353
1092
1330
1559
1689
1915
270
