Heatilator • Novus NNXT • 4055-879 • Rev E • 5/10
19
D
Clearance to Ceiling
30 in. (762 mm)
0 in.
0 in. TO LEVEL
OF STANDOFFS
Combustible Object
36 in.
(914 mm)
0 in.
Combustible flooring may be installed next
to the front of the appliance.
Drywall
1/2 in.
(13 mm)
1/2 in.
(13 mm)
C
A
B
Model
in.
mm
in.
mm
in.
mm
in.
mm
in.
mm
NNXT3933
39
991
34 7/8
886
19 5/8
498
10
254
9
229
NNXT4236
42
1067
34 7/8
886
19 5/8
498
10
254
9
229
D
Rough Opening
(SLP Pipe)
A
Rough Opening
(Width)
B
Rough Opening
(Height)
D
Rough Opening
(DVP Pipe)
C
Rough Opening
(Depth)
Figure 5.2
Clearances to Combustibles
C. Clearances
NOTICE: Install appliance on hard metal or wood surfaces
extending full width and depth. DO NOT install directly on
carpeting, vinyl, tile or any combustible material other than
wood.
WARNING! Risk of Fire! Maintain specifi ed air space
clearances to appliance and vent pipe:
Note:
If the inside of the framed cavity is to be
fi nished, the framing dimensions
must
include the
fi nished surface. If drywall is to be attached to the
rear wall, the depth must be measured from the
drywall surface.
• Insulation and other materials must be secured to
prevent accidental contact.
• The chase must be properly blocked to prevent blown
insulation or other combustibles from entering and
making contact with fi replace or chimney.
•
Failure to maintain airspace may cause overheating and
a fi re.
