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Heatilator • NDV30-IFT, NDV33-IFT, NDV36-IFT, NDV36-IFT-NVR, NDV42-IFT Installation Manual • 2620-980 Rev. C • 8/20
Figure 3.8 Clearances to Combustibles
* MINIMUM FRAMING DIMENSIONS
NDV MODEL
(NG/PROPANE)
A
B
C**
D
D
Rough
Opening
(Width)
Rough
Opening
(Height)
Rough
Opening
(Depth)
Rough
Opening
(DVP Pipe)
Rough
Opening
(SLP Pipe)
NDV30-IFT
in.
36
34-7/8
19-5/8
10
9
mm
914
886
498
254
229
NDV33-IFT
in.
39
34-7/8
19-5/8
10
9
mm
991
886
498
254
229
NDV36-IFT
NDV36-IFT-NVR
in.
42
34-7/8
19-5/8
10
9
mm
1067
886
498
254
229
NDV42-IFT
in.
48
34-7/8
19-5/8
10
9
mm
1219
886
498
254
229
* Adjust framing dimensions for interior sheathing (such as sheetrock)
C** Add 11-1/2 inches for rear vented elbow vented directly off the rear of the appliance.
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
Note:
If the inside of the framed cavity is to be
finished, the framing dimensions
must
include the
finished surface. If drywall is to be attached to the
rear wall, the depth must be measured from the
drywall surface.
2 X 4 OR 2 X 6 FRAMING
COMBUSTIBLE
FRAMING
FOR MANTEL AND WALL
PROJECTIONS SEE SECTION 10.B
TOP OF FIREPLACE OPENING
FINISH WALL
COMBUSTIBLE
NO COMBUSTIBLE MATERIALS
IN SHADED AREA.
CLEARANCES TO COMBUSTIBLES:
1 INCH - BOTTOM & SIDES OF VENT PIPE
3 INCHES- TOP OF VENT PIPE
NO COMBUSTIBLE MATERIALS ALLOWED
BELOW TOP OF STANDOFFS.
Elevated Hearth Systems
Some hearth systems will elevate the
appliance off the floor at a given dimen
-
sion. The elevation will also have to be
added to the following: Wall penetration
referenced in Figure 5.2 (Wall penetra-
tion) and Rough Opening Height (header
height) referenced in Figure 3.8. Note:
Finished floor thickness should also be
considered when determining installa-
tion dimensions.