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Heatilator • Novus NDV Series • 4055-187 Rev F • 06/08 33
*When using SLP pipe, minimum clearances from the vent pipe to combus-
tible materials at inside wall firestops are: Top: 2-1/2 in. (64 mm)
Bottom: 1/2 in. (13 mm)
Sides: 1 in. (25 mm)
Note: Heat shields MUST overlap by a minimum of 1-1/2 in. (38 mm).
• DVP heat shield - designed to be used on a wall 4 in. to 7-1/4 in. (102 mm to
184 mm) thick.
• If wall thickness is less than 4 in. the existing heat shields must be field trimmed.
If wall thickness is greater than 7-1/4 in. a DVP-HSM-B will be required.
• SLP heat shield - designed to be used on a wall 4-3/8 in. to 7-5/8 in. (111 mm
to 194 mm thick).
• If wall thickness is less than 4-3/8 the existing heat shields must be field
trimmed. If wall thickness is greater than 7-5/8 in. a DVP-HSM-B will be
required.
(DVP-SLP Pipe Shown)
3 in. (76 mm)
top clearance *
1 in. (25 mm)
clearance
bottom & sides
Heat
Shield
Wall
Shield
Firestop
Heat
Shield
WALL
3 in. (76 mm)
top clearance *
1 in. (25 mm)
clearance
bottom & sides
Heat
Shield
Wall
Shield
Firestop
Heat
Shield
WALL
3 in. (76 mm)
top clearance
1 in. (25 mm)
clearance around
vertical sections
B*
Framing should be
constructed of 2 X 4
lumber or heavier.
The center of the
framing hole is
1 in. (25mm) above
the center of the
horizontal vent pipe.
A*
Vent framing hole.
DO NOT PACK WITH
INSULATION OR
OTHER MATERIAL.
* To center of pipe.
10 in.
12 in.
A. Pipe Clearances to Combustibles
WARNING! Risk of Fire! Maintain air space clearance to
vent. DO NOT pack insulation or other combustibles:
• Between ceiling fi restops
• Between wall shield fi restops
• Around vent system
Failure to keep insulation or other material away from
vent pipe may cause over heating and fi re.
8
8
Vent Clearances and Framing
B. Wall Penetration Framing
Combustible Wall Penetration
Frame a hole in a combustible wall for an interior wall shield
fi restop, (Figure 8.2) whenever a wall is penetrated.
The opening must be framed on all four sides using the same
size framing materials as those used in the wall construction.
The wall shield fi restop maintains minimum clearances and
prevents cold air infi ltration.
Non-Combustible Wall Penetration
If the hole being penetrated is surrounded by noncombus-
tible materials such as concrete, a hole with diameter 1 in.
greater than the pipe is acceptable.
Whenever a non-combustible wall is penetrated, the wall
shield fi restop is only required on one side and no heat
shield is necessary.
If your local inspector requires the wall shield fi restop on
both sides, then both wall shield fi restops must have a heat
shield attached to them.
Figure 8.2 Wall Penetration DVP only
Figure 8.1 Pipe Clearances
Model
A
Top Vent
B
Rear Vent
NDV3630
NDV3933
NDV4236
NDV4842
in. 39-1/2 23-1/2
mm 1003 597