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B. Wall Penetration Framing/Firestops
Combustible Wall Penetration
Whenever a combustible wall is penetrated, you must
frame a hole for the wall shield firestop(s). The wall shield
firestop maintains minimum clearances and prevents cold
air infiltration.
• The opening must be framed on all four sides using the
same size framing materials as those used in the wall
construction.
• SLP pipe - A wall shield firestop must be placed on each
side of an interior wall. A minimum 1-1/2 in. (38 mm)
overlap of attached heat shields must be maintained.
• DVP pipe - A wall shield firestop is required on one side
only on interior walls. If your local inspector requires a
wall shield firestop on both sides, then both wall shield
firestops must have a heat shield (refer to Section
12.A.) attached to them.
• See Section 7.F. for information for regarding the instal-
lation of a horizontal termination cap.
Non-Combustible Wall Penetration
If the hole being penetrated is surrounded by non-com-
bustible materials such as concrete, a hole with diameter
one inch greater than the pipe is acceptable.
Whenever a non-combustible wall is penetrated, the wall
shield firestop is only required on one side and no heat
shield is necessary.
DO NOT PACK HOLE WITH INSULATION
OR OTHER MATERIAL
10 in.
10 in.
A*
B*
in.
42-3/4
CNXT4236
mm
in.
45-1/8
CNXT4842
mm
* Shows center of vent framing hole for top or rear venting. The
center of the hole is one (1) in. (25 mm) above the center of
the horizontal vent pipe.
Figure 5.3 Wall Penetration
12 in.
C
D
12 in.
A*
B*
C
27-7/8
41-3/4
1086
708
1060
29-7/8
44-1/8
1146
759
1121
Heatilator • CNXT4236IFT, CNXT4842IFT Installation Manual • 2515-980 Rev. R • 1/23
D
26-7/8
683
28-7/8
733
37
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