Wall Penetration Framing/Firestops - Heatilator NDV3630I-B Installation Manual

B. Wall Penetration Framing/Firestops
Combustible Wall Penetration
Whenever a combustible wall is penetrated, you must
frame a hole for the wall shield fi restop(s). The wall shield
fi restop maintains minimum clearances and prevents cold
air infi ltration.
• 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 fi restop 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 fi restop is required on one side
only on interior walls. If your local inspector requires a
wall shield fi restop on both sides, then both wall shield
fi restops 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 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.
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Heatilator • NDV3630I-B, NDV3933I-B, NDV4236I-B, NDV4842I-B Installation Manual • 2382-980 Rev. G • 4/16
DO NOT PACK WITH
INSULATION OR
OTHER MATERIAL
10 in.
12 in. (DVP)
10 in. (SLP)
A*
B*
A*
Inches 40-1/2
* Shows center of vent framing hole for top or rear venting. The center of the
hole is one (1) in. (25.4 mm) above the center of the horizontal vent pipe.
Figure 5.2 Wall Penetration
C
D
B* C D
24-1/2 39-1/2 23-1/2