29
Majestic • MERC32IN, MERC32IL, MERC32VN, MERC32VL Installation Manual • 2401-980 Rev. C • 11/16
Figure 5.2 Wall Penetration
* 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.
A*
B*
C
D
MERC32
in.
37
24-3/8
36
23-3/8
mm
940
619
914
594
W
w
m
C
D
B*
A*
10 in.
12 in.
10 in.
10 in.
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 in
fi
ltration.
These clearances are maintained by using an SLP-WS
(SLP pipe) or DVP-WS (DVP pipe). See Figure 5.2 for
framing instructions.
• For external walls: The wall shield
fi
restop is included
with the termination cap assembly.
• For internal walls: A wall shield
fi
restop must be pur-
chased and installed.
• 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 main-
tained.
• DVP pipe - A wall shield
fi
restop is required on one
side only on interior walls. If your local inspector re-
quires 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 in-
stallation 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.
