Wall Penetration Framing/Firestops - Majestic MER42N Installation Manual

Elbow and Offset Clearances to Combustibles
1 IN. MIN.
ALL SIDES
3 IN. VERTICAL CLEARANCE
HORIZONTAL PIPE SECTIONS
1 IN. MIN.
ALL SIDES
= NO COMBUSTIBLES ALLOWED
IN SHADED AREA
Figure 5.3 Clearances from Vent to Combustible Framing
Materials
Majestic • MER36N, MER36L, MER42N, MER42L Installation Manual • 2595-980 Rev. B • 5/23
1 IN. MIN.
ALL SIDES
1 IN. MIN. HORIZONTAL
CLEARANCE
VERTICAL PIPE SECTIONS
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 VENT FRAMING HOLE WITH INSULATION
OR OTHER MATERIAL.
10 in.
12 in.
10 in.
12 in.
A*
B*
A*
in. 42-3/4
MER36
mm 1086
in. 45-1/8
MER42
mm 1146
* 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.
Note: Center of the horizontal vent pipe to the vertical measuring
surface of a trap cap is 5 inches (127 mm).
Figure 5.4 Wall Penetration
C
D
B* C D
27-7/8 41-3/4 26-7/8
708 1060 683
29-7/8 44-1/8 28-7/8
759 1121 733
45