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F. Horizontal Termination Requirements
Heat Shield Requirements for Horizontal
Termination
WARNING! Risk of Fire! To prevent overheating and fire,
heat shields must extend through the entire wall thick-
ness.
• DO NOT remove the heat shields attached to the
wall shield firestop and the horizontal termination cap
(shown in Figure 7.15).
• Heat shields must overlap 1-1/2 in. (38 mm) mini-
mum.
There are two sections of the heat shield. One section
is factory-attached to the wall shield firestop. The other
section is factory-attached to the cap. See Figure 7.15.
If the wall thickness does not allow the required 1-1/2 in.
(38 mm) heat shield overlap when installed, an extended
heat shield must be used.
• If the wall thickness is less than 4 in./102 mm (DVP)
or 4-3/8 in./ 111 mm (SLP), the heat shields on the cap
and wall shield firestop must be trimmed. A minimum
1-1/2 in. (38 mm) overlap MUST be maintained.
• Use an extended heat shield if the finished wall thickness
is greater than 7-1/4 in. (184 mm).
• The extended heat shield may need to be cut to length
maintaining sufficient length for a 1-1/2 in. (38 mm)
overlap between heat shields.
• Attach the extended heat shield to either of the
existing heat shields using the screws supplied with
the extended heat shield. Refer to Vent Components
document included in manual bag.
• Rest the small leg on the extended heat shield on top
of the pipe section to properly space it from the pipe
section.
Important Notice: Heat shields may not be field constructed.
Majestic • MER36N, MER36L, MER42N, MER42L Installation Manual • 2595-980 Rev. B • 5/23
56
Install Horizontal Termination Cap (DVP and
SLP Pipe)
WARNING! Risk of Fire! The telescoping flue section of
the termination cap MUST be used when connecting vent.
• 1-1/2 (38 mm) minimum overlap of flue telescoping
section is required.
Failure to maintain overlap could cause overheating and
fire.
• Vent termination must not be recessed in the wall. Siding
may be brought to the edge of the cap base.
• Flash and seal as appropriate for siding material at
outside edges of cap.
• When installing a horizontal termination cap, follow
the cap location guidelines as prescribed by current
ANSI Z223.1 and CAN/CGA-B149 installation codes
and refer to Section 4 of this manual.
CAUTION! Risk of Burns! Local codes may require in-
stallation of a cap shield to prevent anything or anyone
from touching the hot cap.
NOTICE: For certain exposures which require superior
resistance to wind-driven rain penetration, a flashing kit
and HRC caps are available. When penetrating a brick
wall, a brick extension kit is available for framing the brick.
Note: When using termination caps with factory-supplied
heat shield attached, no additional wall shield firestop is
required on the exterior side of a combustible wall.
DVP-TRAP1 Exception
See Section 3.C for DVP-TRAP1 exception for top vent,
horizontally terminated installation.
WALL SHIELD
FIRESTOP
INNER VENT
OUTER VENT
Figure 7.15 Venting Through the Wall
HEAT SHIELD OR
HEAT SHIELD
EXTENDED
1-1/2 IN. (38 MM) MIN.
HEAT SHIELD
OVERLAP
SLIP SECTION
CAN BE EXTENDED
SHEATHING
INTERIOR
EXTERIOR
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