Majestic • MER36MN, MER42MN Installation Manual • 2599-980 Rev. B • 5/23
50
Important Notice:
Heat shields may
not
be field constructed.
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.
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.
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.
INTERIOR
HEAT SHIELD OR
EXTENDED
HEAT SHIELD
WALL SHIELD
FIRESTOP
HEAT SHIELD
1-1/2 IN. (38 MM) MIN.
OVERLAP
SHEATHING
SLIP SECTION
CAN BE EXTENDED
INNER VENT
OUTER VENT
EXTERIOR
Figure 7.15 Venting Through the Wall
DVP-TRAP1 Exception
See Section 3.C for termination cap exception (DVP-
TRAP1 or equivalent) for top vent, horizontally terminated
installation.
