Majestic • MER36MN, MER42MN Installation Manual • 2599-980 Rev. B • 5/23
30
E. Vent Diagrams
WARNING
Fire Risk. Explosion Risk.
Do NOT pack insulation or other combustibles
between ceiling firestops.
• ALWAYS maintain specified clearances around
venting and firestop systems.
• Install wall shield and ceiling firestops as speci
-
fied.
Failure to keep insulation or other material away
from vent pipe may cause fire.
WARNING
Fire Risk.
• When using DVP-HRC-SS and DVP-HRC-ZC-
SS termination caps on top vented fireplaces, a
6 inch minimum vertical vent section is required
before installing first elbow.
Example:
DVP pipe 3 ft. min. vertical = 11 ft. max. horizontal
SLP pipe 7 ft. min. vertical = 11 ft. max. horizontal
1/4 in. max.
(6 mm)
Figure 4.8
General Rules:
• When penetrating a combustible wall, a wall shield
firestop must be installed.
• When penetrating a combustible ceiling, a ceiling firestop
must be installed.
• Horizontal runs of vent do not require vertical rise;
horizontal runs may be level.
• It is recommended that the horizontal termination cap
have a 1/4 inch downward slant to allow any moisture
in cap to be released. See Figure 4.8.
If venting configuration differs from the vent diagrams on
the following pages (Figure 4.11-4.18), these rules also
apply:
• SUBTRACT 3 ft from the total H measurement for
each 90º elbow installed horizontally.
• SUBTRACT 1-1/2 ft from the total H measurement
for each 45º elbow installed horizontally.
• A maximum of three 90º elbows (or six 45º elbows)
may be used in any vent configuration. Some elbows
may be installed horizontally. See Figure 4.18.
• Elbows may be placed back to back anywhere in
the system.
•
Any 90º elbow may be replaced with two back to
back 45º elbows.
•
2 x 45° elbow jog directly off the top of the fireplace
is allowed but has no V or H value, is permitted
when reducing to SLP pipe, and DOES NOT count
towards total elbow count.
Note: The
MER36MN / MER42MN
models can adapt
to SLP series vent pipe, if desired.
A DVP-2SL adapter and a minimum 48 inch vertical section
of SLP series vent pipe must be used.
A DVP-SLP24 adapter may also be used with a 24 inch
vertical section of SLP series vent pipe.
After
the 48 inch vertical section, the venting table rules
must be followed. The first 48 inch
vertical
section is NOT
counted as part of the vertical components in the table. It is
still counted as part of the overall maximum run. All venting
table rules for the vent run must still be followed.
