Use Of Flex Vent; Vent Diagrams - Majestic fireplaces QUARTZ32IN Installation Manual

F. Use of Flex Vent
The fl ex vent must be supported with the spacing between
support intervals not exceeding 4 feet, with no more than
1/2 inch sag between supports.
A support is required at each change in venting direction,
and in any location where it is necessary to maintain the
necessary clearance to combustibles. A simple "up and
out" installation (Figure 4.8) requires only enough support
to maintain the necessary clearance to combustibles.
However, the vent attachment point and the fi restop loca-
tion are considered to be supports.
3 in. CLEARANCE
FLEX-VENT
Figure 4.8 Flex Vent Pipe - Generic Fireplace Shown
18
TERMINATION
CAP
1 in.
CLEARANCE
Majestic • QUARTZ32, QUARTZ36 Installation Manual • 2412-980 Rev. H • 10/16
G. Vent Diagrams
General Rules:
• 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.
• Rear Vented: A maximum of three 90º elbows (or six 45º
elbows) may be used in any vent confi guration. Some
elbows may be installed horizontally. See Figure 4.23
and 4.24.
• Top Vented: A maximum of four 90º elbows (or eight 45º
elbows) may be used in any vent confi guration. Some
elbows may be installed horizontally. See Figure 4.16
and 4.17.
• Elbows may be placed back to back anywhere in the
system.
•
Any 90º elbow may be replaced with two back to back
45º elbows.
• When penetrating a combustible wall, a wall shield
fi restop must be installed.
• When penetrating a combustible ceiling, a ceiling fi restop
must be installed.
• Horizontal runs of vent do not require vertical rise;
horizontal runs may be level.
• Horizontal termination cap should have a 1/4 inch
downward slant to allow any moisture in cap to be
released. See Figure 4.9.
1/4 in. max.
(6 mm)
Figure 4.9 Vent Cap - Generic Fireplace Shown