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F. Use of Flex Vent
The flex vent must be supported with the spacing between
support intervals not exceeding 4 feet, with no more than
½ 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 4.9) requires only enough sup-
port to maintain the necessary clearance to combustibles.
However, the vent attachment point and the firestop loca-
tion are considered to be supports.
3 in. CLEARANCE
FLEX-VENT
Figure 4.9
TERMINATION
CAP
1 in.
CLEARANCE
Heat & Glo • SL-5F, SL-7F Installation Manual • 2499-980 Rev. L • 10/19
G. Vent Diagrams
To replace the first 90º starter elbow with two 45º elbows,
refer to Figure 4.7. All other 90º elbows can be replaced
with two 45º elbows.
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.
• Elbows may be placed back to back anywhere in the
system as long as the first 90º elbow is a starter elbow
except as shown in Figure 4.10.
• 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.
• Horizontal termination cap should have a 1/4 inch
downward slant to allow any moisture in cap to be
released. See Figure 4.10.
Top Vent—Horizontal Termination—Two 45º Elbows
Installation requirements to replace the first 90º elbow
with two 45º elbows:
1/4 in. max.
(6 mm)
Figure 4.10
4 ft min.
(1.22 m)
25 ft max.
(7.62 m)
17
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