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FLEx VENT INSTALLATION
3. Do not allow the flexible vent to bend in radius tighter than 5" (127 mm). Refer to Figure 30.
4. Horizontal runs of flexible vent shall be supported at maximum 2 foot intervals; vertical runs, five
feet intervals. Metal strapping, properly secured, is an acceptable means to support the flexible
vent.
5. Flexible vent spacers are to be installed at intervals prescribed by the flexible vent manufacturer; and in
such a way as to maintain concentric inner and outer vent spacing.
D. Attaching flexible venting to vertical termination assemblies.
1. When using Simpson pipe, an MHSC flex-to-pipe adapter and/or rigid pipe section(s) is required
to connect the flexible vent assembly to the vertical termination by using three self-penetrating
screws.
2. Review Figure 32 and corresponding instructions for proper overlap, clamp and screw placement.
3. Three each self-penetrating screws are drilled opposite one another and below the gear clamp.
4. Use only listed and approved terminations and accessories, installed per the installation instruc-
tions and Figure 31.
E. Installing flexible venting to horizontal termination assemblies.
1. Connect the 4" flexible vent to the horizontal termination as in Figure 33.
2. Slide termination cap adapter ring over the termination cap's outside pipe and secure with three
screws.
3. Connect the 7" flexible vent to the termination adapter ring as in Figure 33.
4. Review Figure 33 for proper overlap and clamp placement.
5. Three each self-penetrating screws are drilled opposite one another and below the gear lamp.
6. Use only listed an approved terminations and accessories, installed per the termination instructions
and Figure 33.
Flashing
Rigid Pipe
Length
Flex to Pipe
Adapter
(FPA/8)
Firestop
Figure 31 - Typical Vertical Flex Vent
Installation
6
Termination
Cap
Storm Collar
Roof Sup-
port
UL177
Flex PIpe
DVFA/8
Screws
Adapter
(3 Places equidistant
just above gear clamp)
Screws
(3 Places
equidistant
just above
gear clamp)
Gear Clamp
Figure 32 - Typical Pipe Connection
Termination to
Flex Adapter
(FPA/8)
UL177 Flex Vent
Figure 33 - Typical Horizontal Flex Vent Installation
Rigid Pipe Length
Flex to Pipe Adapter
(FPA/8)
Gear Clamp
3
1
/
" Flexible Pipe and
4
Adapter Outer Collar Over-
lap
UL177 Flex Vent
MHSC Horizontal
Vent Termination
3
1
/
" Flexible Pipe and Adapt-
4
er Outer Collar Overlap
Gear Clamp
74D0010
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