6
74D0009
FLEx VENT INSTALLATION
C. Routing UL1777 flex pipe.
1. Always maintain the required clearance when routing the flex vent assembly.
2. Install firestop spacers (
Figure 31
) when penetrating ceiling, attic spaces, or walls.
3. Do not allow the flexible vent to bend in radius tighter than 5" (127 mm).
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 con-
nect 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 instructions and
Figure 31
.
E. Installing flexible venting to horizontal termination assemblies.
1. Connect the 4" flexible vent to the horizontal termination.
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.
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
.
Termination
Cap
Storm Collar
Roof Sup-
port
Flashing
Rigid Pipe
Length
Flex to Pipe
Adapter
(FPA/8)
Firestop
UL1777 Flex
PIpe
DVFA/8
Adapter
Figure 31 - Typical Vertical Flex Vent
Installation
Screws
(3 Places
equidistant
just above
gear clamp)
Rigid Pipe Length
Flex to Pipe Adapter
(FPA/8)
Gear Clamp
1
3
/
4
" Flexible Pipe and
Adapter Outer Collar Over-
lap
UL1777 Flex Vent
Figure 32 - Typical Pipe Connection
Gear Clamp
Screws
(3 Places equidistant
just above gear clamp)
Gear Clamp
UL1777 Flex Vent
1
3
/
4
" Flexible Pipe and Adapt-
er Outer Collar Overlap
MHSC Horizontal
Vent Termination
Termination to
Flex Adapter
(FPA/8)
Figure 33 - Typical Horizontal Flex Vent Installation
Summary of Contents for Direct Vent BLDV400
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