26
20306747
DVM Series Direct Vent Gas Fireplace
FP1974
typical flex install
Termination
Cap
Storm Collar
Roof Sup-
port
Flashing
Rigid Pipe
Length
Flex to Pipe
Adapter
Firestop
UL1777 Flex
PIpe
Figure 38 -
Typical Vertical Flex Vent Installation
FP1975
pipe connection
Screws
(3 Places
equidistant
just above
gear clamp)
Rigid Pipe Length
Flex to Pipe Adapter
Gear Clamp
1
3
⁄
4
" Flexible Pipe and
Adapter Outer Collar Over-
lap
UL1777 Flex Vent
Figure 39 -
Typical Pipe Connection
Gear Clamp
FP1976
horizontal flex
Screws
(3 Places equidistant
just above gear clamp)
Gear Clamp
UL1777 Flex Vent
1
3
⁄
4
" Flexible Pipe
and Collar Overlap
Vermont Castings
Group Horizontal
Vent Termination
Figure 40 -
Typical Horizontal Flex Vent Installation
DVFF8A/8 5" x 8"
to 5" x 8" Adapter
FP1974
FLEX VENTING INSTALLATION
C. Routing UL1777 flex pipe.
1. Always maintain the required clearance when
routing the flex vent assembly.
2. Install firestop spacers,
Figure 38
, when penetrat-
ing ceiling, attic spaces, or walls.
3. Do not allow the flexible vent to bend in radius
tighter than 5" (127 mm).
Figure 37
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 inter-
vals 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 5 x 8 flex pipe, a Vermont Castings
Group 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 39
and corresponding instruc-
tions for proper overlap, clamp and screw place-
ment.
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 38
.
E. Installing flexible venting to horizontal termination
assemblies.
1. Connect the 5" flexible vent to the horizontal
termination as in
Figure 40
.
2. Connect the 8" flexible vent to the termination
ring as in
Figure 40
.
3. Review
Figure 40
for proper overlap and clamp
placement.
4. Three each self-penetrating screws are drilled
opposite one another and below the gear lamp.
5. Use only listed an approved terminations and
accessories, installed per the termination instruc-
tions and
Figure 40
.
