28
20306750
Designer Series Direct Vent Gas Fireplace
FLEX VENT INSTALLATION
1. Flexible UL1777 listed venting may be used in any
venting application where rigid direct vent components
can be used.
All restrictions, clearances and allow
-
ances that pertain to the rigid piping apply to the
flexible venting.
Flex kits may not be modified. Flex
kits may be added to the end of a vent run made of rigid
vent sections using pipe manufacturer's approved flex
to pipe adapters. This may occur only if doing so does
not violate any of the venting length, height, routing,
horizontal to vertical ratio requirements or clearance
considerations detailed in this manual.
5" x 8" Flex Vent Pipe
2. The flex adapter starter kit (DVFF8A/8) is used to attach
flex venting to the appliance starting collar. It includes
5" inner and 8" outer adapter rings.
Figure 41
•
The inner and outer adapter rings are required to
start all flex runs.
•
Never install damaged or torn flexible venting.
•
Over tightening clamps may rip, tear, or otherwise
damage flexible venting.
•
The adapter kit does not include individual pipe sec-
tions which may be purchased separately. (UL1777
listed type venting only.)
3. Start the flexible vent as follows:
A. Installing the inner flex adapter and pipe.
Figure 41
FP1972
appliance connection
UL1777
Flex Vent
Screws
(3 places,
equidistant just
above gear
clamp)
1
3
⁄
4
" Flexible
Pipe and
Adapter
Outer
DVFF8A/8
Inner Adapter
Outer Adapter
Appliance
Starting Collar
Figure 41 -
Typical 5" x 8" Appliance Connection
1. Insert the long side of the 5" inner ring into exhaust
pipe, gently tap to seat into place, and secure with
screws.
2. Slide the small gear clamp over the inner flexible
vent pipe, and push out of the way.
3. Pull and extend the inner flexible vent.
4. Slide the inner vent onto the adapter collar, for a
minimum 1
3
⁄
4
" overlap.
5. Locate the clamp at approximately 3/4" from the flex
end and tighten.
6. Secure the clamped inner section with three self-
tapping screws, drilled equidistant, just above the
clamp perimeter.
B. Installing the outer flex pipe.
Figure 41
1. Firmly insert the 8" outer adapter ring into the
outer appliance starting collar and secure with
screws.
2. Slide the large gear clamp over the outer flexible
vent pipe, and push out of the way.
3. Pull and extend the outer flexible vent.
4. Slide the outer vent onto the appliance collar outer
adapter for a minimum 1
3
⁄
4
" overlap.
5. Locate the clamp at approximately 3/4" from the
flex end and tighten.
6. Secure the clamped outer section with three self-
tapping screws, drilled equidistant, just above the
clamp perimeter.
C. Routing UL1777 flex pipe.
1. Always maintain the required clearance when
routing the flex vent assembly.
2. Install firestop spacers,
Figure 43
, 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 42
4. Horizontal runs of flexible vent shall be supported
at maximum 2
foot intervals;
vertical runs,
five feet inter-
v a l s . M e t a l
strapping, prop-
erly secured, is
an acceptable
means to sup-
port 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.
FP1973
flex pipe bend
UL1777
Flex Vent
5° Radius
Figure 42 -
Minimum Radius for Flex
Vent Section
Flex vent pipe spacers: Refer to manufacturer’s
specifications for correct positioning of the
spacer springs to maintain proper distance
between inside and outside pipe.
NOTE
VENTING INSTALLATION
