DVB Series Direct Vent Gas Fireplace
54D0701
3
Flex VeNtING INstAllAtIoN
1. Flexible UL1777 listed venting may be used in any
venting application where rigid direct vent compo-
nents can be used.
All restrictions, clearances and
allowances that pertain to the rigid piping apply
to the flexible venting.
Flex kits may not be modi-
fied. 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 require-
ments or clearance considerations detailed in this
manual.
. The flex adapter starter kit (DVFA/8) is used to attach
flex venting to the appliance starting collar. It includes
4" inner and 7" outer adapter rings.
Figure 34
•
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
sections which may be purchased separately.
(UL1777 listed type venting only.)
FP1972
appliance connection
UL1777 Flex
Vent
1
C\v
” Flexible
Pipe and
Adapter
Outer
DVFA/8
Inner Adapter
Outer Adapter
Appliance Starting
Collar
Securing
Screws (3
places, equi-
distant just
above gear
clamp)
FP197
Figure 34 -
Typical Appliance Connection
FP1973
flex pipe bend
UL1777
Flex Vent
5° Radius
FP1973
Figure 35 -
Minimum Radius for Flex Vent
Section
N
ote
F l e x v e n t p i p e s p a c e r s : R e f e r t o
manufacturer’s specifications for correct
positioning of the spacer springs to
maintain proper distance between inside
and outside pipe.
3. Start the flexible vent as follows:
A. Installing the inner flex adapter and pipe.
Figure
34
1. Insert the long side of the 4" inner ring into
exhaust pipe, gently tap to seat into place, and
secure with screws.
. Slide the small gear clamp over the inner flex-
ible 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
C\v
" 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 34
1. Firmly insert the outer adapter ring into the
outer appliance starting collar and secure with
screws.
. Slide the large gear clamp over the outer flex-
ible 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
C\v
" 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.
. Install firestop spacers (
Figure 36
) when penetrat-
ing ceiling, attic spaces, or walls.
3. Do not allow the flexible vent to bend in radius
tighter than 5" (17 mm).
Figure 35
4. Horizontal runs of flexible vent shall be sup-
ported at maximum
foot intervals; vertical
runs, five feet intervals.
Metal strapping, properly
secured, is an acceptable
means to support the
flexible vent.
