20306748
23
MLDV Series Gas Fireplace
A. Installing the inner
fl
ex adapter and pipe.
Figure 36
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
fl
exible
vent pipe, and push out of the way.
3. Pull and extend the inner
fl
exible 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
fl
ex 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
fl
ex pipe.
Figure 36
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
fl
exible
vent pipe, and push out of the way.
3. Pull and extend the outer
fl
exible 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
fl
ex end and tighten.
6. Secure the clamped outer section with three
self-tapping screws, drilled equidistant, just above
the clamp perimeter.
C. Routing UL1777
fl
ex pipe.
1. Always maintain the required clearance when
routing the
fl
ex vent assembly.
2. Install
fi
restop spacers,
Figure 38
, when pene-
trating ceiling, attic spaces, or walls.
3. Do not allow the
fl
exible vent to bend in radius
t i g h t e r t h a n
5" (127 mm).
Figure 37
4. Horizontal runs
of
fl
exible vent
shall be sup-
ported at max-
imum 2 foot
intervals; ver-
tical runs,
fi
ve
feet intervals.
Metal strap-
ping, properly
secured, is an
a c c e p t a b l e
means to support the
fl
exible vent.
5. Flexible vent spacers are to be installed at inter-
vals prescribed by the
fl
exible vent manufacturer;
and in such a way as to maintain concentric inner
and outer vent spacing.
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
fl
exible venting.
Flex kits may not be modi
fi
ed. Flex
kits may be added to the end of a vent run made of rigid
vent sections using pipe manufacturer's approved
fl
ex
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
fl
ex adapter starter kit (DVFF8A/8) is used to attach
fl
ex venting to the appliance starting collar. It includes
5" inner and 8" outer adapter rings.
Figure 36
•
The inner and outer adapter rings are required to
start all
fl
ex runs.
•
Never install damaged or torn
fl
exible venting.
•
Over tightening clamps may rip, tear, or otherwise
damage
fl
exible venting.
•
The adapter kit does not include individual pipe sec-
tions which may be purchased separately. (UL1777
listed type venting only.)
3. Start the
fl
exible vent as follows:
VENTING INSTALLATION
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 36 -
Typical Appliance Connection
FP1972
UL1777
Flex Vent
5° Radius
Figure 37 -
Minimum Radius for Flex
Vent Section
FP1973
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 speci
fi
cations for correct
positioning of the spacer springs to
maintain proper distance between inside
and outside pipe.
NOTE
Pipe
Clamps
