MHSC CDVR33 - Flex Vent Installation

69D0023 27
CDV Series 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 allowances that per-
 Flex
kits may not be modied. Flex kits may be added to the
end of a vent run made of rigid vent sections using pipe
manufacturer's approved ex to pipe adapters. This
may occur only if doing so does not violate any
of the venting length, height, routing, horizon-
tal to vertical ratio requirements or clearance
considerations detailed in this manual.
2. The ex adapter starter kit (DVFA/8) is used
to attach ex venting to the appliance starting
collar. It includes 4" inner and 7" outer adapter
rings. Figure 35
• The inner and outer adapter rings are required to
start all ex runs.
• Never install damaged or torn exible venting.
• Over tightening clamps may rip, tear, or otherwise
damage 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 exible vent as follows:
A. Installing the inner ex adapter and pipe. Figure 35
1. Insert the long side of the 4" inner ring into exhaust pipe, gently tap to seat into place,
and secure with screws.
2. Slide the small gear clamp over the inner exible vent pipe, and push out
of the way.
3. Pull and extend the inner 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 ex end and tighten.
6. Secure the clamped inner section with three (3) self-tapping screws, drilled
equidistant, just above the clamp perimeter.
B. Installing the outer ex pipe. Figure 36
1. Firmly insert the outer adapter ring into the outer appliance starting collar
and secure with screws.
2. Slide the large gear clamp over the outer exible vent pipe, and push out
of the way.
3. Pull and extend the outer 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 ex end and tighten.
6. Secure the clamped outer section with three (3) self-tapping screws, drilled equidis-
tant, just above the clamp perimeter.
FP1972
appliance connection
UL1777 Flex
Vent
Gear
Clamp
Secure with
Three (3) Screws,
Placed Equidis-
tant Just Above
Gear Clamp
Appliance Starting
Collar
DVFA/8
Inner Adapter
Outer Adapter
1
3
/4" Flex-
ible Pipe and
Adapter Outer
FP1972
Figure 35 -
Typical Appliance Connection
FP1973
flex pipe bend
UL1777 Flex
Vent
5° Radius
FP1973
Figure 36 -
Maximum Radius for
Flex Vent Section
NOTE
Flex vent pipe spacers: Refer to manufacturer's specic-
aionts for correct positioning of the spacer springs to main-
tain proper distance between inside and outside pipe.