Vertical Through-The-Roof Installation - Vermont Castings 33CFDVNV Installation And Operating Instructions Manual

CFDV Series Gas Fireplace
1 + 2 + 3 + 4 = 270°
1
2
3
4
Figure 52 –
Maximum Elbow Usage
VERTICAL THROUGH-ROOF
FLEX VENTING
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.
2. The flex adapter starter is used to attach flex venting to
the appliance starting collar. It includes a 4" inner and
6-5/8" outer unitized flex adapter starter. Figure 1
• The flex adapter starter is 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 adaptor kit does not include individual flex
pipe sections which may be purchased separately.
(UL1777 listed type venting only.)
3. Start the flexible vent as follows—
A. Installing the inner flex adaptor and pipe. Figure 1
1. Attach the flex adapter starter onto the starting
collar on the unit. Align seam of the pipe and
seam of collar to allow engagement. Rotate the
flex starter to lock onto appliance. Install three (3)
self tapping #10 screws through the flex starter
into the starting collar of the appliance.
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 2" overlap.
28
1
2
3
4
FP1179
UL1777
Flex Vent
2" Flexible Pipe
and Adapter Outer
Collar Overlap
Flex Adapter
Starter
Appliance
Starting
Collar
Figure 53 –
Typical Appliance Connection
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 53
1. Slide the large gear clamp over the outer flexible
vent pipe, and push out of the way.
2. Pull and extend the outer flexible vent.
3. Slide the outer vent onto the appliance collar outer
adapter for a minimum 2" overlap.
4. Locate the clamp at approximately 3/4" from the
flex end and tighten.
5. 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 55, when pene-
trating ceilings, attic spaces, or walls.
3. Do not allow the flexible vent to bend in radius
tighter than 5" (127 mm). Figure 54
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 intervals
prescribed by the flexible vent manufacture; and
in such a way as to maintain concentric inner and
outer vent spacing.
VENTING INSTALLATION
Secure Screws
(3 Places Equidistant
Just Above Gear
Clamp)
Gear Clamps
20306739