10
20307394
4" x 6
5
⁄
8
" SLP Termination Kit
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
allowances 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.
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 1
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.
UL1777
Flex Vent
Secure Screws
(3 Places Equidistant
Just Above Gear
Clamp)
Gear Clamps
Flex Adapter
Starter
2" Flexible Pipe
and Adapter Outer
Collar Overlap
Appliance
Starting
Collar
Figure 1 Typical Appliance Connection
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 3
, when
penetrating ceilings, attic spaces, or walls.
3. Do not allow the flexible vent to bend in radius
tighter than 5” (127 mm).
Figure 2
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.
NOTE: 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.
