74D0010
5
FLEx VENT INSTALLATION
1. Flexible UL177 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 manufactur
-
er'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 consid
-
erations detailed in this manual.
2. 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. (
Refer to Figure 29
)
• 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 sec
-
tions which may be purchased separately. (UL177
listed type venting only.)
3. Start the flexible vent as follows:
A. Installing the inner flex adapter and pipe. See Figure
1.
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 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 1
3
/
4
" 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.
See Figure 29
.
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 flexible 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 mini
-
mum 1
3
/
4
" 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 UL177 flex pipe.
1. Always maintain the required clearance when routing the flex vent
assembly.
2. Install firestop spacers (
See Figure 31
) when penetrating ceiling, attic
spaces, or walls.
UL177
Flex Vent
Securing
Screws (3
places, equi-
distant just
above gear
clamp)
1
3
/
4
" Flex
-
ible Pipe
and Adapter
Outer
DVFA/8
Inner Adapter
Outer Adapter
Appliance
Starting
Collar
Figure 29 - Typical Appliance Connec-
tion
UL177
Flex Vent
5
°
Radius
Figure 30 - Minimum Radius
for Flex Vent Section
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.
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