74D0009
5
FLEx VENT INSTALLATION
1. Flexible UL1777 listed venting may be used in any venting application where rigid direct vent compo-
nents 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 vent-
ing length, height, routing, horizontal to vertical ratio
requirements or clearance considerations 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.
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 other-
wise damage flexible venting.
•
The adapter kit does not include individual pipe
sections which may be purchased separately.
(UL1777 listed type venting only.)
3. Start the flexible vent as follows:
A. Installing the inner flex adapter and pipe.
Figure
29
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.
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
minimum 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.
UL1777
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
UL1777
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.
Summary of Contents for Direct Vent BLDV400
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