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 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 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 1).
•The inner and outer adaptor 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 adaptor kit does not include individual pipe sections which may be purchased separately. (UL1777 listed type flex venting only.)
DVFA/8 
inner adapter outer adapter
Appliance starting
collar
UL1777
Flex vent
Securing screws
(3 places
equidistant just
above gear
clamp)
Gear clamps
3. Start the flexible vent as follows—
A. Installing the inner flex adaptor and pipe (see Figure 1). 1. Insert the long side of the 4" inner ring inte 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 1¾" overlap.
5.Locate the clamp at approximately ¾" from the flex end and tighten.
6.Secure the clamped inner section with three self tapping screws, drilled equidistance, just above the clamp perimeter.
B.Installing the outer flex pipe (refer to Figure 1).
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 1¾" overlap.
5.Locate the clamp at approximately ¾" 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 UL1777 flex pipe.
1.Always maintain the required clearance when routing the flex vent assembly.
2. Install firestop spacers (see Figure 3) when penetrating ceilings,
attic spaces, or walls. | UL1777 | 5" radius |
|
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.
Flex vent
Figure 2 —
Minimum radius for flex vent section
26 | 54D5031 |