Lennox Hearth LMDV-4035-CNM, LMDVT-3328-CPM Install the Outer Flex Pipe, Flexible Vent Section

Vertical or Horizontal Venting Using Secure Flex Kits and Components

Secure Flex venting kits and components may be used in any venting application in place of rigid Secure Vent (SV4.5) direct vent components. All restrictions, clearances and allowances that pertain to the rigid piping apply to the flexible venting. Secure Flex kits may not be modified; also, under no circumstances may separate sections of flex pipe be joined together.

Using adapter (SV4.5RF), Secure Flex kits may be added to the end of a vent run made up of rigid Secure Vent (SV4.5) vent sections provided that doing so does not violate any of the venting length, height, routing, horizontal to vertical ratio requirements or clearance considerations detailed in this manual.

Secure Flex kits come with an adapter that can be fitted to the inclined channel end of the last Secure Vent (SV4.5) vent section in a rigid system in the exact same fashion as any other Secure Vent section. Align the dimpled

Note: Outer Pipe Is Pulled Away To Show The Detail of The Inner Pipe

APPLY ONLY MIL-PAC BLACK HIGH TEMPERATURE SEALANT (Cat. No. 10K81) to the outside surface of both collars of the adapter (be especially careful to fill the grooves of the outer collar to be covered by the flexible pipe) and slide flexible pipe over inner and outer adapter collars.

1 3/4 inch (44 mm) Flexible PipeandAdapterOuterCollar Overlap

Adapter (SV4.5RF)

Figure 43

Attach Adapter to Appliance

Collar, or Secure Vent Sections

Flex Vent

Securing Screw - 3 Places Equidistant (equally spaced) Just Below Gear Clamp)

Gear Clamps

1 3/4 in. (44 mm) Flexible PipeandAdapterInnerCollar Overlap

Securing Screw

-3 Places, 120° apart (equally spaced) Just Below Gear Clamp

22

end of the adapter over the previously installed section or appliance collar, adjusting the radial alignment until the four locking dimples of the adapter are aligned with the inlets of the four incline channels of the last vent section or collar. Push on the adapter until it fully engages, then twist the adapter clockwise running the dimples down and along the incline channels until they seat at the end of the channels.

Attach the flexible vent to the adapter as fol- lows (see also Figure 43):

A. Install the Inner Flex Pipe -

1.Install the small gear clamp loosely around the inner flexible vent pipe, push it back out of the way.

2.Apply a bead of Mill-Pac Black (700° F) high temperature sealant - Catalog No. 10K81 to the inner adapter collar, approximately 1/2 inch from the end.

3.Pull and extend the inner flexible vent pipe.

4.Slide the inner flex pipe over the adapter col- lar. Ensure the flexible vent pipe completely engages the adapter collar to a distance of 1 3/4 inches from the end, and that it is free

from damage or tears.

5. Slide the gear clamp down and tighten it fully to secure the flexible vent to the adapter inner collar approximately 3/4 inch from the end of the flex.

6. Installthreescrews120degreesapartthrough the flexible vent pipe and into the adapter collar just below the gear clamp to provide additional security to the connection.

B. Install the Outer Flex Pipe -

1.Install the large gear clamp loosely around the outer flexible vent pipe, push it back out of the way.

2.Apply a bead of Mill-Pac Black (700° F) high temperature sealant - Catalog No. 10K81) to the outer adapter collar; to the grooves of the collar which extend approximately 1 inch from the end and to the flat surface, approximately 1-3/8 inches from the end.

3.Pull and extend outer flexible vent pipe.

4.Slide the outer flex pipe over the adapter col- lar. Ensure the flexible vent pipe completely engages the adapter collar to a distance of 1-3/8 inches from the end, and that it is free from damage or tears.

5. Slide the gear clamp down and tighten it fully to secure the flexible vent to the adapter outer collar approximately 3/4 inch from the end of the flex.

6.Install three screws 120 degrees apart through the flexible vent pipe and into the adapter collar just below the gear clamp to provide additional security to the connec- tion.

C.Route Flex Vent -

Ensure that the flex vent is properly routed to provide the required clearance. Do not allow the flexible vent to bend in a radius tighter than 5" (127 mm). Refer to Figure 44. Space out the internal flex vent spacers evenly - approximately every 6 inches - and avoid kinking of inner pipe. Support horizontal sections of flex with metal straps at 2 foot (0.61 m) intervals.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

D.Install Firestop / Spacers at ceilings and walls - When Secure Flex penetrates a wall or ceiling, a firestop / spacer is required: use the SF4.5 VF firestop / spacer for ceilings and the SF4.5 HF firestop / spacer for walls. See the appropriate sectionsand Figuresshown throughoutthe vent- ing section for their installation requirements.

Flexible Vent

Section

	5” (127 mm)
	Radius
Figure 44	Minimum

E. Attach Flex Vent to Termination -

Secure Flex components can be purchased separately and attached to bulk lengths of Se- cure Flex flexible tubing cut to size at the job site. Secure the flexible vent to the Secure Flex terminations in the same manner (see Figure

43)as it was attached to the adapter.

Note:SecureFlexventmustbeattachedtoSecure Flexterminationsonly.DONOTsubstituteSecure Vent terminations or the Secure Vent adapter for Secure Flex components. The collars of Secure Flex terminations and adapters have a different diameter than that used with the Secure Vent pipe. Additionally, Secure Flex components have an extended length center tube for use in attaching the flexible vent.