Lennox Hearth MPD-40 Series A. Install the Inner Flex Pipe, B. Install the Outer Flex Pipe

VERTICAL OR HORIZONTAL VENTING USING SECURE FLEX KITS AND COMPONENTS

Secure Flex venting kits and components may be used in any venting application where rigid Secure Vent (SV4.5) direct vent components can be used. 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. 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 re- quirements or clearance considerations de- tailed in this manual.

Secure Flex kits come with an included adapter that can be fitted to the appliance collar or 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 end of the adapter over the previously installed section or appliance collar, adjusting the radial alignment until the four lock- ing 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 run- ning 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 follows (see also Figure 41):

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, approxi- mately 1/2 inch from the end.

3.Pull and extend the inner flexible vent pipe.

4.Slide the inner flex pipe over the adapter collar. Ensure the flexible vent pipe completely engages the adapter collar to a distance of 1³⁄₄ inch 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.Install threescrews120degreesapartthrough the flexible vent pipe and into the adapter collar just below the gear clamp to provide additional security to the connection.

NOTE: OUTER PIPE IS PULLED AWAY TO SHOW THE DETAIL OF THE INNER PIPE

Apply ONLY MIL-PAC BLACK HIGH TEMPERATURE SEALANT (Catalog 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 in. (44 mm) Flexible Pipe and

Adapter Outer

Collar Overlap

Adapter

(SV4.5RF)

Figure 41

FLEX VENT

SECURING SCREW

(3 PLACES EQUIDISTANT JUST BELOW GEAR CLAMP)

GEAR

CLAMPS

1-3/4 in. (44 mm) Flexible Pipe and Adapter Inner Collar Overlap

SECURING SCREW

(3 PLACES EQUIDISTANT

JUST BELOW GEAR CLAMP)

Attach Adapter to Appliance

Collar, or Secure Vent Sections

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 the outer flexible vent pipe.

4.Slide the outer flex pipe over the adapter collar. Ensure the flexible vent pipe completely engages the adapter collar to a distance of 1³⁄₄ 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 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 connection.

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 42. Support horizontal sections of flex with metal straps at 2 foot (0.61 m) intervals.

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 sections and figures shown throughout the venting section for their installation requirments.

SF-12 or SF-18 Flexible Vent Section

5" (127 mm)

Radius Minimum

Figure 42

E. Attach Flex Vent to Termination - Secure Flex components can be purchased separately and attached to bulk lengths of Secure 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 41) as it was attached to the adapter.

Note: Secure Flex vent must be attached to Se- cure Flex terminations only. DO NOT substitute Secure Vent terminations or the Secure Vent adapter for Secure Flex components. The collars of Secure Flex terminations and adapters have a different circumference than that used with the Secure Vent pipe. Additionally, Secure Flex componentshaveanextendedlengthcentertube for use in attaching the flexible vent.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

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