Lennox Hearth LMDV-3530-CPM Vertical Offset Installation, Attach vent components to each other

Vertical (Offset) Installation

Analyze the vent routing and determine the quantities of vent sections and number of elbows required. Refer to Vertical Vent Figures and Tables on Pages 15 and 16 to select the type of vertical installation desired. Vent sections are available in net lengths of 4-1/2" (114 mm), 10-1/2" (267 mm), 22-1/2" (572 mm), 34-1/2" (876 mm) and 46-1/2" (1181 mm). Refer to the Vent Section Length Chart on Page 12 for an aid in selecting length combinations. Elbows are available in 90° and 45° configurations. Refer to Figure 24 on Page 14 for the SV4.5E45 and SV4.5E90 elbow dimensional specifications.

Where required, a telescopic vent section (SV4.5LA) may be used to provide the installer with an option in installing in tight and confined spaces or where the vent run made up of fixed length pieces develops a joint in a undesirable location, or will not build up to the required length. The SV4.5LA Telescopic Vent Section has an effective length of from 1-1/2" (38 mm) to 7-1/2" (191 mm). The SV4.5LA is fitted with a locking inclined channel end (identical to a normal vent section component) and a plain end with 3 pilot holes. Slip the plain end over the locking channel end of a standard SV4.5 vent component the required distance and secure with three screws.

Maintain a minimum 1" (25 mm) clearance to combustiblematerialsforallverticalelements. Clearances for all horizontal elements are 3" (76 mm) on top, 1" (25 mm) on sides and 1" (25 mm) on the bottom.

A. Frame ceiling opening - Use a plumb line from the ceiling above the appliance to locate center of the vertical run. Cut and/or frame an opening, 10-1/2" x 10-1/2" (267mm x 267mm) inside dimensions, about this center mark (Figure 21).

10-1/2" Min. (267 mm)

10-1/2" Min.

(267 mm)

Figure 21

B. Attach vent components to appliance - Secure Vent SV4.5 direct vent system compo- nents are unitized concentric pipe components featuring positive twist lock connections (see Figure 22).

All of the appliances covered in this document are fitted with collars having locking inclined channels. The dimpled end of the vent com- ponents fit over the appliance collar to create the positive twist lock connection.

	Align the dimple (four places) of the
	upper vent section with the opening
	of the locking incline channel on the
	lower vent section or appliance col-
	lar. Twist vent component clockwise
	to engage and seal until arrow and
Arrow	dimple align.
	Dimple
	Locking Incline
	Channel
	Connected Vent	Arrow
	Sections

Appliance Collar or

Vent Section

Figure 22

Toattachaventcomponenttotheappliancecollar, align the dimpled end over the collar, adjusting the radial alignment until the four locking dimples are aligned with the inlet of the four inclined channels on the collar (refer to Figure 22). Push the vent component against the collar until it fully engages, then twist the component clockwise, running the dimples down and along the incline channels until they seat at the end of the chan- nels. The unitized design of the Secure Vent components will engage and seal both the inner and outer pipe without the need for sealant or screws. If desired, a #6 x 1/2" screw may be used at the joint, but is not required as the pipe will securely lock when twisted.

Note: An elbow may also be attached to the appliance collar. Attach in the same manner as you would a vent section.

C. Attach vent components to each other

-Other vent sections may be added to the previously installed section in accordance with the requirements of the vertical vent Figures and Tables.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

To add another vent component to a length of vent run, align the dimpled end over the inclined channel end of the previously installed section, adjusting the radial alignment until the four lock- ing dimples are aligned with the inlets of the four incline channels of the previous section.

Push the vent component against the previous section until it fully engages, then twist the component clockwise running the dimples down and along the incline channels until they seat at the end of the channels. This seating position is indicated by the alignment of the arrow and dimple as shown in Figure 22.

D. Install firestop/spacer at ceiling - When using Secure Vent, use SV4.5VF firestop/spacer at ceiling joists; when using Secure Flex, use SF4.5VF firestop/spacer. If there is living space above the ceiling level, the firestop/spacer must be installed on the bottom side of the ceiling. If attic space is above the ceiling, the firestop/spacer must be installed on the top side of the joist. Route the vent sections through the framed opening and secure the firestop/spacer with 8d nails or other appropriate fasteners at each corner. Remember to maintain 1" (25 mm) clearance to combustibles, framing members, and attic or ceiling insulation when running vertical chimney sections. Attic insulation shield (H3907) may be used to obtain the required clearances indicated here. See installation accessories Pages 31 & 32.

E. Support the vertical vent run sections - Note - Proper venting support is very important. The weight of the vent must not be supported by the fireplace in any degree.

Support the vertical portion of the venting system every 8 feet (2.4m) above the fireplace vent outlet.

Blocking

Support Straps

(Plumber's tape)

8 feet (2.4 m)

Maximum

1 inch (25.4

mm) minimum

clearance to

combustibles

Figure 23

13