Lennox Hearth LMDVR-3328-CNM Typical Horizontal Vent Installation, See on Page 12 or on

Building	Support Brackets	TYPICAL HORIZONTAL VENT INSTALLATION
Support
			Horizontal / Inclined Run
Framing				SV4.5 HT-2
SV4.5E90				Termination
				Shown
Elbow
			SV4.5L6/12/24/36/48
Ceiling			Vent Sections	Exterior
	uFirestop / Spacer			Wall
Vertical		SV4.5VF	Support Bracket Spacing
Rise
			Every 5 ft (1.52 m)
			uWhen Using Secure Flex,
			Use Firestop / Spacer SF4.5VF	SV4.5 HT-2
		See Figure 20 on Page 12 or Figure 23 on		Termination
				Shown
		Page 13 for vertical vent section support.
			Fireplace

Figure 33

B. Frame exterior wall opening -

Locate the center of the vent outlet on the exterior wall according to the dimen- sions shown in Figure 14 on Page 9. Cut and/or frame an opening, 10-1/2" x 12 1/8" (267 mm x 308mm) inside dimensions, about this center.

C. Frame ceiling opening - If the vertical route is to penetrate a ceiling, use plumb line to locate the center above the appliance. Cut and/or frame an opening, 10-1/2" x 10-1/2" (267 mm x 267

mm)inside dimensions, about this center (refer to Figure 21 on Page 13 ).

D. Attach vent components to appliance - To attach a vent component to the appliance collar, align the dimpled endover the collar, adjustingthe radial alignment until the four locking dimples are aligned with the inlets of the four incline channels on the collar (see Figure 22 on Page 13).

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 channels.

The unitized design of the Secure Vent components will engage and seal both the inner and outer pipe elements with the same procedure. Sealant and securing screws are not required.

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

E. Attach vent components to each other - Other vent sections may be added to the pre- viously installed section in accordance with the requirements of the vent tables. To add another vent component to a length of vent run, align the dimpled end of the component 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 on Page 13.

F. 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.

G. Support the vertical run sections - See Section E on Page 13.

H. Change vent direction - At transition from or to a horizontal/inclined run, install the SV4.5E45 and SV4.5E90 elbows in the same manner as the straight vent sections. The elbows feature a twist section to allow them to be routed about the center axis of their initial collar section to align with the required direction of the next vent run element. Twist elbow sections in a clockwise direction only so as to avoid the possiblity of unlocking any of the previously connected vent sections. See Figure 22 on Page 13.

I. Continue installation of horizontal/inclined sections - Continue with the installation of the straight vent sections in horizontal/inclined run as described in Step E. Install support straps every 5 ft. (1.52 m) along horizontal/inclined vent runs using conventional plumber’s tape.

See Figure 33. It is very important that the horizontal/inclined run be maintained in a straight (no dips) and recommended to be in a slightly elevated plane, in a direction away from the fireplace of 1/4" rise per foot (20 mm per meter) which is ideal, though rise per foot run ratios that are smaller are acceptable all the way down to at or near level.

It is important to maintain the required clear- ances to combustibles: 1" (25 mm) at all sides for all vertical runs; and 3" (76 mm) at the top, 1" (25 mm) at sides, and 1" (25 mm) at the bottom for all horizontal/inclined runs.

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.

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