Lennox Hearth LSO-43 installation instructions Installing the Chimney System, Feet

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Step 4. The fireplace should be secured to the side framing members through the nailing flange (Figure 16 ).

Framing

Stud

Nailing

Flange8d Nail Or

Equivalent

Figure 16

Note: The nailing flange and the area directly behind the nailing flange is exempt from the clearances described on the fireplace clear- ance label.

Step 5. Connect the 6" (152 mm) Class 0 air duct provided, to the collar on the fireplace with the clamps provided in the kit’s hardware package (Figure 17 ).

Air Duct

Air Inlet

Clamps

Note: Air Inlet

Must Be Free Of

Any Obstructions

Figure 17

Step 6. Route the Class 0 air duct out the back or side to an outside wall. The duct inlet should be located above any anticipated snow level. Check local building codes for any restrictions. We recommend that the inlet be at least 4 feet above grade level.

Note: Secure the duct hood to a vertical post with the inlet positioned downward. Ensure that nothing blocks the hood opening. This duct must never terminate higher than 3 feet below the fireplace termination (Figure 18 ).

3 Feet

Figure 18

Step 7. Cut or frame a hole through the outside of the enclosure for the installation of the duct inlet hood. A 6 ¹⁄₂" (165 mm) diam- eter hole is required. Feed the loose end of the flexible duct through the hole cut for the inlet hood and attach to the collar on the inlet hood using one of two clalmps provided with the kit. Insert the hood into the opening. Secure in place with nails driven through the holes in hood flange. Seal with noncombustible wa- terproof silicon type caulking. If additional duct is needed, use Class 0 metallic air duct (refer to Figure 17 ).

INSTALLING THE CHIMNEY SYSTEM

Step 1. Using standard construction framing techniques, construct openings for the chim- ney through the ceiling(s) and roof or through an outside chase. All framing must maintain the minimum air space clearance at all times.

CAUTION: ALLOW A MINIMUM 2" (51 MM)

CHIMNEY AIR SPACE TO COMBUSTIBLE FRAM- ING MEMBERS THROUGHOUT VERTICAL AND/ OR OFFSET CHIMNEY INSTALLATIONS.

A minimum 2" (51 mm) air space must be reserved for all combustible and noncombus- tible materials extending for any continuous length surrounding the chimney.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Reference Figures 14 and 15 and charts “Fram- ing Dimensions for Ceiling and Roof,” which specify minimum ceiling and roof dimensions.

For new construction, to determine chimney cen- ter line, use plumb line from ceiling or roof above fireplace to the center of fireplace flue collar.

For remodeling, plumb to the center of the fireplace flue collar from the ceiling or roof above. Drive a nail through the ceiling or roof from below to mark position. Mark and cut a hole in the ceiling (around the nail) (Figure 19 ). Then plumb from ceiling or roof directly above the cut hole to determine roof hole position.

Figure 19

Step 2. Position the appropriate firestop spacer at the ceiling and fasten temporarily with two (2) 8d nails or equivalent. Use a flat firestop spacer, Model F10FS-2, for the FTF10 system if chimney penetrates vertically. If the chimney penetrates through the ceiling at a 30° angle (offset chimney) then use a 30° firestop spacer, Model F10FS30-2. Use one nail on opposite sides of the firestop to hold in position. Fasten permanently, using at least two (2) more 8d nails or equivalent, after the chimney sections have been assembled through the firestop spacer and after necessary adjustments have been made. The firestop spacer must be se- cured in place by at least four (4) 8d nails or equivalent when completely installed.

Note: If patio installation requires that a chim- ney passes through a roof or room above, be sure to comply with all local building codes.