Installing the Chimney System

Step 4. Fireplace should be secured to side framing members using the nailing tabs at the top and bottom of the fireplace front face. Use 8d nails or equivalent (Figure 17 ).

8d Nail Or

Equivalent

Figure 17

Note: The nailing tabs and the area directly behind the nailing tabs are exempt from the clearances described on page 5. Maintain at least 1" clearance from the firebox wrapper to the framing at the closest point of contact, directly adjacent to the flange.

For Canadian Installations Proceed with Steps 5 through 8

Step 5. Attach the cold climate kit, Model CCK-HCRD, around the chimney collar with the screws provided (see Figure 18 ).

Note: CCK-HCRD model requires a 6" diameter Class 0 metallic air duct, acquired locally by installer.

Chimney Duct

Duct Collar

Front Cover

Plate “A”

Front Cover

Plate “B”

Front Cover Plate “A”

Knockout

Figure 18

Step 6. Connect the 6" (152 mm) Class 0 metallic air duct to the collar on the chimney collar enclosure with the screws provided in the hardware kit.

Step 7. Route the Class 0 metallic air duct out the back wall or side wall, up through the ceiling or floor joists to an outside wall. The air duct’s inlet should be located above any anticipated snow level.

Note: If the fireplace is installed against an inside wall, the Class 0 metallic air duct may be extended into a ventilated attic space at least 18" (457 mm) above the attic floor. Secure the duct hood to a vertical post with the inlet positioned downward. Ensure that nothing blocks the hood opening. This air duct must never terminate higher than the fireplace chimney.

Step 8. Cut or frame a hole through the outside wall for the installation of the duct inlet hood. A 6-1/2" (165 mm) diameter 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 inlet hood using two (2) screws. Insert the hood into the opening. Secure in place with nails driven through the holes in hood flange. Seal with noncombustible waterproof silicon type caulking. If additional air duct is needed, use Class 0 metallic duct.

Step 1. Before continuing, check the operation of the damper, as described on page 4, (refer to Figure 3 ).

Step 2. Using standard construction framing techniques, construct opening for chimney route up through the ceiling(s) and roof or through an outside chase.

Framing must maintain adequate minimum air space clearance at all times.

CAUTION: ALLOW MINIMUM 2" CHIMNEY AIR SPACE TO COMBUSTIBLE FRAMING MEM- BERS THROUGHOUT VERTICAL OR OFFSET CHIMNEY INSTALLATION.

A minimum 2" air space must be reserved for all combustible materials extending for any continuous length surrounding the chimney.

Reference Figures 15 and 16 and charts Fram- ing Dimensions for Ceiling and Roof, which specify minimum ceiling and roof dimensions.

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

For remodeling, plumb to center of flue collar from ceiling above, drive nail through ceiling from below to mark position, then mark and cut to passage from above ceiling (around nail) (see Figure 19 ). Then plumb from ceiling or roof level directly above hole which has just been completed.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Figure 19

Step 3. Position appropriate firestop spacer at ceiling and fasten temporarily with two (2) 8d nails or equivalent. Use flat firestop spacer, Model F8FS-2, if chimney penetrates ceiling vertically. If chimney penetrates ceiling at 30° angle (offset chimney), use 30° firestop spacer, Model F8FS30-2. Use one nail on opposite sides to hold firestop spacer in position. Fasten permanently, using at least two (2) more 8d nails or equivalent, after chimney sections have been assembled through the firestop spacer and after any necessary adjustments have been made. Firestop spacer must be secured by at least four (4) 8d nails or equivalent when com- pletely installed.

Note: If there is a room above ceiling level, firestop spacer must be installed on the bottom side of the ceiling. If an attic is above ceiling level, firestop spacer must be installed on top side of ceiling joist (Figures 20 and 21 ).

Room Above

Firestop Spacer

Figure 20

Attic Above

Firestop Spacer

Figure 21

RDI-42-H, HCI-42-H, RDI-42, HCI-42 specifications

The Lennox Hearth series includes some of the most impressive gas fireplaces available, such as the HCI-42, RDI-42-H, HCI-42-H, and RDI-42. These models are designed to blend efficiency, style, and comfort, making them ideal for modern homes.

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