Lennox Hearth LBC-4324-H Or Ceiling, For Canada Only, 8d nails when completely installed

Step 3. Position the appropriate firestop spacer at the ceiling and nail temporarily with

Attic Space

Note: For Canadian installations, all chimney installedoutsidethebuildingmustbeconstructed

two (2) 8d nails. Use a flat firestop spacer, Model F10FS-2, for the FTF10 system if chim- ney penetrates vertically. If the chimney pen- etrates 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. Nail perma- nently, using at least two (2) more 8d nails, after the chimney sections have been assembled through the firestop spacer and after necessary adjustments have been made. The firestop

F10FS30-2 Firestop Spacer

2" Min.

Air Space

2" Min.

Air Space

FTF10-S4

Stabilizer

10'

Max. 30° Firestop

And Attic Above

with galvalume (outer sections only) effective January 1, 1992. The appropriate model desig- nations are located in the back of this manual.

The FTF10 chimney system is a two piece chim- ney that snap locks together from the fireplace up. Always start with the inner flue section. With the lanced end up, snap lock the joint into the matching collar on top of the fireplace. At all subsequent joints, the upper flue section fits into the lower or preceding flue section. Each section

spacer must be secured in place by at least four

(4) 8d nails when completely installed.

Note: If there is a room above the ceiling level, the firestop spacer must be installed on the bottom side of the ceiling. If an attic is above the ceiling level, the firestop spacer must be in- stalled on the top side of the ceiling joists (Figures 21 and 22 ).

Room Above

Firestop Spacer

Figure 21

Attic Above

Firestop Spacer

Figure 22

CHIMNEY 30° OFFSET THROUGH FLOOR

OR CEILING

It may be necessary to assemble the chimney at 30° when passing through the floor or ceiling area. Use the F10FS30-2 firestop spacer as shown in Figures 23 and 24. Support the chimney at floor or ceiling penetration with a FTF10 stabilizer if distance of chimney below ceiling is 10' or more. Maintain 2" minimum air space to combustibles from chimney sections.

Figure 23

Room Above
F10FS30-2	2" Min.
Firestop Spacer
	Air Space
2" Min.	FTF10-S4
Air Space	Stabilizer
10'	30° Firestop
Max.	And Room Above

Figure 24

For Canada Only

When installing the chimney system through an open attic space, the attic shield assembly- firestop spacer must be used (Figure 25 ). This installation is required only for use in Canada.

Open Attic Space

Figure 25

Step 4. Note: All chimney sections are con- structed with a unique locking tabs and hem design, which ensures and immediate, tight assembly between sections. Plan your chimney requirements carefully before assembly, as the chimney is difficult to disassemble after instal- lation. If disassembled, the tabs might become damaged. Be certain that the tabs are properly formed to ensure they engage properly.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

snaps together by means of locking tabs (9 tabs per joint). Check each section by pulling up slightly from the top to ensure proper engage- ment before installing succeeding sections. If the flue has been installed correctly, it will not separate when tested. Also, the inner flue joint where each section is joined should be tight and flat without gaps (Figure 26 ).

Figure 26

The outer chimney section installs the opposite way; the lanced end goes down and each new section installs OVER the outside of the previ- ous section (Figure 27 ).

Locking Tabs (Lances)

Figure 27

9