Lennox Hearth CR-3835R Or Ceiling, 51mm** See **Note Min. Air Space to Combustibles, Stabilizer

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 F8FS30-2 firestop spacer as shown in Figures 21 and 22. Support the chimney at floor or ceiling penetration with a FTF8 stabi- lizer if distance of chimney below ceiling is 10' or more. Maintain 2" minimum air space to combustibles from chimney sections.

Attic Space
F8FS30-2	2" Min.
Firestop Spacer
	Air Space
2" Min.	FTF8-S4 Stabilizer
Air Space
10'
Max.	30° Firestop
	And Attic Above
Figure 21
Room Above
F8FS30-2	2" Min.
Firestop Spacer
	Air Space
2" Min.	FTF8-S4 Stabilizer
Air Space
10'	30° Firestop
Max.	And Room Above

Figure 22

Step 4. Note: Chimney sections are constructed with a unique locking tab design, which en- sures an immediate, tight assembly between sections. Plan your chimney requirements care- fully before assembly as chimney is difficult to disassemble after installation. If disassembled, the tabs might become damaged. Be certain tabs are properly formed to ensure locking tabs engage properly.

Security's FTF8 and FTF10 chimney systems are two piece chimneys, which snap together from the fireplace up. Start with the inner flue section. With the lanced end up, snap lock it into the matching collar on top of the fireplace.

At all subsequent joints, the upper flue section fits into the preceding flue section. Each piece snaps together by means of locking tabs (9 locking tabs per joint). Check each piece by pulling up slightly from the top to ensure proper engagement before installing the next section. If the flue has been installed correctly, it will not separate when you test it. Also, the inner flue joint where each section is joined should be tight and flat without gaps (Figure 23 ).

Figure 23

Outer pipe section installs in just the opposite way; the lanced end goes down and each new section goes OVER the outside of the previous section installed (Figure 24 ).

Locking Tabs (Lances)

Figure 24

Note: Assemble one component of chimney at a time (inner section first, then outer section last) before proceeding with the next complete section.

Continue to assemble the chimney up through framed opening. Assemble just enough to pene- trate the roof flashing openings (Figure 25 ).

**Note: 1" (25 mm) when installed with FTF10 in the U.S. only.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

Always maintain 2" (51 mm) minimum air space to combustible materials and always check each chimney joint (inner and outer) to ensure proper engagement (See **Note). Check verti- cal alignment of chimney so that it projects from the roof in true vertical position.

2" (51mm)** (See **Note) Min. Air Space to Combustibles

Figure 25

Security's chimney sections do not need to be screwed together. Additional reinforcement is not necessary except in certain offset condi- tions (refer to page 14, Figure 36 ).

Step 5. The height of vertical chimney pipe supported only by the fireplace must not ex- ceed 30' (9.1 m). Chimney heights above 30' (9.1 m) must be supported by a Model F8-S4 or Model F10-S4 stabilizer installed at 30' (9.1 m) intervals.

Note: The Model F8-S4 and Model F10-S4 add 3" (76 mm) net effective height to the total chimney system.

Install Model F8-S4 or F10-S4 stabilizer by fitting inner section down into respective sec- tion of proceeding flue pipe and locking outer stabilizer section into place over the outer chimney pipe. Position for proper clearance through framed opening and nail straps se- curely (under tension in “shear”) into place on framing. Use 8d nails or equivalent. Attach successive lengths of chimney pipe directly to stabilizer using same techniques as described in Step 4 (Figure 26 ).

Stabilizer

Figure 26

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