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 29 and 30).

Room Above

Firestop Spacer

Figure 29

Attic Above

Firestop Spacer

Figure 30

For Canada Only

When installing the chimney system through an open attic space, the attic shield assembly- firestop spacer must be used (Figure 31 ). This installation is Warnock Hersey Inc. listed only for use in Canada.

Open Attic Space

Figure 31

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

The FTF8 chimney system is a two-piece chim- ney, which snaps 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 (7 locking tabs per joint). Check each piece by pulling up slightly from the top to ensure proper engagement before installing succeeding sections, 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 32 ).

Figure 32

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 33 ).

Locking Tabs (Lances)

Figure 33

Note: Assemble one component of chimney at a time (inner section first, then outer section last) beforeproceedingwiththenextcompletesection.

Continue to assemble the chimney up through framed ceiling opening. Assemble just enough to penetrate the roof flashing openings (Figure 34 ). Always maintain 2" (51 mm) minimum air space to combustible materials and always check each pipe joint (inner and outer) to ensure proper engagement.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

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

Figure 34

Check vertical alignment of chimney pipe so that it projects from the roof in a true vertical position. Security's chimney sections do not need to be screwed together. Additional reinforcement is not necessary, except in certain offset conditions (see to page 16, Figure 47 ).

Step 5. The height of vertical chimney pipe supported only by the fireplace must not exceed 30' (9.1 m). Chimney heights above 30' (9.1 m) must be supported by a Model FTF8- S4 stabilizer installed at 30' (9.1 m) intervals.

Note: The Model FTF8-S4 adds 3" (76 mm) net effective height to the total chimney system.

Install the Model FTF8-S4 stabilizer by fitting inner section down into respective section 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 securely (un- der tension in “shear”) into place on framing. Use 8d nails. Attach successive lengths of chimney pipe directly to stabilizer using same techniques as described in Step 4 (Figure 35 ).

FTF8-S4 Stabilizer

Figure 35

Note: Do not apply excessive pressure to any subsequent chimney sections following the stabilizer when installing. Ensure each subsequent chimney section is securely attached by testing as noted in Step 4.

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