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 Chimneys FTF10 chimney system is a two piece chimney, which snap together from the fireplace up. Start with the inner flue section with the lanced end up, snap lock it in to 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 pen- etrate the roof flashing openings (Figure 25 ). Always maintain 2" minimum air space to com- bustible materials and always check each chim- ney joint (inner and outer) to ensure proper engagement. Check vertical alignment of chim- ney so that it projects from the roof in true vertical position.
1"* 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 12, Figure 36 ).
Step 5. The height of vertical chimney pipe supported only by the fireplace must not ex- ceed 30'. Chimney heights above 30' must be supported by a Model
Note: The Model
Install the Model
FTF8-S4 Stabilizer
Figure 26
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Note: Do not apply excessive pressure to any subsequent chimney sections following the stabilizer when installing. Ensure each subse- quent chimney section is securely attached by testing as noted in Step 4.
Step 6. Select the proper Security Chimneys roof flashing based on pitch of roof. Use chart below for selection:
Roof Pitch | Model |
|
|
Flat to 6/12 | F10F6 |
|
|
6/12 to 12/12 | F10F12 |
|
|
Next, slide roof flashing over extended chimney section that previously has been installed above the roof opening in Step 4. FTF10 flashings require flashing spacers. Slide flashing all the way down until the flashing base rests flat on the roof (Figure 27 ). Again, check the vertical position of the chimney and the 2" minimum air space to combustibles.
FTF10 Chimney 
Do Not Seal
Flashing Spacers 
FTF10 Flashing 
Figure 27
Note: Do not caulk or seal the ventilating openings.
Step 7. Secure flashing by attaching along the perimeter into roof using 8d nails or equivalent. If shingled roof, slide upper end and sides of roof flashing under shingles (trim if neces- sary), seal the top and both sides of the flashing to the roof with roof caulking. Cover nail heads with roof caulking (Figure 28 ).
Figure 28
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