Marco Designer Series Installation Instructions Manual page 9

Attic Space
F8FS30-2
Firestop Spacer
FTF8-S4 Stabilizer
2" Min.
Air Space
10'
Max.
Figure 21
Room Above
F8FS30-2
Firestop Spacer
2" Min.
FTF8-S4 Stabilizer
Air Space
10'
Max.
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
carefully before assembly as chimney is diffi-
cult to disassemble after installation. If disas-
sembled, the tabs might become damaged. Be
certain tabs are properly formed to ensure
locking tabs engage properly.
The FireCraft FTF8 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 ).
2" Min.
Air Space
30° Firestop
And Attic Above
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 ).
2" Min.
Air Space
30° Firestop
And Room Above
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.
Figure 25
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
FireCraft 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'. Chimney heights above 30' must be
supported by a Model FTF8-S4 stabilizer in-
stalled at 30' intervals.
Note: The Model FTF8-S4 adds 3" 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 stabi-
lizer section into place over the outer chimney
pipe. Position for proper clearance through
framed opening and nail straps securely (under
tension in "shear") into place on framing. Use
8d nails. Attach successive lengths of chimney
pipe directly to stabilizer using same tech-
niques as described in Step 4 ( Figure 26 ).
Locking
Tabs
(Lances)
Figure 26
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 FireCraft roof flash-
ing based on pitch of roof. Use chart below for
selection:
2" Min. Air Space
To Combustibles
FTF8-S4 Stabilizer
Roof Pitch Model
Flat to 6/12 F8F6
6/12 to 12/12 F8F12
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