Lennox Hearth WOOD-BURNING FIREPLACES EST-50* - Manual (Page 13)

NOTE: DIAGRAMS & ILLUSTRATIONS ARE NOT TO SCALE.
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LENNOX HEARTH PRODUCTS • ESTATE™ SERIES WOOD-BURNING FIREPLACES • MODELS EST-36, EST-42, EST-50 • INSTALLATION INSTRUCTIONS
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 disassembled, the tabs might
become damaged. Be certain tabs are properly
formed to ensure locking tabs engage properly.
Security Chimneys™ FTF10 and FTF13 chimney
systems are 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 24).
FTF8-S4 Stabilizer
Figure 24
Locking
Tabs
(Lances)
Figure 25
Install the Model FTF10-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 (under 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 27).
Figure 27
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
penetrate the roof flashing openings (Figure
26). Always maintain 2" minimum air space
to combustible materials and always check
each chimney joint (inner and outer) to ensure
proper engagement. Check vertical alignment
of chimney so that it projects from the roof in
true vertical position.
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 25).
For Canada Only
When installing the chimney system through
an open attic space, the attic shield assembly-
firestop spacer must be used (Figure 23). This
installation procedure is listed and approved
by Warnock Hersey, Inc., and only required
for use in Canada.
Figure 23
Open Attic Space
Figure 26
Chimney sections from Security Chimneys do
not need to be screwed together. Additional
reinforcement is not necessary except in cer-
tain offset conditions (refer to Figure 38 on
page 16).
step 5. The height of vertical chimney pipe
supported only by the fireplace must not
exceed 30'. Chimney heights above 30' must
be supported by a Model FTF10-S4 stabilizer,
installed at 30' intervals.
Note: The Model FTF10-S4 adds 3" net effective
height to the total chimney system.
2" (51mm) Min. Air Space
to Combustibles
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 28). Again, check the vertical
position of the chimney and the 2" minimum
air space to combustibles.
Figure 28
Note: Do not caulk or seal the ventilating
openings.
FTF10 Chimney
FTF10 Flashing
Flashing Spacers
Do Not Seal