Lennox Hearth Merit Series RDI-36-H - Manual (Page 10)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 10
Locking Band
Waterproof
Caulk
Step 9. Security Chimneys locking bands,
Model FLB, may be required if the chimney
extends too high above the roof flashing. As a
general rule, if the chimney extends more than
6' above the roof flashing, the use of locking
bands is advisable to strengthen the chimney
assembly. Align the locking band at the chim-
ney joint. Locking bands wrap around pipe
joints equally covering the joints of both pipe
sections. Use the nut provided and TIGHTEN
snugly. Do not overtighten as this might dam-
age the chimney section (
refer to Figure 32 ).
Note: If chimney extends more than 8' above
roof surface, guy wires are also recommended.
Use three (3) guy wires, attach to locking band
assembly, extend and secure to roof in a trian-
gular pattern (Figure 33 ). Guy wires are not
supplied by the manufacturer.
Roof Ridge
120 °
Security 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 39 ).
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 29 ).
Figure 29
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 roof flash-
ing based on pitch of roof. Use chart below for
selection:
Roof Pitch Model
Flat to 6/12 F8F6
6/12 to 12/12 F8F12
Next, slide roof flashing over extended chimney
section that previously has been installed above
the roof opening in Step 4. FTF8 flashings
require flashing spacers. Slide flashing all the
way down until the flashing base rests flat on
the roof (
Figure 30 ). Again, check the vertical
position of the chimney and the 2" minimum air
space to combustibles.
FTF8-S4 Stabilizer
Step 8. Slide the FTF8 storm collar (ordered
separately) over outer chimney. Rest on flash-
ing spacers and align with top surface of
flashing. Insert tab in slot, pull tight and bend
tab back over slot. Seal storm collar to outer
chimney with roof caulking or mastic around
entire circumference of pipe. Also add extra
roof caulking to the tab/slot area to seal com-
pletely against water penetration (
Figure 32 ).
Check all joints very carefully to ensure no
water intrusion can take place.
FTF8 Chimney
FTF8 Flashing
Flashing Spacers
Do Not Seal
Figure 33
Figure 30
Note: Do not caulk or seal the ventilating
openings.
Step 7. Secure flashing by nailing along the
perimeter into roof using 8d nails. If shingled
roof, slide upper end and sides of roof flashing
under shingles (trim if necessary), seal the top
and both sides of the flashing to the roof with
roof caulking. Cover nail heads with roof caulk-
ing (
Figure 31 ).
Figure 31
Figure 32
Step 10. Using a FTF8-CTD Round Termination:
1. Hold the FTF8-CTD over top of last chimney
section (
Figure 34 ).
2. Center inner slip section in inner flue pipe-
slip down.
3. Center outer locking section over outer flue
pipe. Push down until locking tabs are firmly
engaged.
Figure 34
CTD
Termination
Chimney
4. Pull up slightly on CTD to ensure locking joint
has firmly engaged.