Lennox Hearth HCI-36-H, RDI-36-H Roof Pitch Model Flat to 6/12, 12 to 12/12

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 ).

FTF8-S4 Stabilizer

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

FTF8 Chimney

Do Not Seal

Flashing Spacers

FTF8 Flashing

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

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.

Locking Band

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°

Figure 33

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.

CTD

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

Waterproof Caulk

Termination

Figure 34

Chimney

10

position of the chimney and the 2" minimum air space to combustibles.

Figure 32

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.

4.Pull up slightly on CTD to ensure locking joint has firmly engaged.