Lennox Hearth Merit Series RDI-36-H - Manual (Page 12)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 12
Step 2. Use “Height of Chimney Only” column
in The Vertical Elevation Chart to determine
combinations of chimney used above return
elbow to achieve desired heights. Reference
Components Effective Height Chart in vertical
elevation chart section. 4. Determine amount of chimney height re-
quired by subtracting total combined height of
all pre-selected components (fireplace and
chimney components from total desired height.)
Reference Vertical Elevation Chart and deter-
mine the number of chimney sections (quantity
and length) required.
SPECIAL OFFSET INSTRUCTIONS
To clear any overhead obstructions, you may
offset your chimney system using Security's
30
° offset and return elbows. Use two elbows -
an offset elbow to initiate the offset and a return
elbow to terminate it. A 30
°
offset elbow, an-
gling in any direction, may be the first compo-
nent used off the top of the fireplace flue collar.
The offset and return elbows may be attached
together, or a section or sections of chimney
may be used between, but do not exceed 20' in
total length between elbows. If sections of pipe
exceed 10' between elbows, a chimney stabilizer
must be used at the midpoint (
Figure 37 ). The
stabilizer support straps must be attached under
tension (in shear) to structural framing mem-
bers above. When two sets of elbows are used,
the maximum combined length of chimney used
between elbows cannot exceed 20' (
Figure 38 ).
Example: If C
1
= 10' then C
2
cannot exceed 10'.
If an offset exceeds 6' in length, each chimney
joint beyond the first 6' of offset to the return
elbow, must be secured by a No. 8 x 1/2" sheet
metal screw located at the underside of the joint
(
Figure 39 ).
A 1/8" diameter hole must be drilled in the
chimney joint using a 1/8" diameter drill. Hole
should be drilled in center of joint overlap (
Fig-
ure 40 ). Be sure to drill only through the outer
chimney casting. Do not puncture the inner flue.
Maximum offset of chimney system is 30
°
.
Two offsets must not be assembled to form a
60
°
offset. However, two sets of offset and
return elbows may be used on a single flue
system, provided the total height of the system
exceeds 25'.
Return elbow support straps must be securely
attached under tension (in shear) to structural
framing members above. Do not substitute a
FTF8-30 offset elbow in place of a FTF8-E30
return elbow.
OFFSET CALCULATIONS
Step 1. Use Offset Chart to determine amount
of horizontal offset (A) and height (B) for vari-
ous chimney section assemblies.
FTF8 VERTICAL ELEVATION CHART
Step 3. Use Elevation Chart as job estimator
only. Add necessary firestop spacers and stabi-
lizers as required. Firestop spacers must be
used as shown in
Figures 23 and 24 and
stabilizers as shown in Figure 29.
Height Of Number Of FTF8
Chimney Only Chimney Lengths
Inches Feet/Inches 12" 18" 36" 48"
Height Of Number Of FTF8
Chimney Only Chimney Lengths
Inches Feet/Inches 12" 18" 36" 48"
386 ¹⁄₂ 32 2 ¹⁄₂ 0 1 0 8
390 ³⁄₄ 32 6 ³⁄₄ 2 0 0 8
396 ³⁄₄ 33 0 ³⁄₄ 1 1 0 8
404 ¹⁄₂ 33 8 ¹⁄₂ 0 0 1 8
414 ³⁄₄ 34 6 ³⁄₄ 1 0 1 8
416 ¹⁄₂ 34 8 ¹⁄₂ 0 0 0 9
420 ³⁄₄ 35 0 ³⁄₄ 0 1 1 8
426 ³⁄₄ 35 6 ³⁄₄ 1 0 0 9
432 ³⁄₄ 36 0 ³⁄₄ 0 1 0 9
437 36 5 2 0 0 9
443 36 11 1 1 0 9
450 ³⁄₄ 37 6 ³⁄₄ 0 0 1 9
461 38 5 1 0 1 9
462 ³⁄₄ 38 6 ³⁄₄ 0 0 0 10
466 ³⁄₄ 38 10 ³⁄₄ 0 1 1 9
472 ³⁄₄ 39 4³⁄₄ 1 0 0 10
478 ³⁄₄ 39 10 ³⁄₄ 0 1 0 10
483 40 3 2 0 0 10
489 40 9 1 1 0 10
496 ³⁄₄ 41 4 ³⁄₄ 0 0 1 10
507 42 3 1 0 1 10
508 ³⁄₄ 42 4 ³⁄₄ 0 0 0 11
513 42 9 0 1 1 10
519 43 3 1 0 0 11
525 43 9 0 1 0 11
529 ¹⁄₄ 44 1 ¹⁄₄ 2 0 0 11
535 ¹⁄₄ 44 7 ¹⁄₄ 1 1 0 11
543 45 3 0 0 1 11
553 ¹⁄₄ 46 1 ¹⁄₄ 1 0 1 11
555 46 3 0 0 0 12
559 ¹⁄₄ 46 7 ¹⁄₄ 0 1 1 11
565 ¹⁄₄ 47 1 ¹⁄₄ 1 0 0 12
571 ¹⁄₄ 47 5 ¹⁄₄ 0 1 0 12
575 ¹⁄₂ 47 11 ¹⁄₂ 2 0 0 12
581 ¹⁄₂ 48 5 ¹⁄₂ 1 1 0 12
589 ¹⁄₄ 49 1 ¹⁄₄ 0 0 1 12
599 ¹⁄₂ 49 11 ¹⁄₂ 1 0 1 12
601 ¹⁄₄ 50 1 ¹⁄₄ 0 0 0 13
605 ¹⁄₂ 50 5 ¹⁄₂ 0 1 1 12
611 ¹⁄₂ 51 11 ¹⁄₂ 1 0 0 13
617 ¹⁄₂ 51 5 ¹⁄₂ 0 1 0 13
621 ¹⁄₂ 51 9 ¹⁄₂ 2 0 0 13
627 ¹⁄₂ 52 3 ¹⁄₂ 1 1 0 13
635 ¹⁄₂ 52 11 ¹⁄₂ 0 0 1 13
645 ¹⁄₂ 53 9 ¹⁄₂ 1 0 1 13
647 ¹⁄₂ 53 11 ¹⁄₂ 0 0 0 14
651 ¹⁄₂ 54 3 ¹⁄₂ 0 1 1 13
657 ¹⁄₂ 54 9 ¹⁄₂ 1 0 0 14
663 ¹⁄₂ 55 3 ¹⁄₂ 0 1 0 14
667 ³⁄₄ 55 7 ³⁄₄ 2 0 0 14
673 ³⁄₄ 56 1 ³⁄₄ 1 1 0 14
681 ¹⁄₂ 56 9 ¹⁄₂ 0 0 1 14
691 ³⁄₄ 57 7 ³⁄₄ 1 0 1 14
693 ¹⁄₂ 57 9 ¹⁄₂ 0 0 0 15
697 ³⁄₄ 58 1 ³⁄₄ 0 1 1 14
703 ³⁄₄ 58 7 ³⁄₄ 1 0 0 15
709 ³⁄₄ 59 1 ³⁄₄ 0 1 0 15
714 59 6 2 0 0 15
720 60 0 1 1 0 15
727 ³⁄₄ 60 7 ³⁄₄ 0 0 1 15
738 61 6 1 0 1 15
739 ³⁄₄ 61 7 ³⁄₄ 0 0 0 16
744 62 0 0 1 1 15
11 0 11 1 0 0 0
17 1 5 0 1 0 0
21 ¹⁄₄ 1 9 ¹⁄₄ 2 0 0 0
27 ¹⁄₄ 2 3 ¹⁄₄ 1 1 0 0
35 2 11 0 0 1 0
47 3 11 0 0 0 1
51 ¹⁄₄ 4 3 ¹⁄₄ 0 1 1 0
57 ¹⁄₄ 4 9 ¹⁄₄ 1 0 0 1
63 ¹⁄₄ 5 3 ¹⁄₄ 0 1 0 1
67 ¹⁄₄ 5 7 ¹⁄₄ 2 0 0 1
73 ¹⁄₄ 6 1 ¹⁄₄ 1 1 0 1
81 ¹⁄₄ 6 9 ¹⁄₄ 0 0 1 1
93 ¹⁄₄ 7 9 ¹⁄₄ 0 0 0 2
97 ¹⁄₄ 8 1 ¹⁄₄ 0 1 1 1
102 ¹⁄₂ 8 6 ¹⁄₂ 1 0 0 2
109 ¹⁄₄ 9 1 ¹⁄₄ 0 1 0 2
113 ¹⁄₂ 9 5 ¹⁄₂ 2 0 0 2
119 ¹⁄₂ 9 11 ¹⁄₂ 1 1 0 2
127 ¹⁄₄ 10 7 ¹⁄₄ 0 0 1 2
137 ¹⁄₂ 11 5 ¹⁄₂ 1 0 1 2
139 ¹⁄₄ 11 7 ¹⁄₄ 0 0 0 3
143 ¹⁄₂ 11 11 ¹⁄₂ 0 1 1 2
149 ¹⁄₂ 12 5 ¹⁄₂ 1 0 0 3
155 ¹⁄₂ 12 11 ¹⁄₂ 0 1 0 3
159 ³⁄₄ 13 3 ³⁄₄ 2 0 0 3
165 ³⁄₄ 13 9 ³⁄₄ 1 1 0 3
173 ¹⁄₂ 14 5 ¹⁄₂ 0 0 1 3
183 ³⁄₄ 15 3 ³⁄₄ 1 0 1 3
185 ¹⁄₂ 15 5 ¹⁄₂ 0 0 0 4
189 ³⁄₄ 15 9 ³⁄₄ 0 1 1 3
195 ³⁄₄ 16 3 ³⁄₄ 1 0 0 4
201 ³⁄₄ 16 9 ³⁄₄ 0 1 0 4
206 17 2 2 0 0 4
212 17 8 1 1 0 4
219 ³⁄₄ 18 3 ³⁄₄ 0 0 1 4
230 19 2 1 0 1 4
231 ³⁄₄ 19 3 ³⁄₄ 0 0 0 5
236 19 8 0 1 1 4
242 20 2 1 0 0 5
248 20 8 0 1 0 5
252 21 0 2 0 0 5
258 21 6 1 1 0 5
266 22 2 0 0 1 5
276 23 0 1 0 1 5
278 23 2 0 0 0 6
282 23 6 0 1 1 5
288 24 0 1 0 0 6
294 ³⁄₄ 24 6 ³⁄₄ 0 1 0 6
298 ¹⁄₄ 24 10 ¹⁄₄ 2 0 0 6
304 ¹⁄₄ 25 4 ¹⁄₄ 1 1 0 6
312 26 0 0 0 1 6
322 ¹⁄₄ 26 10 ¹⁄₄ 1 0 1 6
324 27 0 0 0 0 7
328 ¹⁄₄ 27 4 ¹⁄₄ 0 1 1 6
334 ¹⁄₄ 27 10 ¹⁄₄ 1 0 0 7
340 ¹⁄₄ 28 4 ¹⁄₄ 0 1 0 7
344 ¹⁄₂ 28 8 ¹⁄₂ 2 0 0 7
350 ¹⁄₂ 29 2 ¹⁄₂ 1 1 0 7
358 ¹⁄₄ 29 10 ¹⁄₄ 0 0 1 7
368 ¹⁄₂ 30 8 ¹⁄₂ 1 0 1 7
370 ¹⁄₄ 30 10 ¹⁄₄ 0 0 0 8
374 ¹⁄₂ 31 2 ¹⁄₂ 0 1 1 7
380 ¹⁄₂ 31 8 ¹⁄₂ 1 0 0 8