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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
= 10' then C
1
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
metal screw located at the underside of the joint
( Figure 39 ).
A " diameter hole must be drilled in the chim-
ney joint using a " diameter drill. Hole should be
drilled in center of joint overlap ( Figure 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.
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.
cannot exceed 10'.
2
" sheet
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
FTF8 VERTICAL ELEVATION CHART
Height Of
Number Of FTF8
Chimney Only
Chimney Lengths
Inches
Feet/Inches 12" 18"
11
0 11
1
0
17
1
5
0
1
21
1
9
2
0
27
2
3
1
1
35
2 11
0
0
47
3 11
0
0
51
4
3
0
1
57
4
9
1
0
63
5
3
0
1
67
5
7
2
0
73
6
1
1
1
81
6
9
0
0
93
7
9
0
0
97
8
1
0
1
102
8
6
1
0
109
9
1
0
1
113
9
5
2
0
119
9 11
1
1
127
10
7
0
0
137
11
5
1
0
139
11
7
0
0
143
11 11
0
1
149
12
5
1
0
155
12 11
0
1
159
13
3
2
0
165
13
9
1
1
173
14
5
0
0
183
15
3
1
0
185
15
5
0
0
189
15
9
0
1
195
16
3
1
0
201
16
9
0
1
206
17
2
2
0
212
17
8
1
1
219
18
3
0
0
230
19
2
1
0
231
19
3
0
0
236
19
8
0
1
242
20
2
1
0
248
20
8
0
1
252
21
0
2
0
258
21
6
1
1
266
22
2
0
0
276
23
0
1
0
278
23
2
0
0
282
23
6
0
1
288
24
0
1
0
294
24
6
0
1
298
24 10
2
0
304
25
4
1
1
312
26
0
0
0
322
26 10
1
0
324
27
0
0
0
328
27
4
0
1
334
27 10
1
0
340
28
4
0
1
344
28
8
2
0
350
29
2
1
1
358
29 10
0
0
368
30
8
1
0
370
30 10
0
0
374
31
2
0
1
380
31
8
1
0
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 stabi-
lizers as shown in Figure 29 .
Height Of
Chimney Only
36" 48"
Inches
Feet/Inches 12" 18" 36" 48"
0
0
386
32
2
390
32
6
0
0
0
0
396
33
0
404
33
8
0
0
414
34
6
1
0
0
1
416
34
8
420
35
0
1
0
0
1
426
35
6
0
1
432
36
0
437
36
5
0
1
0
1
443
36 11
450
37
6
1
1
461
38
5
0
2
1
1
462
38
6
466
38 10
0
2
0
2
472
39 4
0
2
478
39 10
483
40
3
0
2
1
2
489
40
9
496
41
4
1
2
507
42
3
0
3
1
2
508
42
4
513
42
9
0
3
0
3
519
43
3
0
3
525
43
9
529
44
1
0
3
1
3
535
44
7
543
45
3
1
3
553
46
1
0
4
1
3
555
46
3
559
46
7
0
4
0
4
565
47
1
0
4
571
47
5
575
47 11
0
4
1
4
581
48
5
589
49
1
1
4
599
49 11
0
5
1
4
601
50
1
605
50
5
0
5
0
5
611
51 11
0
5
617
51
5
621
51
9
0
5
1
5
627
52
3
635
52 11
1
5
645
53
9
0
6
1
5
647
53 11
651
54
3
0
6
0
6
657
54
9
0
6
663
55
3
667
55
7
0
6
1
6
673
56
1
681
56
9
1
6
691
57
7
0
7
1
6
693
57
9
697
58
1
0
7
0
7
703
58
7
0
7
709
59
1
714
59
6
0
7
1
7
720
60
0
727
60
7
1
7
738
61
6
0
8
1
7
739
61
7
744
62
0
0
8
Number Of FTF8
Chimney Lengths
0
1
0
8
2
0
0
8
1
1
0
8
0
0
1
8
1
0
1
8
0
0
0
9
0
1
1
8
1
0
0
9
0
1
0
9
2
0
0
9
1
1
0
9
0
0
1
9
1
0
1
9
0
0
0
10
0
1
1
9
1
0
0
10
0
1
0
10
2
0
0
10
1
1
0
10
0
0
1
10
1
0
1
10
0
0
0
11
0
1
1
10
1
0
0
11
0
1
0
11
2
0
0
11
1
1
0
11
0
0
1
11
1
0
1
11
0
0
0
12
0
1
1
11
1
0
0
12
0
1
0
12
2
0
0
12
1
1
0
12
0
0
1
12
1
0
1
12
0
0
0
13
0
1
1
12
1
0
0
13
0
1
0
13
2
0
0
13
1
1
0
13
0
0
1
13
1
0
1
13
0
0
0
14
0
1
1
13
1
0
0
14
0
1
0
14
2
0
0
14
1
1
0
14
0
0
1
14
1
0
1
14
0
0
0
15
0
1
1
14
1
0
0
15
0
1
0
15
2
0
0
15
1
1
0
15
0
0
1
15
1
0
1
15
0
0
0
16
0
1
1
15
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