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