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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 ( see
Figure 37 ). 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 sys-
tem 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.
Height Of
Chimney Only
Inches
Feet/Inches 12" 18" 36" 48"
11
17
21 ¹⁄₄
27 ¹⁄₄
35
47
51 ¹⁄₄
57 ¹⁄₄
63 ¹⁄₄
67 ¹⁄₄
73 ¹⁄₄
81 ¹⁄₄
93 ¹⁄₄
97 ¹⁄₄
102 ¹⁄₂
109 ¹⁄₄
113 ¹⁄₂
119 ¹⁄₂
127 ¹⁄₄
137 ¹⁄₂
139 ¹⁄₄
143 ¹⁄₂
149 ¹⁄₂
155 ¹⁄₂
159 ³⁄₄
165 ³⁄₄
173 ¹⁄₂
183 ³⁄₄
185 ¹⁄₂
189 ³⁄₄
195 ³⁄₄
201 ³⁄₄
206
212
219 ³⁄₄
230
231 ³⁄₄
236
242
248
12
OFFSET CALCULATIONS
Step 1. Use Offset Chart to determine amount
of horizontal offset (A) and height (B) for
various 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 sta-
bilizers as required. Firestop spacers must be
used as shown in Figures 19 and 20 and
stabilizers as shown in Figure 26 .
FTF8 VERTICAL ELEVATION CHART
Number Of FTF8
Chimney Lengths
0 11
1
0
0
0
1
5
0
1
0
0
9 ¹⁄₄
1
2
0
0
0
3 ¹⁄₄
2
1
1
0
0
2 11
0
0
1
0
3 11
0
0
0
1
3 ¹⁄₄
4
0
1
1
0
9 ¹⁄₄
4
1
0
0
1
3 ¹⁄₄
5
0
1
0
1
7 ¹⁄₄
5
2
0
0
1
1 ¹⁄₄
6
1
1
0
1
9 ¹⁄₄
6
0
0
1
1
9 ¹⁄₄
7
0
0
0
2
1 ¹⁄₄
8
0
1
1
1
6 ¹⁄₂
8
1
0
0
2
1 ¹⁄₄
9
0
1
0
2
5 ¹⁄₂
9
2
0
0
2
9 11 ¹⁄₂
1
1
0
2
7 ¹⁄₄
10
0
0
1
2
5 ¹⁄₂
11
1
0
1
2
7 ¹⁄₄
11
0
0
0
3
11 11 ¹⁄₂
0
1
1
2
5 ¹⁄₂
12
1
0
0
3
12 11 ¹⁄₂
0
1
0
3
3 ³⁄₄
13
2
0
0
3
9 ³⁄₄
13
1
1
0
3
5 ¹⁄₂
14
0
0
1
3
3 ³⁄₄
15
1
0
1
3
5 ¹⁄₂
15
0
0
0
4
9 ³⁄₄
15
0
1
1
3
3 ³⁄₄
16
1
0
0
4
9 ³⁄₄
16
0
1
0
4
17
2
2
0
0
4
17
8
1
1
0
4
3 ³⁄₄
18
0
0
1
4
19
2
1
0
1
4
3 ³⁄₄
19
0
0
0
5
19
8
0
1
1
4
20
2
1
0
0
5
20
8
0
1
0
5
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
Height Of
Height Of
Chimney Only
Chimney Only
MM
M
Inches
Feet/Inches 12" 18" 36" 48"
279
0.28
252
21
432
0.43
258
21
540
0.54
266
22
692
0.69
276
23
889
0.89
278
23
1194
1.19
282
23
1302
1.30
288
24
294 ³⁄₄
1454
1.45
24
298 ¹⁄₄
24 10 ¹⁄₄
1607
1.61
304 ¹⁄₄
1708
1.71
25
1861
1.86
312
26
322 ¹⁄₄
26 10 ¹⁄₄
2064
2.06
2369
2.37
324
27
328 ¹⁄₄
2470
2.47
27
334 ¹⁄₄
27 10 ¹⁄₄
2604
2.60
340 ¹⁄₄
2775
2.78
28
344 ¹⁄₂
2883
2.88
28
350 ¹⁄₂
3035
3.04
29
358 ¹⁄₄
29 10 ¹⁄₄
3232
3.23
368 ¹⁄₂
3493
3.49
30
370 ¹⁄₄
30 10 ¹⁄₄
3537
3.54
374 ¹⁄₂
3645
3.65
31
380 ¹⁄₂
3797
3.80
31
386 ¹⁄₂
3950
3.95
32
390 ³⁄₄
4058
4.06
32
396 ³⁄₄
4210
4.21
33
404 ¹⁄₂
4407
4.41
33
414 ³⁄₄
4667
4.67
34
416 ¹⁄₂
4712
4.71
34
420 ³⁄₄
4820
4.82
35
426 ³⁄₄
4972
4.97
35
432 ³⁄₄
5124
5.12
36
5232
5.23
437
36
5385
5.39
443
36 11
450 ³⁄₄
5582
5.58
37
5842
5.84
461
38
462 ³⁄₄
5886
5.89
38
466 ³⁄₄
38 10 ³⁄₄
5994
5.99
472 ³⁄₄
6147
6.15
39
478 ³⁄₄
39 10 ³⁄₄
6299
6.30
20'
Max.
B
1
Figure 34
Number Of FTF8
Height Of
Chimney Lengths
Chimney Only
MM
0
2
0
0
5
6401
6
1
1
0
5
6553
2
0
0
1
5
6756
0
1
0
1
5
7010
2
0
0
0
6
7061
6
0
1
1
5
7163
0
1
0
0
6
7315
6 ³⁄₄
0
1
0
6
7487
2
0
0
6
7576
4 ¹⁄₄
1
1
0
6
7728
0
0
0
1
6
7925
1
0
1
6
8185
0
0
0
0
7
8230
4 ¹⁄₄
0
1
1
6
8338
1
0
0
7
8490
4 ¹⁄₄
0
1
0
7
8642
8 ¹⁄₂
2
0
0
7
8750
2 ¹⁄₂
1
1
0
7
8903
0
0
1
7
9100
8 ¹⁄₂
1
0
1
7
9360
0
0
0
8
9404
2 ¹⁄₂
0
1
1
7
9512
8 ¹⁄₂
1
0
0
8
9665
2 ¹⁄₂
0
1
0
8
9817
6 ³⁄₄
2
0
0
8
9925
0 ³⁄₄
1
1
0
8
10077
8 ¹⁄₂
0
0
1
8
10274
6 ³⁄₄
1
0
1
8
10535
8 ¹⁄₂
0
0
0
9
10579
0 ³⁄₄
0
1
1
8
10687
6 ³⁄₄
1
0
0
9
10839
0 ³⁄₄
0
1
0
9
10992
5
2
0
0
9
11100
1
1
0
9
11252
6 ³⁄₄
0
0
1
9
11449
5
1
0
1
9
11709
6 ³⁄₄
0
0
0
10
11754
0
1
1
9
11855
4 ³⁄₄
1
0
0
10
12008
0
1
0
10
12160
A
1
Return
Elbow
Stabilizer
10' Max.
Offset
Elbow
M
6.40
6.55
6.76
7.01
7.06
7.16
7.32
7.49
7.58
7.73
7.93
8.19
8.23
8.34
8.49
8.64
8.75
8.90
9.10
9.36
9.40
9.51
9.67
9.82
9.93
10.08
10.27
10.53
10.58
10.69
10.84
10.99
11.10
11.25
11.45
11.71
11.75
11.86
12.01
12.16
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