NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
13
Figure 36
A
1
C
1
B
1
B
2
C
2
A
2
A
1
C
1
B
1
B
2
C
2
A
2
Figure 37
Chimney
Section
Joints
No. 8 x 1/2" SMS
Screws Required At
Ever
y Joint Past 6'
No Screws Required In
Joints For First 6' of Offset
4'
6'
FTF13 OFFSET ELEVATION CHART
A
B
FTF13-ES30
Number of FTF13
A
B
Offset
Height
Offset/Return
FTF13-S4
Chimney Sections
Offset
Height
(Inches)
(Inches)
Elbow Set
Stabilizer
12"
18"
36"
(mm)
(mm)
4
15
³⁄₄
1
0
0
0
0
102
400
9
24
¹⁄₂
1
0
1
0
0
229
622
12
29
³⁄₄
1
0
0
1
0
305
756
14
¹⁄₄
33
¹⁄₂
1
0
2
0
0
362
851
17
¹⁄₄
38
¹⁄₂
1
0
1
1
0
438
978
20
¹⁄₄
43
³⁄₄
1
0
0
2
0
514
1111
21
45
¹⁄₄
1
0
0
0
1
533
1149
22
¹⁄₄
47
¹⁄₂
1
0
2
1
0
565
1207
25
¹⁄₄
52
¹⁄₂
1
0
1
2
0
641
1334
26
¹⁄₄
54
¹⁄₄
1
0
1
0
1
667
1378
28
¹⁄₄
57
³⁄₄
1
0
0
3
0
718
1467
29
¹⁄₄
59
¹⁄₄
1
0
0
1
1
743
1505
31
¹⁄₄
63
1
0
2
0
1
794
1600
32
¹⁄₂
65
1
0
4
1
0
826
1651
34
¹⁄₄
68
¹⁄₄
1
0
1
1
1
870
1734
36
¹⁄₄
71
³⁄₄
1
0
3
0
1
921
1822
37
¹⁄₄
73
¹⁄₄
1
0
0
2
1
946
1861
38
¹⁄₄
75
1
0
0
0
2
972
1905
39
¹⁄₄
77
1
0
2
1
1
997
1956
41
¹⁄₂
80
¹⁄₂
1
0
1
4
0
1054
2045
43
¹⁄₄
83
³⁄₄
1
0
1
0
2
1099
2127
44
¹⁄₂
85
³⁄₄
1
0
3
1
1
1130
2178
45
¹⁄₄
87
¹⁄₂
1
0
0
3
1
1149
2223
46
¹⁄₄
89
1
0
0
1
2
1175
2261
48
¹⁄₄
91
¹⁄₂
1
0
2
0
2
1226
2324
49
¹⁄₂
94
¹⁄₂
1
0
1
5
0
1257
2400
51
¹⁄₄
97
³⁄₄
1
0
1
1
2
1302
2483
54
¹⁄₄
103
1
0
0
2
2
1378
2616
55
¹⁄₄
104
¹⁄₂
1
0
0
0
3
1403
2654
56
¹⁄₂
106
¹⁄₂
1
0
2
1
2
1435
2705
59
¹⁄₂
111
³⁄₄
1
0
1
2
2
1511
2838
61
³⁄₄
116
1
1
1
0
3
1568
2946
64
³⁄₄
121
¹⁄₄
1
1
0
1
3
1645
3080
67
124
³⁄₄
1
1
2
0
3
1702
3169
69
127
³⁄₄
1
1
1
3
2
1753
3245
70
130
1
1
1
1
3
1778
3302
73
135
¹⁄₄
1
1
0
2
3
1854
3435
75
138
³⁄₄
1
1
2
1
3
1905
3524
79
145
¹⁄₂
1
1
1
0
4
2007
3696
80
¹⁄₄
147
¹⁄₂
1
1
3
1
3
2038
3747
82
150
³⁄₄
1
1
0
1
4
2083
3829
87
159
¹⁄₂
1
1
1
1
4
2210
4051
INSTALLING OFFSETS
First, review the Offset Elevation Chart and see
Figure 39 for reference.
Step 1. Determine the offset distance where
chimney is to pass through the first ceiling-
dimension “A.” To find this point on your ceil-
ing, first determine the center point for a verti-
cal chimney following the instructions for ver-
tical installation.
Measure height to the ceiling from the top of
fireplace-dimension “B.” Use the appropriate
Offset Elevation Chart to find dimension “A.”
Mark point where you will drive your nail to
show the center point for your offset ceiling cut.
Step 2. Proceed by using the Straight Up Instal-
lation Instructions for cutting and framing ceil-
ing and roof openings.
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