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OFFSET CHART WITH TRANSITION PIPE
OFFSET
RISE
OFFSET/
RETURN
A
B
ELBOW
13
/
"
32
/
"
1
3
1
4
2
19"
41"
1
22"
46
/
"
1
3
4
24
/
"
50
/
"
1
1
3
2
4
27
/
"
56
1
1
2
30
/
"
61
1
1
4
31
62
/
"
1
1
2
32
/
"
65"
1
1
2
35
/
"
70
/
"
1
1
1
2
4
36
/
"
71
/
"
1
1
1
4
2
37
72
/
"
1
3
4
38
/
"
75
/
"
1
1
1
2
2
39
/
"
76
/
"
1
1
3
4
4
41
/
"
80
/
"
1
1
1
2
2
42
/
"
81
/
"
1
1
3
4
4
44
/
"
85
/
"
1
1
3
2
4
45
/
"
87"
1
1
4
47
/
"
91"
1
1
2
48
/
"
92
/
"
1
1
1
4
4
49
/
"
94
/
"
1
3
3
4
4
52"
98
/
"
1
3
4
53
/
"
101
/
"
1
1
1
2
4
54
/
"
102
/
"
1
1
3
4
4
55
/
"
105
/
"
1
3
1
4
4
56
/
"
106
/
"
1
1
1
2
2
58
/
"
110
/
"
1
3
1
4
2
59
/
"
111
/
"
1
1
3
2
4
60
/
"
113"
1
1
4
61
/
"
115
/
"
1
3
3
4
4
64
/
"
120
/
"
1
3
3
4
4
65
/
"
122
/
"
1
1
1
2
4
67"
124
/
"
1
3
4
Screws
Figure 12 - Elbow Offset
10
VENTING INSTALLATION Continued
TRANSITION
CHIMNEY LENGTH
PIPE
12"
18"
36"
1
1
1
1
1
1
2
1
1
1
1
2
1
1
1
2
1
1
1
2
1
1
1
1
1
3
1
1
1
1
2
1
1
1
1
1
1
1
1
1
1
2
1
1
2
1
2
1
1
1
1
4
1
1
2
1
1
1
3
1
1
1
2
1
2
2
1
1
1
1
1
1
1
2
1
2
2
1
1
1
2
1
2
B
A
SuperiorFireplaces.us.com
FIRESTOP SPACERS (3600FS-8DM-1)
Firestop spacers are required at each point where chimney penetrates
a floor space. Their purpose is to establish and maintain required
48"
clearance between chimney and combustible materials. When pipe
passes through a framed opening into a living space above, firestop
must be placed onto ceiling from below as shown in Figure 13.
1
They also provide complete separation from one floor space to an-
other or attic space as required by most codes. When double wall
pipe passes through a framed opening into an attic space, firestop
must be placed into an attic floor as shown in Figure 14, page 12.
If area above is a living space, install firestop below framed hole.
1
1
Figure 13 - Firestop Spacer with Living Space Above Ceiling
1
If area above is an attic or insulated area, install firestop above
1
1
Figure 14 - Firestop Spacer with Attic Space Above Ceiling
2
2
When penetrating a ceiling into an attic, a firestop
thimble (38FST or FST30) is required to avoid intru-
sion by insulation and recommended to negotiate a
joist (see Figure 14a).
Figure 14a - Firestop Thimble
framed hole.
IMPORTANT NOTICE
Thimble
38FST or
FST30
Firestop
126622-01_L
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