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Figure 14 - Firestop Spacer with Living
Space Above Ceiling
Firestop
Spacer
Figure 15 - Firestop Spacer with Attic
Space Above Ceiling
and 12" length of pipe. A chimney support is
required every 30 feet above fireplace after a
straight chimney run or above a return elbow
after a straight chimney run (see Figure 16).
This support is designed to relieve the extra
weight load on firebox and elbows when high
chimneys are installed.
ELBOW OFFSET INSTALLATION
12S-8DM
Support
Required
30 FT.
(9.14m)
Figure 16 - Elbow Offset
Chimney weight above offset rests on return
elbow. Straps must be securely nailed to
rafters or joists (see Figure 17).
To achieve desired offset, you may install
8
VenTing inSTALLATion
Continued
Existing
Ceiling
Frame
Firestop
Spacer
Screws or
Staples
(Min. of 8)
Screws or Staples
(Min. of 8)
Existing
Ceiling
Frame
30 FT.
(9.14m)
Return
Elbow
www.desatech.com
combinations of 12", 18", 36" and 48" length
of double wall pipe (see offset chart and
Figure 18).
Maximum length of pipe between supports
2" (5.1cm)
Minimum
2" (5.1cm)
Minimum
Ceiling
Support
Straps
Return
Elbow
Figure 17 - Chimney Supports
Screws
OFFSET
RISE
A
B
4
/
"
16
/
"
3
3
8
8
9
/
"
25
/
"
1
1
2
4
12
/
"
30
/
"
1
3
2
8
14
/
"
34"
3
8
17
/
"
39
/
"
5
1
8
4
21
/
"
46"
1
2
22
/
"
48
/
"
3
1
4
8
26
/
"
54
/
"
3
7
8
8
26
/
"
60"
3
8
31
/
"
63
/
"
3
3
4
4
34
/
"
69"
3
4
38
/
"
75
/
"
5
5
8
8
39
/
"
77
/
"
7
7
8
8
43
/
"
84
/
"
3
1
4
2
46
/
"
87
/
"
3
3
4
4
48
/
"
93
/
"
7
3
8
8
Figure 18 - Rise and Offset
Angled Firestop
B
A
ChIMNEY LENGTh
48"
36"
18"
12"
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
2
1
2
1
2
1
2
1
1
55511E
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