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115603-01A
9
9
For more information, visit www.desatech.com
For more information, visit www.desatech.com
SUPPORT SECTIONS
The chimney support section is a 4-inch strap and 12 inch length of pipe.
A chimney support is required every 30 feet above the fireplace after a
straight chimney run, or above a return elbow after a straight chimney
run (see Figure 20). This support is designed to relieve the extra weight
load on the fireplace and elbows when high chimneys are installed.
To achieve desired offset, you may install combinations of 12, 18,
36, and 48 inch lengths of double wall pipe. See Figure 21 and Rise
and Offset Chart below.
VENTING INSTALLTION
Continued
Figure 17 - Firestop Spacer For Living Space
Figure 18 - Firestop Spacer for Attic Space
ELBOW OFFSET INSTALLATION
Chimney weight above offset rests on return elbow. Straps must be
secured with nails to rafters or joists (see Figure 19).
Figure 19 - Elbow Offset
Figure 20 - Chimney Supports
Figure 21 - Rise and Offset
FIRESTOP SPACERS
ELBOW OFFSET INSTALLATION
SUPPORT SECTIONS
Existing Ceiling
Frame
Living Space Above Ceiling
Firestop Spacer
Screw (8)
Firestop Spacer
Existing Ceiling
Frame
Attic Space
Above Ceiling
Screw (8)
30 FT.
(9.14m)
30 FT.
(9.14m)
Return
Elbow
12S-12DM
Support
Required
2" (5.1cm)
Minimum
A
B
Angled Firestop
Ceiling Support
Straps
Return
Elbow
RISE AND OFFSET CHART
A B Length of Pipe
(Offset) (Rise) 48 36 18 12
4
3
/
8
16
3
/
8
Elbow Set Only
9
1
/
2
25
1
/
4
1
12
1
/
2
30
3
/
8
1
14
3
/
8
34 2
17
5
/
8
39
1
/
4
11
21
1
/
2
46 1
22
3
/
4
48
1
/
8
12
26
3
/
8
54
7
/
8
1
26
3
/
8
60 1 1
31
3
/
4
63
3
/
4
11
34
3
/
4
69 1 1
38
5
/
8
75
5
/
8
2
39
7
/
8
77
7
/
8
111
43
3
/
4
84
1
/
2
11
46
3
/
4
87
3
/
4
21
48
7
/
8
93
3
/
8
2
Strap