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126610-01A
9
blown insulation to fill chimney enclosure.
SUPPORT SECTIONS (12S-8DM)
The chimney support section is a 4" strap 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
VENTING INSTALLATION
Continued
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
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 combinations of 12", 18",
36" and 48" length of double wall pipe (see offset chart and Figure 18).
Maximum length of pipe between supports is 6 feet of angled run. A
Figure 18 - Raise and Offset
B
A
Screws
Figure 16 - Elbow Offset
30 FT.
(9.14m)
30 FT.
(9.14m)
Return
Elbow
12S-8DM
Support
Required
Figure 17 - Chimney Supports
2" (5.1cm)
Minimum
Straps
2" (5.1cm)
Minimum
Angled Firestop
Ceiling
Support
Return
Elbow
OFFSET
RISE
CHIMNEY LENGTH
A
B
48" 36" 18" 12"
4
3
/
8
"
16
3
/
8
"
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
"
1
1
21
1
/
2
"
46"
1
22
3
/
4
"
48
1
/
8
"
1
2
26
3
/
8
"
54
7
/
8
"
1
26
3
/
8
"
60"
1
1
31
3
/
4
"
63
3
/
4
"
1
1
34
3
/
4
"
69"
1
1
38
5
/
8
"
75
5
/
8
"
2
39
7
/
8
"
77
7
/
8
"
1
1
1
43
3
/
4
"
84
1
/
2
"
1
1
46
3
/
4
"
87
3
/
4
"
2
1
48
7
/
8
"
93
3
/
8
"
2
TYPICAL OFFSET INSTALLATIONS
OFFSET
ELBOW
OFFSET
ELBOW
RETURN
ELBOW
OFFSET
ELBOW
RETURN
ELBOW
RETURN
ELBOW
RETURN
ELBOW
CEILING
SUPPORT
PIPE
V12S-8DM
6' MAX
(15.2cm)
6' MAX
(15.2cm)
6' MAX
(15.2cm)
6' MAX
(15.2cm)
6' MAX
(15.2cm)
6' MAX
(15.2cm)
Figure 19 - Typical Offset Installations
