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VenTing insTallaTion
Continued
Maximum length of pipe between supports
is 6' of angle run. Maximum of two 6' angle
run sections per chimney system (see Figure
9, page 6).
12S-12DM
Support
Required
30 FT.
(9.14m)
Figure 15 - Elbow Offset
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
OFFSET CHART
Screws
Figure 16 - Rise and Offset
8
Return
Elbow
ChIMNEY LENGTh
48"
36"
18"
12"
ELBOW SET ONLY
1
1
1
1
1
1
1
1
1
1
1
1
2
1
1
1
1
2
1
2
B
A
www.desatech.com
2" (5.1cm)
Minimum
2" (5.1cm)
Minimum
Straps
30 FT.
(9.14m)
Figure 17 - Chimney Supports
6' Max.
(15.2 cm)
6' Max.
(15.2 cm)
2
1
2
Figure 18 - Typical Offset Installations
FIRESTOP SPACERS (FS-10)
Firestop spacers are required at each point
1
where the chimney penetrates a floor or ceiling
joist space. Their purpose is to establish and
maintain the required clearance between the
chimney and the combustible materials.
When penetrating a floor or ceiling at an angle,
use firestop spacer number 30 FS-10D (see
Replacement and Accessory Parts, page 15).
When the pipe passes through a framed open-
ing into a living space above, the firestop must
be placed onto the ceiling from below as shown
in Figure 19, page 9. When the pipe passes
through a framed opening into an attic space
above, the firestop must be placed on the attic
floor as shown in Figure 20, page 9.
Angled Firestop
Ceiling
Support
Return
Elbow
6' Max.
(15.2 cm)
6' Max.
(15.2 cm)
6' Max.
(15.2 cm)
6' Max.
(15.2 cm)
115607-01C
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