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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 8).
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
RETURN
ELBOW
6' MAX
(15.2cm)
6' MAX
(15.2cm)
2
1
OFFSET
2
ELBOW
Figure 18 - Typical Offset Installations
1
FIRESTOP SPACERS (FS-10)
Firestop spacers are required at each point
where the chimney penetrates a floor or ceil-
ing joist space. Their purpose is to establish
and maintain the required clearance between
the chimney and the combustible materials.
When the pipe passes through a framed
opening into a living space above, the firestop
must be placed onto the ceiling from below as
shown in Figure 19, page 9.
They also provide complete separation from
one floor space to another or attic space as
required by most codes. When the double wall
pipe passes through a framed opening into an
attic space, the firestop must be placed into an
attic floor as shown in Figure 20, page 9.
When penetrating a floor or ceiling at an
angle, use firestop spacer number 30 FS-
10D (see Replacement and Accessory Parts,
page 15).
Angled Firestop
Ceiling
Support
Return
Elbow
CEILING
SUPPORT
PIPE
OFFSET
V12S-8DM
ELBOW
(15.2cm)
RETURN
ELBOW
6' MAX
(15.2cm)
TYPICAL OFFSET INSTALLATIONS
RETURN
ELBOW
6' MAX
(15.2cm)
OFFSET
ELBOW
6' MAX
RETURN
ELBOW
6' MAX
(15.2cm)
115603-01C
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