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INSTRUCTIONS WHEN OFFSET OF CHIMNEY IS
NEEDED
TO INSTALL ELBOWS
1. To achieve desired offset, you may install combinations of 12",
18", 36", and 48" lengths of double wall pipe (see Rise and
Offsets chart and Figures 23 and 25).
2. Chimney weight above offset rests on return elbow. Straps must be
securely nailed to rafters or joists (see Figure 24 details A and B).
3. Maximum length of pipe supports (return elbow or V12S-8DM)
is 6' of angled run. Maximum of two (2) 6' angled run sections
per chimney system (see Figure 25).
NOTE: ANY OFFSET GREATER THAN 6 FEET MUST USE A
V12S-8DM. ALSO FOR STRAIGHT RUN OVER 30 FT. LEVEL.
f i r e - p a r t s . c o m
A
All joints between offset shall be secured with two screws,
only on the outer pipe, and shall not penetrate the inner
stainless. See illustration above.
Figure 23
OFFSET
ELBOW
RETURN
ELBOW
OFFSET
ELBOW
Figure 25
55510
B
RETURN
ELBOW
6' MAX
OFFSET
ELBOW
6' MAX
OFFSET
ELBOW
A
TYPICAL OFFSET INSTALLATION
RISE AND OFFSETS
A
B
48 36 18 12
3
3
4
/
16
/
8
8
3
1
9
/
25
/
4
2
12
3
/
30
3
/
4
4
3
15
34
/
4
18
40
21
1
/
46
1
/
1
4
4
23
3
/
49
1
/
4
4
3
3
27
/
56
/
1
4
4
3
30
60
/
1
4
33
66
1
36
71
1
1
38
/
75
2
4
CEILING
SUPPORT
PIPE
V12S-8DM
DETAIL B
RETURN
DETAIL A
Figure 24
RETURN
ELBOW
6' MAX
RETURN
ELBOW
6' MAX
OFFSET
ELBOW
B
9
A
B
48
36 18 12 12S
1
1
41
/
80
/
1
4
4
3
1
45
86
/
2
4
1
46
3
/
89
1
/
1
4
2
2
51
97
1
1
1
1
1 53
/
101
2
4
56
1
/
106
1
/
2
4
4
1
2 59
1
/
111
1
/
1
1
4
2
3
1
61
/
115
/
2
4
2
3
3
1
64
/
120
/
2
4
4
1 68
1
/
127
1
2
4
1
70
130
2
1
1
74
/
137
/
1
2
4
2
76
3
/
141
1
/
1
2
4
2
79
3
/
146
3
/
4
4
4
2"
MINIMUM
ANGLE
FIRESTOP
DETAIL B
ELBOW
INSTALL SUPPORT 12S-8DM
CEILING
SUPPORT
PIPE
V12S-8DM
6' MAX
6' MAX
C
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
SEE
DETAIL A
SEE
RETURN
ELBOW
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