Offsets and rise, Instructions when offset of chimney is needed – Desa C42EC2 User Manual
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OFFSETS AND RISE
A
B
48 36 18 12
A
B
48
36 18 12 12S
4
3
/
8
16
3
/
8
41
1
/
4
80
1
/
4
1
1
1
1
9
3
/
4
25
1
/
2
1
45 86
3
/
4
2
1
12
3
/
4
30
3
/
4
1
46
3
/
4
89
1
/
2
1
1
1
1
15 34
3
/
4
2
51
97
1
1
1
18
40
1
1 53
1
/
4
101
2
1
1
21
1
/
4
46
1
/
4
1
56
1
/
4
106
1
/
4
2
1
23
3
/
4
49
1
/
4
1
2 59
1
/
4
111
1
/
2
1
1
1
1
27
3
/
4
56
3
/
4
1
61
3
/
4
115
1
/
2
2
1
1
30 60
3
/
4
1
1
64
3
/
4
120
3
/
4
2
1
1
33
66
1
1 68
1
/
4
127
1
2
1
36
71
1
1
70
130
2
1
1
1
38
1
/
4
75
2
74
1
/
4
137
1
/
2
1
2
1
1
76
3
/
4
141
1
/
2
1
2
1
1
79
3
/
4
146
3
/
4
4
1
A
B
Figure 18
CEILING
SUPPORT
PIPE
C12S-8DM
2"
MINIMUM
ANGLE
FIRESTOP
DETAIL B
SEE
DETAIL B
DETAIL A
SEE
DETAIL A
RETURN
ELBOW
Figure 19
OFFSET
ELBOW
OFFSET
ELBOW
OFFSET
ELBOW
OFFSET
ELBOW
OFFSET
ELBOW
RETURN
ELBOW
RETURN
ELBOW
RETURN
ELBOW
RETURN
ELBOW
CEILING
SUPPORT
PIPE
C12S-8DM
RETURN
ELBOW
6' MAX
6' MAX
6' MAX
6' MAX
6' MAX
6' MAX
A
B
C
Figure 20
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 Offsets and
Rise chart and Figures 18 and 20).
2.
Chimney weight above offset rests on return elbow. Straps must
be securely nailed to rafters or joists (see Figure 19, Details A
and B).
3.
Maximum length of pipe between supports (return elbow or
C12S-8DM) is 6’ of angled run. Maximum of two (2) 6’ angled
run sections per chimney system (see Figure 20).
NOTE:
ANY OFFSET GREATER THAN 6 FEET MUST USE A
C12S-8DM, ALSO FOR STRAIGHT RUN OVER 30 FT. LEVEL.
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.