Venting installation, Continued, Using elbow offsets (30e-8dm) – FMI S42 User Manual
Page 7
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111099-01L
7
VENTING INSTALLATION
Continued
Continue to assemble chimney sections as
outlined, making sure that both the inner and
outer pipe sections are locked together. When
installing double wall snap-lock chimney
together, it is important to assure the joint be-
tween the chimney sections is locked. Check
by pulling chimney upward after locking. The
chimney will not come apart if properly locked.
It is not necessary to add screws to keep
chimney together (exception - see Figure 9,
page 8).
USING ELBOW OFFSETS (30E-8DM)
1. To achieve desired offset, you may install
combinations of 12", 18", 24", 36" and 48"
length of double wall pipe (see offset chart
and Figure 7).
2. Chimney weight above offset rests on
return elbow. Straps must be securely
nailed to rafters or joists (see Figure 8,
details A and B on page 8).
3. Maximum length of pipe between supports
(return elbow or 12S-8DM) is 6' of angle
run. Maximum of two 6' angle run sections
per chimney system (see Figure 7).
4. All pipe connections between the offset
and return must be secured with two
screws on the outer pipe only (see Figure
9, page 8). Do not penetrate the inner
stainless.
OFFSET RISE
CHIMNEY LENGTH
A
B
48" 36" 24" 18" 12"
4
3
/
8
"
16
3
/
8
"
ELBOW SET ONLY
9
3
/
4
"
25
1
/
2
"
1
12
3
/
4
" 30
3
/
4
"
1
15"
34
3
/
4
"
1
18"
40"
1
1
21
1
/
4
" 46
1
/
4
"
1
23
3
/
4
" 49
1
/
4
"
1
1
27
3
/
4
" 56
3
/
4
"
1
30"
60
3
/
4
"
1
1
33"
66"
1
1
36"
71"
1
1
38
1
/
4
"
75"
2
41
1
/
4
" 80
1
/
4
"
1
1
1
45"
86
3
/
4
"
2
46
3
/
4
" 89
1
/
2
"
1
1
1
51"
97"
1
1
53
1
/
4
"
101"
2
1
56
1
/
4
" 106
1
/
4
" 2
59
1
/
4
" 111
1
/
2
" 1
1
1
61
3
/
4
" 115
1
/
2
" 2
1
64
3
/
4
" 120
3
/
4
" 2
1
68
1
/
4
"
127"
1
2
70"
130"
2
1
1
74
1
/
4
" 137
1
/
2
" 1
2
1
76
3
/
4
" 141
1
/
2
" 1
2
1
79
3
/
4
" 146
3
/
4
"
4
OFFSET CHART (22-50 FT. SYSTEM HEIGHT)
Figure 7 - Typical Offset Terminations
Return
Elbow
Offset
Elbow
Return
Elbow
Offset
Elbow
6' Max.
6' Max.
6' Max.
6' Max.
6' Max.
6' Max.
Return
Elbow
Offset
Elbow
Offset
Elbow
Return
Elbow
A
B
C
Offset
Elbow
Ceiling
Support Pipe
12S-8DM
Return
Elbow