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Continue to assemble chimney sections as
outlined above, making sure that both inner
and outer pipe sections are locked together.
When installing double wall snap-lock chim-
ney together, it is important to assure the joint
between 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 7).
OFFSET
RISE
A
B
12"
4
/
"
16
/
"
3
3
8
8
9
/
"
25
/
"
1
3
1
4
2
12
/
"
30
/
"
3
3
4
4
15"
34
/
"
3
4
18"
40"
1
21
/
"
46
/
"
1
1
4
4
23
/
"
49
/
"
3
1
4
4
27
/
"
56
/
"
3
3
4
4
30"
60
/
"
3
4
33"
66"
1
36"
71"
38
/
"
75"
1
4
41
/
"
80
/
"
1
1
1
4
4
45"
86
/
"
3
4
46
/
"
89
/
"
1
3
1
4
2
51"
97"
53
/
"
101"
1
4
56
/
" 106
/
"
1
1
4
4
59
/
" 111
/
"
1
1
4
2
61
/
" 115
/
"
1
3
1
4
2
64
/
" 120
/
"
3
3
4
4
68
/
"
127"
1
4
70"
130"
1
74
/
" 137
/
"
1
1
1
4
2
76
/
" 141
/
"
3
1
4
2
79
/
" 146
/
"
3
3
4
4
OFFSET CHART (22-50 FT. SYSTEM HEIGHT)
Screws
A
Figure 7 - Elbow Offset
116010-01E
VenTing insTallaTion
CHIMNEY LENGTH
18"
24"
36"
ELBOW SET ONLY
1
1
1
1
1
1
1
1
1
2
1
1
2
1
1
1
2
1
1
1
2
1
2
1
2
4
B
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Continued
USING ELBOW OFFSETS (30E-12DM)
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).
3. Maximum length of pipe between sup-
ports (return elbow or 12S-12DM) is 6'
48"
of angle run. Maximum of two 6' angle
run sections per chimney system (see
Figure 9, page 8).
4. All pipe connections between offset and
return must be secured with two screws
on outer pipe only (see Figure 7). Do not
penetrate inner stainless.
1
1
1
Straps
1
Detail B
1
Angle Firestop
2
1
2
2
Straps
1
2
Detail A
1
Return Elbow
1
Figure 8 - Ceiling Support Pipe
2" Min.
Straps
See Detail B
Straps
12S-12DM
See Detail A
7
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