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122273-01A 9
VENTING INSTALLATION
Continued
RISE
A B 12" 18" 24" 36" 48"
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
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
56
1
/
4
" 106
1
/
4
"
2
59
1
/
4
" 111
1
/
2
"
1 1 1
61
3
/
4
" 115
1
/
2
"
1 2
64
3
/
4
" 120
3
/
4
"
1 2
68
1
/
4
" 127"
2 1
70" 130"
1 1 2
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 11 - Ceiling Support Pipe
12S-12DM
2" Min.
Straps
Straps
Straps
Straps
Detail A
Return Elbow
Detail B
Angle Firestop
See Detail A
See Detail B
if properly locked. It is not necessary to add
screws to keep the chimney together (excep-
tion, see Figure 10).
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 10).
Figure 10 - Elbow Offset
B
A
Screws
2.
Chimney weight above offset rests on
return elbow. Straps must be securely
nailed to rafters or joists (see Figure 11,
details A and B).
3. Maximum length of pipe between sup-
ports (return elbow or 12S-12DM) is 6'
of angle run. Maximum of two 6' angle
run sections per chimney system (see
Figure 12, page 10).
4. All pipe connections between the offset
and return must be secured with two
screws on the outer pipe only (see
Figure 10). Do not penetrate the inner
stainless.