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56149J
9
VenTing inSTallaTion
Continued
Figure 12 - Ceiling Support Pipe 12S-8DM
Straps
Straps
Straps
Straps
Detail A
Return Elbow
Detail B
Angle Firestop
See Detail A
See Detail B
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 11, page 8).
4. All pipe connections between offset and
return must be secured with two screws
on the outer pipe only (see Figure 13). Do
not penetrate 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
Figure 13 - Elbow Offset
B
A
Screws
FIRESTOP SPACERS (FS-8DM)
Firestop spacers are required at each point
where chimney penetrates a floor space.
Their purpose is to establish and maintain
the required clearance between chimney and
combustible materials.
When pipe passes through a framed open
-
ing into a living space above, firestop must
be placed onto ceiling from below as shown
in Figure 14.
Figure 14 - Firestop Spacer with Living
Space Above Ceiling
Existing
Ceiling
Frame
Firestop
Spacer
Screws or
Staples
(Min. of 8)