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CHIMNEY OFFSET INSTALLATION
Chimney Requirements - Offset Installations
Chimney Flue Exit
A
D
6 FT.
C
Offset
B
Hearth Floor
Example 1
Notes: G + H cannot exceed 20 feet.
*11CF Chimney airspace clearance = 2" minimum.
Illustration Key
The following safety rules apply to offset
installations (letters correspond with illustra-
tion above):
A. Height of the chimney is measured from
the hearth to the chimney exit.
SSTB11
Max.:
86'0"
Min.:
0 Elbows
18'0"
2 Elbows*
24'0"
4 Elbows*
30'0"
B. Do not use more than 4 elbows per chim-
ney.
Attach the straps of the return (top) elbow to a
structural framing member.
The offset (first) elbow of any pair does not
have straps.
Figure 16
87D0174
Chimney
Section
Elbow
B
G
E
Rise
H
Example 2
C. The chimney cannot be more than
30° from the vertical plane in any instal-
lation.
D. The maximum length of the angled
run of the total chimney system is 20
feet. (G plus H cannot exceed 20 feet.)
E. A chimney support (Model 11CS)
is required every 6 feet of angled run
of chimney. Chimney supports are
required for every 30 feet and 60 feet
chimney height above the hearth.
Determine the offset distance of your
chimney arrangement from the center-
line of the fireplace to the centerline of
the chimney where it is to pass through
the first ceiling.
NOTE: This offset distance may not be
your full offset distance. See Examples
2 and 3.
30°
Return
Elbow
G
30°
Offset
Elbow
11CS Sup-
port
30°
Return
Elbow
H
30°
Offset
Elbow
Example 3
FP269
IWF269
MBUF
5/16/96
rev. 5/25
SSTB11 Woodburning Fireplace
Offset
Rise
30° Elbow Offsets
1' 1¹⁄₂' 3' 4'
Offset
0 0 0 0
0
3"
1 0 0 0
0
8Z\₄"
0 1 0 0
0
11Z\₄"
2 0 0 0
0
13Z\x"
1 1 0 0
0
16Z\x"
0 0 1 0
0
20Z\₄"
2 1 0 0
0
21³\₄"
0 0 0 1
0
26Z\₄"
0 1 1 0
0
28Z\x"
1 0 0 1
0
31Z\x"
0 1 0 1
0
34Z\x"
0 0 2 0
0
37Z\x"
1 1 0 1
1
41Z\x"
0 0 1 1
1
45"
0 1 2 0
1
47Z\₄"
0 0 0 2
1
51"
0 1 1 1
1
53Z\₄"
0 0 3 0
1
56Z\₄" 103Z\₄"
0 1 0 2
1
59Z\₄" 108Z\x"
0 0 2 1
1
62Z\₄" 113Z\x"
0 1 3 0
1
64Z\x" 117Z\x"
0 0 1 2
1
68Z\₄"
0 1 2 1
1
70Z\x"
0 0 0 3
1
74Z\₄" 134Z\x"
0 1 1 2 2
78" 140³\₄"
0 0 3 1 2
81"
0 1 0 3 2
84" 151Z\₄"
0 0 2 2 2
87" 156Z\x"
0 1 3 1 2
89Z\₄" 160Z\₄"
0 0 1 3 2
93" 166³\₄"
0 1 2 2 2
95Z\₄" 170³\₄"
0 0 0 4 2
99Z\₄" 177³\₄"
0 1 1 3 2 101Z\₄" 181³\₄"
0 0 3 2 2 104Z\₄" 186Z\₄"
0 1 0 4 2 107Z\₄" 191Z\x"
0 0 2 3 2 110Z\₄" 196³\₄"
0 1 3 2 3
114" 203Z\₄"
0 0 1 4 3 117³\₄" 209³\₄"
0 1 2 3 3
120" 213Z\x"
0 0 0 5 3 123³\₄"
FP282
IWF282
MBUF
5/26/96
Rise
11"
20"
25Z\₄"
29Z\₄"
34Z\₄"
40³\₄"
43Z\x"
51Z\₄"
55Z\₄"
60Z\₄"
65Z\x"
70³\₄"
77³\₄"
83³\₄"
87Z\x"
94"
98"
124"
128"
146"
220"
15
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