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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.
Air Space Clearances: SK8 (2-wall) = 1Z\x" and "S" Series (3-wall) = 2"
Illustration Key
The following safety rules apply to
offset installations (letters correspond
with illustration above):
A. Height of the chimney is measured
from the hearth to the chimney exit.
WMC36
Maximum:
90'
Minimum:
Without Elbows 12' 6"
With 2 Elbows* 15' 0"
With 4 Elbows* 21' 0"
b. Do not use more than 4 elbows per
chimney.
Attach the straps of the return (top)
elbow to a structural framing member.
The offset (first) elbow of any pair does
not have straps.
* In Canada, two (2) SK845 are allowed.
Fig. 4 Chimney system requirements.
20000583
CHIMNEY
SECTION
ELBOW
B
G
E
RISE
H
Example 2
C. The chimney cannot be more than 30°
(45° in Canada) from the vertical plane in
any installation*.
D. The maximum length of the angled run
of the total chimney system is 20 feet. (G
plus H cannot exceed 20 feet.)
WMC42
e. A chimney support (Model SKCS8,
90'
TCS8A - 8 inch triple wall) is required
every 6 feet of angled run of chimney.
12' 6"
Chimney supports are required for every
15' 0"
30 feet and 60 feet (SK8 pipe) or 20 feet
21' 0"
and 40 feet (3-wall pipe) of vertical chim-
ney height above the hearth.
Determine the offset distance of your
chimney arrangement from the centerline
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.
WMC Series Woodburning Fireplace
30˚
RETURN
ELBOW
G
30˚
OFFSET
ELBOW
SKCS8
30˚
SUPPORT
RETURN
ELBOW
H
30˚
OFFSET
ELBOW
Example 3
FPC269
FPC269
Chimney Requirements -typ. offset
Circulating models
1/28/99 djt
OFFSET
RISE
IWF282
30° elbow Offsets
IWF282
MBUF
5/26/96
1' 1¹⁄₂' 3' 4'
Offset
0
0 0
0
0
3"
1
0 0
0
0
8Z\v"
0
1 0
0
0
11Z\v"
2
0 0
0
0
13Z\x"
1
1 0
0
0
16Z\x"
0
0 1
0
0
20Z\v"
2
1 0
0
0
21C\v"
0
0 0
1
0
26Z\v"
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\v"
0
0 0
2
1
51"
0
1 1
1
1
53Z\v"
0
0 3
0
1
56Z\v" 103Z\v"
0
1 0
2
1
59Z\v" 108Z\x"
0
0 2
1
1
62Z\v" 113Z\x"
0
1 3
0
1
64Z\x" 117Z\x"
0
0 1
2
1
68Z\v"
0
1 2
1
1
70Z\x"
0
0 0
3
1
74Z\v" 134Z\x"
0
1 1
2
2
78" 140C\v"
0
0 3
1
2
81"
0
1 0
3
2
84" 151Z\v"
0
0 2
2
2
87" 156Z\x"
0
1 3
1
2
89Z\v" 160Z\v"
0
0 1
3
2
93" 166C\v"
0
1 2
2
2
95Z\v" 170C\v"
0
0 0
4
2
99Z\v" 177C\v"
0
1 1
3
2 101Z\v" 181C\v"
0
0 3
2
2 104Z\v" 186Z\v"
0
1 0
4
2 107Z\v" 191Z\x"
0
0 2
3
2 110Z\v" 196C\v"
0
1 3
2
3
114" 203Z\v"
0
0 1
4
3 117C\v" 209C\v"
0
1 2
3
3
120" 213Z\x"
0
0 0
5
3 123C\v"
Rise
11"
20"
25Z\v"
29Z\v"
34Z\v"
40C\v"
43Z\x"
51Z\v"
55Z\v"
60Z\v"
65Z\x"
70C\v"
77C\v"
83C\v"
87Z\x"
94"
98"
124"
128"
146"
220"
5
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