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5
WMC Series Woodburning Fireplace
20000583
D
RISE
B
G
H
B
OFFSET
C
E
6 FT.
G
H
A
HEARTH
FLOOR
CHIMNEY
SECTION
CHIMNEY FLUE EXIT
ELBOW
FPC269
Chimney Requirements -typ. offset
Circulating models
1/28/99 djt
30˚
OFFSET
ELBOW
30˚
OFFSET
ELBOW
30˚
RETURN
ELBOW
30˚
RETURN
ELBOW
SKCS8
SUPPORT
Example 1 Example 2 Example 3
Chimney Requirements - Offset Installations
30˚ Elbow Offsets
1'
1¹⁄₂'
3' 4'
Offset
Rise
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 WMC42
Maximum: 90' 90'
Minimum:
Without Elbows 12' 6" 12' 6"
With 2 Elbows* 15' 0" 15' 0"
With 4 Elbows* 21' 0" 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.
FPC269
IWF282
MBUF
5/26/96
OFFSET
RISE
IWF282
* In Canada, two (2) SK845 are allowed.
Fig. 4 Chimney system requirements.
Chimney
Support
0 0 0 0 0 3" 11"
1 0 0 0 0 8
¹⁄₄" 20"
0 1 0 0 0 11
¹⁄₄" 25¹⁄₄"
2 0 0 0 0 13
¹⁄₂" 29¹⁄₄"
1 1 0 0 0 16
¹⁄₂" 34¹⁄₄"
0 0 1 0 0 20
¹⁄₄" 40³⁄₄"
2 1 0 0 0 21
³⁄₄" 43¹⁄₂"
0 0 0 1 0 26
¹⁄₄" 51¹⁄₄"
0 1 1 0 0 28
¹⁄₂" 55¹⁄₄"
1 0 0 1 0 31
¹⁄₂" 60¹⁄₄”
0 1 0 1 0 34
¹⁄₂" 65¹⁄₂"
0 0 2 0 0 37
¹⁄₂" 70³⁄₄"
1 1 0 1 1 41
¹⁄₂" 77³⁄₄"
0 0 1 1 1 45" 83
³⁄₄"
0 1 2 0 1 47
¹⁄₄" 87¹⁄₂"
0 0 0 2 1 51" 94"
0 1 1 1 1 53
¹⁄₄" 98"
0 0 3 0 1 56
¹⁄₄" 103¹⁄₄"
0 1 0 2 1 59
¹⁄₄" 108¹⁄₂"
0 0 2 1 1 62
¹⁄₄" 113¹⁄₂"
0 1 3 0 1 64
¹⁄₂" 117¹⁄₂"
0 0 1 2 1 68
¹⁄₄" 124"
0 1 2 1 1 70
¹⁄₂" 128"
0 0 0 3 1 74
¹⁄₄" 134¹⁄₂"
0 1 1 2 2 78" 140
³⁄₄"
0 0 3 1 2 81" 146"
0 1 0 3 2 84" 151
¹⁄₄"
0 0 2 2 2 87" 156
¹⁄₂"
0 1 3 1 2 89
¹⁄₄" 160¹⁄₄"
0 0 1 3 2 93" 166
³⁄₄"
0 1 2 2 2 95
¹⁄₄" 170³⁄₄"
0 0 0 4 2 99
¹⁄₄" 177³⁄₄"
0 1 1 3 2 101
¹⁄₄" 181³⁄₄"
0 0 3 2 2 104
¹⁄₄" 186¹⁄₄"
0 1 0 4 2 107
¹⁄₄" 191¹⁄₂"
0 0 2 3 2 110
¹⁄₄" 196³⁄₄"
0 1 3 2 3 114" 203
¹⁄₄"
0 0 1 4 3 117
³⁄₄" 209³⁄₄"
0 1 2 3 3 120" 213
¹⁄₂"
0 0 0 5 3 123
³⁄₄" 220"
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.)
E. A chimney support (Model SKCS8,
TCS8A - 8 inch triple wall) is required
every 6 feet of angled run of chimney.
Chimney supports are required for every
30 feet and 60 feet (SK8 pipe) or 20 feet
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.
Notes: G + H cannot exceed 20 feet.
Air Space Clearances: SK8 (2-wall) = 1¹⁄₂" and "S" Series (3-wall) = 2"