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B36LA8 & B36RA8 Woodburning Fireplaces
Chimney Requirements - Offset Installations
CHIMNEY FLUE EXIT
A
D
C
OFFSET
B
Example 1
Notes: G + H cannot exceed 20 feet.
Air Space Clearances:
SK8 (2-wall) = 1Z\x"
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.
B36LA8/B36RA8
Maximum:
Minimum:
Without Elbows
With 2 Elbows*
With 4 Elbows*
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) 45° elbows are allowed.
Fig. 5 Chimney system requirements.
16
CHIMNEY
SECTION
ELBOW
B
G
E
RISE
6 FT.
H
HEARTH
FLOOR
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.)
E. A chimney support (Models SKCS8)
is required every 6 feet of angled run of
90'0"
chimney. Chimney supports are required
for every 30 feet and 60 feet of vertical
15'6"
chimney height above the hearth.
17'6"
Determine the offset distance of your
21' 0"
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.
30˚
RETURN
ELBOW
G
30˚
OFFSET
ELBOW
SKCS8
30˚
SUPPORT
RETURN
ELBOW
H
30˚
OFFSET
ELBOW
Example 3
FP720
FP720
STR/CVR
6/4/98
CHIMNEY INSTALLATION
OFFSET
RISE
FP282
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"
87D0176
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"
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