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BFC36 Balanced Flue Heat-Circulating Fireplace
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: = 2" Min. to Combustibles
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.
BFC36
Maximum:
50'0"
Minimum:
Without Elbows
14'6"
With 2 Elbows*
14'6"
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.
Fig. 3 Chimney system requirements.
6
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.)
E. A chimney support (Model TCS8A)
is required every 6 feet of angled run of
chimney. Chimney supports are required
for every 30 feet and 60 feet of vertical
chimney 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.
30°
Return
Elbow
G
30°
Offset
Elbow
TCS8A
30°
Support
Return
Elbow
H
30°
Offset
Elbow
Example 3
FP269
FP269
MBUF
5/16/96
rev. 5/25
Offset
Rise
IWF282
FP282
30 Elbow Offsets
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"
7412647
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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