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C. Using Offsets/Returns
To bypass any overhead obstructions, the chimney may be
offset using an offset/return.
An offset and return may be attached together or a chimney
section(s) may be used between an offset and return.
Perform the following steps to determine the correct chim-
ney component combination for your particular installation:
WARNING
Fire Risk
•
Draft will be restricted if offsets/returns
greater than 30° are used.
Table 5.2
A
B
in.
mm
in.
4 7/8
124
17 7/8
7 1/4
184
2 2
9 3/4
248
26 1/8
10 1/4
260
27 1/4
12 3/4
324
31 3/8
13 1/4
337
32 3/8
15 3/4
400
36 5/8
18 1/8
460
40 3/4
18 3/4
476
41 3/4
21 3/4
552
47
22 1/4
565
48
24 3/4
629
52 1/8
27 3/4
705
57 3/8
28 1/4
718
58 3/8
30 3/4
781
62 1/2
33 3/4
857
67 3/4
36 3/4
933
73
39 3/4
1010
78 1/8
41 1/8
1045
82 3/8
45 3/4
1162
88 1/2
48 1/8
1222
92 3/4
51 3/4
1314
98 7/8
Proper assembly of air cooled chimney parts results in an overlap of chimney joints
of 1-1/4 in. (32 mm). Effective length is built into this table.
16
Outdoor Lifestyles by Hearth & Home Technologies Inc. • 4070-300 Rev C • 4/11
SL1106
SL1112
SL1118
mm
SL406
SL412
SL418
454
-
-
559
1
-
664
2
-
692
-
1
797
1
1
822
-
-
930
-
2
1035
1
2
1060
-
1
1194
-
-
1219
-
-
1324
1
-
1457
-
1
1483
-
-
1588
1
-
1721
-
1
1854
-
-
1984
-
-
2092
1
-
2248
-
-
2356
1
-
2511
-
-
•
Measure how far the chimney needs to be shifted to enable
it to avoid the overhead obstacle. See Figure 5.1. Use
dimension "A" to determine chimney section required to
achieve the needed shift.
•
After determining the offset dimension, refer to Table 5.2
and find the "A" dimension closest to but not less than the
distance of shift needed for your installation.
•
The "B" dimension that coincides with the "A" dimension
represents the required vertical clearance that is needed
to complete the offset and return.
•
Read across the chart and find the number of chimney
sections required and the model number of those particular
chimney parts.
•
Whenever the chimney penetrates a floor/ceiling, a ceiling
firestop must be installed.
•
The effective height of the fireplace assembly is measured
from the base of the fireplace to the top of the starter collar.
See Dimensions in Section 12.
SL1136
SL1148
SL436
SL448
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
-
-
-
-
-
-
-
-
1
-
-
2
-
-
-
1
-
-
1
-
-
1
-
-
-
1
-
-
1
-
-
1
1
-
1
-
2
-
-
2
-
-
1
1
-
1
1
Figure 5.2
-
-
2
Example: Your "A" dimension from Figure 5.2 is
14 1/2 in. (368 mm). Using Table 5.2 the dimension
closest to, but not less than 14 1/2 in. (368 mm) is
15 3/4 in. (400 mm) using a 30° offset/return. It is
then determined from the table that you would need
36 5/8 in. (930 mm) (Dimension "B") between the
offset and return. The chimney components that
best fit your application are two SL1112s or SL412s.
A
B
1-1/4 in. (32 mm)
OVERLAP
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