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B. Using Offsets/Returns
•
Use an offset/return to bypass overhead obstructions.
•
An offset and return can be used as a single entity or separated by chimney section(s).
WARNING! Risk of Fire! DO NOT use offset/returns greater than 30°. Chimney draft will be restricted and could cause
overheating and fi re.
•
Measure the shift needed to avoid the overhead obstruction. Refer to dimension A in Figure 8.3.
•
Find the appropriate A dimension listed in Table 8.2.
•
The B dimension coinciding with the A dimension measurement in Table 8.2 represents the required vertical clearance
needed to complete the offset/return.
•
Read across the chart to fi nd the number of chimney sections/model numbers needed between the offset and return.
A
B
1-1/4 in. (32 mm)
OVERLAP
Figure 8.3
Chimney Offset/Return
Table 8.2
A
B
in.
mm
in.
4 7/8
124
17 7/8
7 1/4
184
22
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
1035
18 3/4
476
41 3/4
1060
21 3/4
552
47
1194
22 1/4
565
4 8
1219
24 3/4
629
52 1/8
1324
27 3/4
705
57 3/8
1457
28 1/4
718
58 3/8
1483
30 3/4
781
62 1/2
1588
33 3/4
857
67 3/4
1721
36 3/4
933
73
1854
39 3/4
1010
78 1/8
1984
41 1/8
1045
82 3/8
2092
45 3/4
1162
88 1/2
2248
48 1/8
1222
92 3/4
2356
51 3/4
1314
98 7/8
2511
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.
26
Example:
Your "A" dimension from Figure 8.3 is 14 1/2 in. (368
mm). Using Table 8.2 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.
You determined from the table that you would need
36 5/8 in. (930 mm) (Dimension "B") between the offset
and return.
The chimney component that best fi ts your application is
two SL1112s.
mm
SL1106 SL1112 SL1118 SL1136 SL1148
454
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559
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664
2
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692
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797
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822
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930
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Heat & Glo • BAY-40, PIER-40 • 34977 • Rev V • 11/08
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