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B. 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 fire. Secure offsets with screws ( not to exceed 1/2" / 13 mm in length) Secure returns with strapping.
Straight chimney sections may be secured with screws. Keep chimney sections from separating or twisting.
•
Measure the shift needed to avoid the overhead obstruction. Refer to dimension A in Figure 4.2.
•
Find the appropriate A dimension listed in Table 4.3. The B dimension coinciding with the A dimension measurement in
Table 4.3 represents the required vertical clearance needed to complete the offset/return.
•
Read across the chart to find the number of chimney sections/model numbers needed between the offset and return.
Figure 4.2
Chimney Offset/Return
Table 4.3 Offset Dimensions
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
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
VCG Designer Series • DSR42 Installation Manual • 4012-134 • Rev A • 02/20/15
A
B
1-1/4 in. (32 mm)
OVERLAP
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
-
-
Example:
Your "A" dimension from Figure 4.2 is 14 1/2 in.
(368 mm). Using Table 4.3 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 fits your application is
two SL1112s.
Note: SL400 series pipe available
SL1136
SL1148
for Canada ONLY.
SL436
SL448
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
-
-
-
-
-
-
-
-
1
-
-
2
-
-
-
1
-
-
1
-
-
1
-
-
-
1
-
-
1
-
-
1
1
-
1
-
2
-
-
2
-
-
1
1
-
1
1
-
-
2
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