![](/images/new-backgrounds/1026211/2621151x1.webp)
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 fire.
•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 find the number of chimney sections/model numbers needed between the offset and return.
A
B
OVERLAP
Figure 8.3 Chimney Offset/Return
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 14 1/2 in. (368 mm) using a 30° offset/return.
You determine from the table that you need 34 1/8 in. (867 mm) (Dimension “B”) between the offset and return.
The chimney component that best fits your applica- tion is one SL324.
Table 8.2
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| A |
| B |
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| A |
| B | ||||
Offset | Height |
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| Offset | Height | ||||||||
in. |
| mm | in. |
| mm | SL306 | SL312 | SL318 | SL324 | SL336 | SL348 | in. |
| mm | in. |
| mm |
| 41 |
| 340 | - | - | - | - | - | - |
| 92 |
| 394 | ||||
| 73 |
| 451 | 1 | - | - | - | - | - |
| 140 |
| 473 | ||||
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| 102 |
| 568 | 2 | - | - | - | - | - |
| 184 |
| 552 | ||||
| 114 |
| 600 | - | 1 | - | - | - | - |
| 216 |
| 603 | ||||
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| 146 |
| 718 | 1 | 1 | - | - | - | - |
| 260 | 27 |
| 686 | |||
6 |
| 152 |
| 746 | - | - | 1 | - | - | - |
| 292 | 29 |
| 737 | ||
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| 184 | 34 |
| 864 | - | 2 | - | - | - | - |
| 337 |
| 816 | |||
| 197 |
| 918 | - | - | - | 1 | - | - |
| 368 |
| 867 | ||||
| 222 |
| 1010 | 1 | - | - | 1 | - | - |
| 413 |
| 949 | ||||
| 264 |
| 1159 | - | - | 2 | - | - | - |
| 489 |
| 1080 | ||||
| 270 |
| 1187 | - | - | - | - | 1 | - |
| 521 |
| 1133 | ||||
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| 302 |
| 1305 | 1 | - | - | - | 1 | - |
| 565 |
| 1213 | ||||
| 243 |
| 1454 | - | - | - | 2 | - | - |
| 641 |
| 1343 | ||||
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| 349 |
| 1483 | - | - | - | - | - | 1 |
| 673 | 55 |
| 1397 | |||
15 |
| 381 | 63 |
| 1600 | 1 | - | - | - | - | 1 |
| 718 |
| 1476 | ||
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| 419 |
| 1746 | - | 1 | - | - | - | 1 |
| 794 |
| 1607 | ||||
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18 |
| 457 |
| 1895 | - | - | 1 | - | - | 1 |
| 870 |
| 1740 | |||
| 498 |
| 2042 | - | - | - | 1 | - | 1 |
| 946 |
| 1873 | ||||
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| 524 |
| 2137 | 1 | - | - | 1 | - | 1 |
| 994 |
| 1953 | ||||
| 578 |
| 2334 | - | - | - | - | 1 | 1 |
| 1099 |
| 2137 | ||||
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24 |
| 610 |
| 2451 | 1 | - | - | - | 1 | 1 |
| 1146 |
| 2216 | |||
| 657 |
| 2629 | - | - | - | - | - | 2 |
| 1251 |
| 2400 |
Proper assembly of
26 | Heatilator • A36R & A42R • 28376 • Rev AF • 11/08 |