Using Offsets/Returns - Heatilator Wood Burning Fireplace A36CH Owner's Manual

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
15-degree
A B
Offset Height
in. mm in.
1-5/8 41 13-3/8
2-7/8 73 17-3/4
4-1/8 102 22-3/8
4-1/2 114 23-5/8
5-3/4 146 28-1/4
6 152 29-3/8
7-1/4 184 34
7-3/4 197 36-1/8
8-3/4 222 39-3/4
10-3/8 264 45-5/8
10-5/8 270 46-3/4
11-7/8 302 51-3/8
13-1/2 243 57-1/4
13-3/4 349 58-3/8
15 381 63
16-1/2 419 68-3/4
18 457 74-5/8
19-5/8 498 80-3/8
20-5/8 524 84-1/8
22-3/4 578 91-7/8
24 610 96-1/2
25-7/8 657 103-1/2
Proper assembly of air-cooled chimney parts result in an overlap at chimney joints of 1-1/4 in. (32 mm). Effective length is built
into this chart.
26
mm SL306 SL312 SL318 SL324 SL336 SL348
340 - - -
451 1 - -
568 2 - -
600 - 1 -
718 1 1 -
746 - - 1
864 - 2 -
918 - - -
1010 1 - -
1159 - - 2
1187 - - -
1305 1 - -
1454 - - -
1483 - - -
1600 1 - -
1746 - 1 -
1895 - - 1
2042 - - -
2137 1 - -
2334 - - -
2451 1 - -
2629 - - -
Heatilator • A36C & A42C • 28396 • Rev AG • 11/08
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 fi ts your applica-
tion is one SL324.
in.
- - - 3-5/8
- - - 5-1/2
- - - 7-1/4
- - - 8-1/2
- - - 10-1/4
- - - 11-1/2
- - - 13-1/4
1 - - 14-1/2
1 - - 16-1/4
- - - 19-1/4
- 1 - 20-1/2
- 1 - 22-1/4
2 - - 25-1/4
- - 1 26-1/2
- - 1 28-1/4
- - 1 31-1/4
- - 1 34-1/4
1 - 1 37-1/4
1 - 1 39-1/8
- 1 1 43-1/4
- 1 1 45-1/8
- - 2 49-1/4
30-degree
A B
Offset Height
mm in. mm
92 15-1/2 394
140 18-5/8 473
184 21-3/4 552
216 23-3/4 603
260 27 686
292 29 737
337 32-1/8 816
368 34-1/8 867
413 37-3/8 949
489 42-1/2 1080
521 44-5/8 1133
565 47-3/4 1213
641 52-7/8 1343
673 55 1397
718 58-1/8 1476
794 63-1/4 1607
870 68-1/2 1740
946 73-3/4 1873
994 76-7/8 1953
1099 84-1/8 2137
1146 87-1/4 2216
1251 94-1/2 2400