Using Offsets/Returns - Heatilator A36R 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 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
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 4 13-3/8
2-7/8 73 17-3/4
4-1/8 02 22-3/8
4-1/2 4 23-5/8
5-3/4 46 28-1/4
6 52 29-3/8
7-1/4 84 34
7-3/4 97 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
5 38 63
16-1/2 49 68-3/4
8 457 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 60 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 - - -
45  - -
568 2 - -
600 -  -
78   -
746 - - 
864 - 2 -
98 - - -
00  - -
59 - - 2
87 - - -
305  - -
454 - - -
483 - - -
600  - -
746 -  -
895 - - 
2042 - - -
237  - -
2334 - - -
245  - -
2629 - - -
Heatilator • A36R & A42R • 28376 • Rev AJ • 08/09
Example:
Your "A" dimension from Figure 8.3 is 4 /2 in. (368
mm). Using Table 8.2 the dimension closest to, but
not less than 4 /2 in. (368 mm) is 4 /2 in. (368
mm) using a 30° offset/return.
You determine from the table that you need 34 /8 in.
(867 mm) (Dimension "B") between the offset and
return.
The chimney component that best fits your applica-
tion is one SL324.
- - - 3-5/8
- - - 5-1/2
- - - 7-1/4
- - - 8-1/2
- - - 10-1/4
- - - 11-1/2
- - - 13-1/4
 - - 14-1/2
 - - 16-1/4
- - - 19-1/4
-  - 20-1/2
-  - 22-1/4
2 - - 25-1/4
- -  26-1/2
- -  28-1/4
- -  31-1/4
- -  34-1/4
 -  37-1/4
 -  39-1/8
-   43-1/4
-   45-1/8
- - 2 49-1/4
30-degree
A B
Offset Height
in. mm in. mm
92 15-1/2 394
40 18-5/8 473
84 21-3/4 552
26 23-3/4 603
260 27 686
292 29 737
337 32-1/8 86
368 34-1/8 867
43 37-3/8 949
489 42-1/2 080
52 44-5/8 33
565 47-3/4 23
64 52-7/8 343
673 55 397
78 58-1/8 476
794 63-1/4 607
870 68-1/2 740
946 73-3/4 873
994 76-7/8 953
099 84-1/8 237
46 87-1/4 226
25 94-1/2 2400