Using Offsets/Returns - Heatilator EL36 Series Owner's Manual

B. Using Offsets/Returns
To bypass any overhead obstructions, the chimney may be
offset using an offset/return.
An offset and return may be attached together or a chimney
section(s) may be used between an offset and return.
Perform the following steps to determine the correct chim-
ney component combination for your particular installation:
WARNING
Fire Risk
• Draft will be restricted if offset/returns
greater than 30° are used.
Table 5.2
15-degree
A B
in. mm in. mm
1-5/8 41 13-3/8 340
2-7/8 73 17-3/4 451
4-1/8 102 22-3/8 568
4-1/2 114 23-5/8 600
5-3/4 146 28-1/4 718
6 152 29-3/8 746
7-1/4 184 34 864
7-3/4 197 36-1/8 918
8-3/4 222 39-3/4 1010 16-1/4
10-3/8 264 45-5/8 1159 19-1/4
10-5/8 270 46-3/4 1187 20-1/2
11-7/8 302 51-3/8 1305 22-1/4
13-1/2 243 57-1/4 1454 25-1/4
13-3/4 349 58-3/8 1483 26-1/2
15 381 63 1600 28-1/4
16-1/2 419 68-3/4 1746 31-1/4
18 457 74-5/8 1895 34-1/4
19-5/8 498 80-3/8 2042 37-1/4
20-5/8 524 84-1/8 2137 39-1/8
22-3/4 578 91-7/8 2334 43-1/4 1099 84-1/8 2137
24 610 96-1/2 2451 45-1/8 1146 87-1/4 2216
25-7/8 657 103-1/2 2629 49-1/4 1251 94-1/2 2400
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.
18
30-degree
A B
in. mm in. mm
3-5/8 92 15-1/2 394
5-1/2 140 18-5/8 473
7-1/4 184 21-3/4 552
8-1/2 216 23-3/4 603
10-1/4 260 27 686
11-1/2 292 29 737
13-1/4 337 32-1/8 816
14-1/2 368 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
Heatilator • EL36/EL42 • 4044-132 Rev P • 02/07
• Measure how far the chimney needs to be shifted to enable
it to avoid the overhead obstacle. See Figure 5.3. Use
dimension "A" to determine chimney section required to
achieve the needed shift.
• After determining the offset dimension, refer to Table 5.2
and fi nd the "A" dimension closest to but not less than the
distance of shift needed for your installation.
• The "B" dimension that coincides with the "A" dimension
represents the required vertical clearance that is needed
to complete the offset and return.
• Read across the chart and fi nd the number of chimney
sections required and the model number of those particular
chimney parts.
• Whenever the chimney penetrates a fl oor/ceiling, a ceiling
fi restop must be installed.
• The effective height of the fi replace assembly is measured
from the base of the fi replace to the top of the starter collar.
See Dimensions in Section 12.
SL306 SL312 SL318 SL324 SL336 SL348
- - - -
1 - - -
2 - - -
- 1 - -
1 1 - -
- - 1 -
- 2 - -
- - - 1
1 - - 1
- - 2 -
- - - -
1 - - -
- - - 2
- - - -
1 - - -
- 1 - -
- - 1 -
- - - 1
1 - - 1
- - - -
1 - - -
- - - -
A
- -
- -
- -
- -
- -
- -
- -
- -
Figure 5.3
- -
Return
- -
Example: Your "A" dimension
1 -
from Figure 5.3 is 14 1/2 in.
1 -
(368 mm). Using Table 5.2
- -
the dimension closest to, but
- 1
not less than 14 1/2 in. (368
mm) is 14 1/2 in. (368 mm)
- 1
using a 30° offset/return.
- 1
It is then determined from
- 1
the table that you would
- 1
need 34 1/8 in. (867 mm)
- 1
(Dimension "B") between
1 1
the offset and return. The
chimney component that
1 1
best fi ts your application is
- 2
one SL324.
B
1-1/4 in. (32 mm)
OVERLAP
Chimney Offset/