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Heat & Glo • EXCLAIM-42C • 4013-094 Rev I • 10/06
21
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:
• 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.
Table 5.2
A
B
1-1/4 in. (32 mm)
OVERLAP
Figure 5.3 Chimney Offset/Return
Example: Your “A” dimension from
Figure 5.3 is 14 1/2 in. (368 mm).
Using Table 5.2 the dimension clos-
est to, but not less than 14 1/2 in.
(368 mm) is 15 3/4 in. (400 mm) using
a 30° offset/return. It is then deter-
mined from the table that you would
need 36 5/8 in. (930 mm) (Dimension
“B”) between the offset and return.
The chimney components that best fi t
your application are two SL412s.
Fire Risk
• Draft will be restricted if offset/return
greater than 30° are used.
WARNING
AB
SL406 SL412 SL418 SL436 SL448in. mm in. mm
4 7/812417 7/8454-----
7 1/4 184 2 2 559 1 - - - -
9 3/4 248 26 1/8 664 2 - - - -
10 1/4 260 27 1/4 692 - 1 - - -
12 3/4 324 31 3/8 797 1 1 - - -
13 1/4 337 32 3/8 822 - - 1 - -
15 3/4 400 36 5/8 930 - 2 - - -
18 1/8 460 40 3/4 1035 1 2 - - -
18 3/4 476 41 3/4 1060 - 1 1 - -
21 3/4 552 47 1194 - - 2 - -
22 1/4 565 4 8 1219 - - - 1 -
24 3/4 629 52 1/8 1324 1 - - 1 -
27 3/4 705 57 3/8 1457 - 1 - 1 -
28 1/471858 3/81483----1
30 3/478162 1/215881---1
33 3/4 857 67 3/4 1721 - 1 - - 1
36 3/4 933 73 1854 - - 1 - 1
39 3/4 1010 78 1/8 1984 - - - 2 -
41 1/8 1045 82 3/8 2092 1 - - 2 -
45 3/4116288 1/22248---11
48 1/8 1222 92 3/4 2356 1 - - 1 1
51 3/4131498 7/82511----2
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.
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