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NA SERIES INSTALLATION INSTRUCTIONS
1. Using Offsets and Returns
To bypass any overhead obstructions, the chimney may be offset using a 15°
or 30° offset/return. Perform the following steps to determine the correct
chimney component combination for your particular installation.
An offset and return may be attached together or a chimney section(s) may be
used between an offset and return.
Measure how far the chimney needs to be shifted to enable it to avoid the
overhead obstacle. See Figure 7, dimension “A” to determine chimney
sections required to achieve the needed shift.
After determining the offset dimension, refer to Table 1 and find the “A”
dimension closest to
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 find the number of chimney sections required
and the model number of those particular chimney parts.
Whenever the chimney penetrates a floor/ceiling, a firestop spacer must
be installed.
The effective height of the fireplace assembly is measured from the base
of fireplace to top of starter collar. See Figure 6.
Table 1
1
° 5
3
° 0
A
B
A
1
/
"
1
3
/
"
3
/
"
5
3
7
8
8
8
2
/
"
1
7
/
"
6
/
"
7
3
1
8
4
4
-
-
8
/
"
5
8
4
/
"
2
3
/
"
9
/
"
1
5
1
2
8
4
-
-
1
1
/
"
5
8
" 6
2
9
/
"
1
2
/
"
3
1
8
4
7
/
"
3
" 4
1
4
/
"
1
5
4
8
-
-
1
5
1
/
"
4
-
-
1
7
/
"
5
8
-
-
2
0
/
"
5
8
1
0
/
"
4
6
/
"
2
1
/
"
5
3
1
8
4
4
1
1
/
"
5
1
/
"
2
3
/
"
7
3
5
8
8
8
-
-
2
6
/
"
5
8
1
3
/
"
5
8
/
"
2
7
/
"
3
3
1
4
8
4
1
" 5
6
" 3
2
9
/
"
5
8
1
6
/
"
6
8
/
"
3
2
/
"
1
3
5
2
4
8
1
" 8
7
4
/
"
3
5
/
"
5
5
8
8
-
-
3
8
/
"
5
8
-
-
4
" 1
2
2
/
"
9
1
/
"
4
4
/
"
3
7
5
4
8
8
2
" 4
9
6
/
"
4
" 7
1
2
2
5
/
"
1
0
3
/
"
5
0
/
"
7
1
5
8
2
8
* Proper assembly of air cooled chimney parts result in an overlap at chimney joints of
1¼”. Effective length is built into this chart.
07/03
the distance of shift needed for
Offset Chart*
S
L
3
1
/ 2
B
S
L
3
0
6
N
A
S
L
3
1
2
1
4
/
"
-
-
1
2
1
8
/
"
1
-
5
8
2
2
¾
"
2
-
2
3
/
"
-
1
3
4
2
7
/
"
1
1
7
8
2
" 9
-
-
3
" 3
-
2
3
4
1
/
"
-
-
8
3
8
/
"
1
-
1
4
4
3
/
"
-
-
1
2
4
4
/
"
-
-
5
8
4
8
/
"
1
-
3
8
5
3
/
"
-
-
7
8
5
5
/
"
-
-
3
4
5
" 9
1
-
6
4
/
"
-
1
1
4
6
9
/
"
-
-
1
2
7
4
/
"
-
-
5
8
7
8
/
"
1
-
3
4
8
" 5
-
-
8
9
/
"
1
-
1
8
9
5
/
"
-
-
1
2
S
L
3
3
/ 6
S
L
3
1
8
S
L
3
2
4
N
A
S
L
3
3
6
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1
-
-
-
-
-
-
1
-
-
1
-
2
-
-
-
-
1
-
-
1
-
2
-
-
-
-
-
-
-
-
-
-
1
-
-
-
1
-
-
1
-
-
-
1
-
-
1
-
-
-
17789 Rev H
WARNING!
S
L
3
4
/ 8
N
A
S
L
3
4
8
-
-
-
Your “A”
-
dimension
Figure 7 is 14½”.
-
Using Table 1 the
-
dimension closest to,
-
but not less than 14½”
-
is 14
/
” using a 30°
5
8
-
offset/return. It is then
-
determined from the
-
table that you would
need 33” (Dimension
-
“B”) between the
-
offset and return. The
1
chimney components
1
that best fit your
1
application are two
1
SL312s.
1
1
1
1
2
from
13
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