TABLE
3
OFFSET
CHART
CHIMNEY
SECTIONS
REQUIRED
Offset
Desired
(In.)
2-30°
Elbows
F12-8
F12-10
F18-8
F18-10
F36-8
F36-10
F48-8
F48-10
Rise
Developed
4V2
1
Dair
15
9V«
1
Dair
1
24
12»/4
1
pair
29
V*
15
1
Dair
2
33
18
1
oair
1
38
V*
21V4
1
oair
1
39
23
V* 1
oair
2
47V4
261/a
1
pair
1
54
30
1
pair
1
59
31V4
1
pair
1
63
34J/4
1
pair
68V*
37
1
pair
2
72
40
1
pair
1
771/4
43V4
1
pair
1
83»/4
451/4
1
pair
2
86V4
48V2
1
pair
2
93
52
1
pair
11
98
53»/4
1
pair
12
102
56V4
1
Dair
2
107V4
59
1
Dair
22
111
62
1
oair
12
1161/4
65V4
1
Dair
12
122
3/4
67V4
1
pair
22
125V4
701/2
1
oair
3
132
74
1
oair
12
136V2
75
V* 1
pair
13
141
78V4
1
pair
3
146V4
Next look on the Vertical Installation ChartTable 2 to determine the pieces of pipe required forthe desired height. A 23 ft. in
stallation requires5 sections of
F48-8
chimney pipe,as shown on Table 2,a fireplace and chimneycap. Ifyou were installing a
TH42 fireplace,
you
would
only
need
the
pipe required for a 22 ft. 6 inch installation
because
TH42 is 6
inches
taller
than
a
TH36 orTH28
so
you
subtract
6
inches
from
the
desired height. From
the
Vertical Installation Chart, a 22 ft. 6 in. installation re
quires
two
F12-8,
one
F18-8
and
four F48-8
chimney
sections.
EXAMPLE
B:
Let's say you are installing the fireplace in your family room. Directlyabove the place where you would like to in
stall
the
fireplace is a bedroom. Therefore you
want
to
offset
the
chimney
to avoid
the
room. Inorder
to
calculate
the
distance
required, measure from the center of
the
fireplace to the back edge of the obstruction. Add to that distance 9 in.
The
number
you
have
calculated
is
the
center-to-center
offset
desired.
SEE
EXAMPLE B FIG.
The
measurement
from
the
center
of
the
fireplace
chimney
opening
to
the
rear
of
the
house
is 12 in.
The
calculated
center-to-center
offset
would
be
21 in.
To
determine
the chimney
components
required to obtain a 21 in.
offset
refer to Table 3. FromTable 3 you can
see
the
closest
offset
TO21 is
21V*.
So the chimney sections required areone pairof 30°elbows (offsets), and one
F36-8
chimney section.The risedeveloped
over a 21% in.
offset
is 39 in. Therefore, to determine what other chimney
sections
are required to obtain
the
desired installed
height, you simply subtract 39 in. from the height desired and refer to Table 2 for the necessary chimney components.
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