18
Installation
(for qualified installers only)
© Travis Industries
4050714
93508093
Offset Requirements (30° Elbows)
•
Offsets (using a pair of 30° elbows) may be used to
redirect the chimney. Typically this is done to avoid
structures, align the pipe with framing, or to gain
clearance to combustibles (see Figure 22).
•
A maximum four 30° elbows may be used.
•
Each elbow must be used in conjunction with a
return elbow (so the chimney returns to a vertical
direction)
•
If using a single offset (two 30° elbows) a maximum
of 8' of inclined chimney may be used between
elbows.
•
If using two offsets (four 30° elbows) a maximum of 4'
of inclined chimney may be used between each set
of elbows.
•
For every 6' of inclined chimney a flue support is
required
•
Elbows may be used directly off the top of the
fireplace (maintain a 5" clearance to combustibles
on the back wall, 4 1/2" minimum on the front wall
and header, and 2" minimum to the side walls)
•
The table below details the amount of offset ("X")
and rise ("R") gained from various chimney lengths
when used with 30° elbows (see Figure 21). Make
sure to add the amounts for both elbows. Two
sections may be added together to form a combined
length. For example, 12" and 18" Temco chimney
sections give an offset of 17-5/8" (3-7/8" + 5-3/8" + 8-
3/8" = 17-5/8"). The rise ("R") equals 38-1/8" (14-
3/8" + 9-1/4" + 14-1/2" = 38-1/8").
X
R
Figure 21
Max. of 30
degrees
4' Max.
Chimney must be totally
enclosed when passing
through living space with a
minimum 2" clearance to
combustibles.
Firestop
Firestop
2"
Min.
Cooling Vents
Figure 22
Temco 82 Series
Firecraft FTF8
FMI 8DM
Marco 8D
MEASURED
OFFSET
RISE
OFFSET
RISE
OFFSET
RISE
OFFSET
RISE
IN INCHES
"X"
"R"
"X"
"R"
"X"
"R"
"X"
"R"
2 Elbows
3 7/8
14 3/8
4
15
4 3/8
16 3/8
5 1/4
19 1/4
12" Section
5 3/8
9 1/4
5 1/4
9
5 3/8
9 1/8
5 1/4
9
18" Section
8 3/8
14 1/2
8 1/4
14 1/4
8 3/8
14 3/8
8 1/4
14 1/2
24" Section
11 3/8
19 5/8
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36" Section
17 3/8
30
17 1/4
30
17 3/8
29 7/8
17 1/4
30 1/4
48" Section
23 3/8
40 3/8
23 1/4
40 1/4
23 3/8
40 1/4
23 1/4
40 1/2
Flue Support
1 1/2
2 3/8
1 1/2
2 1/2
6 3/4
11 3/4
5 1/4
9 1/4
