20
ZERO CLEARANCE INSTALLATION - SPECIFICATIONS (Cont.)
Factory-Built Chimney (Continued)
Using Offsets (Continued)
Elbows may be used directly off the starter sections. In the chase above the fireplace the
chimney must maintain a 5" clearance to combustibles on the back wall, 4 1/2" minimum on
the front wall and header, and 18" minimum to the side wall for a vertical chimney. After the
first firestop a 2" minimum clearance on all sides must be maintained. See the illustration
below.
Fireplace
Xtrordinair
Header
Chimney
5" Min.
4 1/2"
Min.
Offsets
can be
used to
maintain
the
minimum
clearances
Facing
Cooling Vent
X
R
To determine which chimney sections are needed in conjunction with the offset elbows to get
the desired offset ("X"), add a section or any combination of sections to the elbows in the "X"
column of the chimney brand being used in the chart below. For example, using Temco
chimney an offset of 17 5/8" is achieved by adding elbows to a 12" and 18" section (3 7/8" + 5
3/8" + 8 3/8" = 17 5/8"). The rise ("R") is computed the same way by using the "R" column (14
3/8" + 9 1/4" + 14 1/2" = 38 1/8").
Temco 82 Series
Superior TF8
Majestic CF8
FMI 8DM
Marco 8D
MEASURED
OFFSET
RISE
OFFSET
RISE
OFFSET
RISE
OFFSET
RISE
OFFSET
RISE
IN INCHES
"X"
"R"
"X"
"R"
"X"
"R"
"X"
"R"
"X"
"R"
Elbows Only
3 7/8
14 3/8
4
1 5
3
1 1
4 3/8
16 3/8
5 1/4
19 1/4
Chimney
Add to
Elbows
Add to
Elbows
Add to
Elbows
Add to
Elbows
Add to
Elbows
Add to
Elbows
Add to
Elbows
Add to
Elbows
Add to
Elbows
Add to
Elbows
12" Section
5 3/8
9 1/4
5 1/4
9
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 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
3 0
17 1/4
3 0
17 1/4
29 3/4
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 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
1 1/2
2 3/4
6 3/4
11 3/4
5 1/4
9 1/4
