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LIGHTWEIGHT BLOCK-IN - SPECIFICATIONS (Cont.)
Factory-Built Chimney (Continued)
Using Offsets (Continued)
Elbows may be used directly off the starter sections. In the chase area above the fireplace
the chimney must maintain a 3 3/4" clearance to combustibles on the back wall, 4 1/2"
minimum on the front wall and header, and 20" 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 and to the left).
3 3/4" Min.
Offsets
are used
to obtain
Min. 4 1/2"
to header.
Cut-Away
of Block-In
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
MEASURED
OFFSET
IN INCHES
"X"
Elbows Only
3 7/8
Chimney
Add to
Elbows
12" Section
5 3/8
18" Section
8 3/8
24" Section
11 3/8
36" Section
17 3/8
48" Section
23 3/8
Flue Support
1 1/2
Chimney
4 1/2"
Min.
Chimney Adapter
Fireplace
Xtrordinair
RISE
OFFSET
"R"
"X"
14 3/8
4
Add to
Add to
Elbows
Elbows
9 1/4
5 1/4
14 1/2
8 1/4
19 5/8
---
3 0
17 1/4
40 3/8
23 1/4
2 3/8
1 1/2
Header
Facing
Brick
Majestic CF8
RISE
OFFSET
RISE
"R"
"X"
"R"
1 5
3
1 1
Add to
Add to
Add to
Elbows
Elbows
Elbows
9
5 1/4
9
14 1/4
8 1/4
14 1/4
---
---
---
3 0
17 1/4
29 3/4
40 1/4
23 1/4
40 1/4
2 1/2
1 1/2
2 3/4
Page 20
X
FMI 8 HT
Marco 8D
OFFSET
RISE
OFFSET
"X"
"R"
"X"
4 3/8
16 3/8
5 1/4
Add to
Add to
Add to
Elbows
Elbows
Elbows
5 3/8
9 1/8
5 1/4
8 3/8
14 3/8
8 1/4
---
---
---
17 3/8
29 7/8
17 1/4
23 3/8
40 1/4
23 1/4
6 3/4
11 3/4
5 1/4
R
RISE
"R"
19 1/4
Add to
Elbows
9
14 1/2
---
30 1/4
40 1/2
9 1/4
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