20
3-9/16"
5-7/8"
8-7/8"
11-15/16"
14-15/16"
17-5/16"
20-7/8"
23-5/16"
26-5/16"
29-5/16"
32-5/16"
37-13/16"
AABBAB
14-3/16"
18-5/16"
23-9/16"
28"
34-1/16"
38-5/16"
44-9/16"
48-15/16"
54-1/8"
59-5/16"
64-3/8"
73-13/16"
3-3/4"
6-1/4"
9-1/4"
12-5/16"
15-5/16"
17-5/8"
21-1/4"
23-11/16"
26-11/16"
29-11/16"
32-9/16"
38-1/8"
15-1/2"
19-1/2"
24-3/4"
29-13/16"
35-3/8"
39-3/16"
45-5/8"
49-3/4"
54-15/16"
60-1/8"
64-5/8"
74-1/16"
3-7/8"
6-3/8"
9-3/8"
12-7/8"
15-7/16"
17-9/16"
21-7/16"
23-7/8"
26-7/8"
29-9/16"
32-5/8"
38"
15-3/8"
19-3/4"
25"
30-1/16"
35-1/4"
39-5/8"
46-1/16"
50-3/16"
55-9/16"
60-3/4"
65-1/4"
74-5/16"
1-1/4"
2-1/16"
4-1/16"
5-5/8"
7-1/4"
8-7/16"
10-1/4"
11-1/2"
13-1/8"
14-11/16"
16-1/4"
19"
A
A
B
BAB
10-5/8"
15-3/8"
21-1/4"
27-3/16"
33"
37-5/8"
44-1/2"
49-1/4"
55"
60-3/4"
66-3/4"
77-5/16"
1-5/16"
2-1/4"
4-1/8"
5-11/16"
7-1/4"
8-7/16"
10-1/4"
11-9/16"
13-1/8"
14-5/8"
16-3/16"
19"
11"
15-3/4"
21-1/2"
27-3/8"
33-1/8"
37-7/8"
44-3/4"
49-3/8"
55-1/4"
61-1/4"
66-7/8"
77-9/16"
1-5/8"
2-1/2"
4-1/8"
5-11/16"
7-1/4"
8-1/2"
10-3/8"
11-11/16"
13-1/4"
14-3/4"
15-5/16"
19"
11-3/8"
15-3/4"
21-13/16"
27-5/8"
33-3/8"
38-3/16"
45-1/16"
49-3/4"
55-5/8"
61-5/8"
67-1/8"
77-11/16"
It may be necessary to offset the chimney in order to clear a joist or an obstacle. The two (2) charts below will assist you in selecting the proper
combination of elbow angle and chimney length(s) that will provide the necessary degree of offset within an available height.
CHART 1 - OFFSET CHIMNEY INSTALLATION
1. Select the column with the proper chimney
diameter of your system.
2. Determine the distance of the offset required by
dropping a plumb line for an accurate measurement.
The offset is measured at the chimney centre line as
per the "A" Offset measurement in the diagram
below.
3. On the chart, find the predetermined distance
(under the "A" column) required for the 15
o
elbow.
For greater offset, use the 30
o
offset chart.
4. After finding the offset, look at the "B" (height)
measurement in the diagram below and under column
"B" in the chart to find the specified height. The
appropiate "chimney lengths" required in between
elbows is found in the left hand side column on the
chart..
15
o
OFFSET CHART
Lengths
7" Diameter6" Diameter 8" Diameter
none
6"
12"
18"
24"
6"+12"+ 18"
36"
6"+18"+ 24"
12" + 36"
18" + 36"
24" + 36"
12"+24"+36"
"A"
Offset
NOTE:
• Model JM/ALT chimneys are limited to offsets not exceeding 30 degrees. Combining offsets for greater angle is not permitted.
• One pair of (two) 15
o
or 30
o
elbows may be used per interior installation.
• Never install an elbow in a joist area. Chimney sections must pass vertically through framed joist areas.
• Locking bands must be use at all chimney joints of an offset.
• Elbow support will support 15 feet of chimney and the maximum length of chimney allowed between elbows is 6 feet.
30
o
OFFSET CHART
Lengths
7" Diameter6" Diameter 8" Diameter
none
6"
12"
18"
24"
6"+12+24"
36"
6" + 36"
12" + 36"
18" + 36"
24" + 36"
12"+24"+36"
"B"
Height
Chimney
Chimney
All measurements are in inches. Construction tolerances + one inch.
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