20
2-7/8"
7-3/4"
8-1/4"
11-1/2"
14-3/8"
18-5/8"
20-1/4"
25-1/8"
26-1/8"
28-5/8"
32-3/8"
38-7/8"
AABBAB
13"
20-1/4"
21-1/2"
27"
31-7/8"
39-3/4"
42-1/2"
49-7/8"
50-3/4"
56-1/4"
61"
69-1/4"
3-3/4"
8-3/8"
9-3/8"
11-5/8"
15-1/4"
20-1/4"
22"
26"
26-3/4"
29-3/4"
34-3/8"
39-1/4"
14"
21-1/4"
22-3/4"
27-1/2"
33"
40-3/8"
42-1/2"
50-3/8"
52"
56-1/2"
61-5/8"
70-7/8"
3-3/4"
7-3/4"
7-5/8"
11-3/8"
14-1/2"
18"
21"
24-1/4"
24-3/4"
28-3/8"
32-1/4"
37-1/4"
14-1/4"
22-1/8"
23-1/2"
28-3/4"
34-1/4"
42-1/4"
44-1/4"
52-3/8"
53-7/8"
58-7/8"
64"
72-1/2"
1"
3-1/4"
4"
5-1/2"
7-1/8"
9-5/8"
10-3/8"
12-1/2"
13-1/4"
15-7/8"
22-1/4"
23-1/2"
A
A
B
BAB
11"
19-1/2"
20-7/8"
26-1/2"
32"
40-5/8"
43-7/8"
52-1/4"
54"
59"
64-7/8"
75-1/8"
1-1/4"
4"
4-1/4"
5-5/8"
7-1/8"
10-1/4"
10-3/4"
13"
13-1/2"
15-5/8"
17-7/8"
20-1/2"
11"
19-1/2"
21-1/8"
26-3/4"
32-5/8"
40-7/8"
43-7/8"
52-1/8"
53-5/8"
59"
65-1/8"
75-3/8"
1-3/4"
4-1/8"
4-3/8"
6"
8"
10"
11-1/8"
13-1/8"
14-1/2"
15-1/8"
17-3/8"
21-1/4"
10-3/4"
19-1/4"
20-7/8"
26-3/4"
32-3/4"
41-1/8"
44"
52-1/8"
53-3/4"
59-3/4"
65-5/8"
75-1/2"
CHART 1 - OFFSET CHIMNEY INSTALLATION
When the chimney path cannot be perfectly straight, the need to install a chimney offset must be used when it becomes 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.
1. Select the column with the proper chimney
diameter of your system.
2. Determine the distance of the offset required
by dropping a plumb bob for an accurate mea-
surement. The offset is measured at the chim-
ney centre line as per the "A" measurement in
the diagram.
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 under column "B"
to find the specified height and appropiate "chim-
ney lengths" required in the left column.
NOTE:
•Sentinel CF chimney is limited to offsets not exceeding 30 degrees. Combining offsets for greater
angle is not permitted.
•Two pairs of (four) 15
o
or 30
o
elbows may be used per interior installation.
•Locking bands must be used at each joints. For added security on multiples lengths forming
an offset, fasten the joints using two (2) #6 x 1/2" stainless steel sheet metal screws through
the pre-punched holes in the locking bands (see diagram on the left).
•Never install an elbow in a joist area. Chimney sections must pass vertically through framed
joist areas.
•Elbow support will support 30 feet of chimney and the maximum length of chimney allowed
between elbows is 6 feet.
Stainless Steel
Sheet Metal
Screws
"A"
Offset
"B"
Height
30
o
OFFSET CHART
Chimney 7" Diameter6" Diameter 8" Diameter
Lengths
none
9"
12"
18"
24"
9" + 24"
36"
9" + 36"
12" + 36"
18" + 36"
24" + 36"
12"+24"+36"
All measurements in these charts are in inches. Construction tolerances
+ one inch.
15
o
OFFSET CHART
Lengths
Chimney 7" Diameter6" Diameter
8" Diameter
none
9"
12"
18"
24"
9" + 24"
36"
9" + 36"
12" + 36"
18" + 36"
24" + 36"
12"+24"+36"
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