Offset and rise calculation
The following steps will help determine
the lengths required for an installation:
1. Determine the offset required in view
of the obstacles that must be avoided.
2. Refer to the “Offset/Rise Chart" to
determine the elbows required as well as
the insulated lengths needed.
3. Check the corresponding offset height
dimensions.
ELBOW OFFSET & RISE CHART
One length between elbows
Angle
Dia.
8"
12"
18"
24"
36"
48"
15
6" & 8"
Offset
3-5/16"
4-5/16"
5-7/8"
7-7/16"
10-1/2"
13-5/8"
Rise
15-11/16"
19-9/16"
25-3/8"
31-3/16"
43-3/4"
54-3/8"
Two lengths between elbows
8" & 48"
12" & 48"
18" & 48"
24" & 48"
36" & 48"
48" & 48"
Offset
15-3/8"
16-7/16"
18"
19-1/2"
22-5/8"
25-3/4"
Rise
60-15/16"
64-3/16"
70-9/16"
76-3/8"
87"
99-9/16"
Angle
Dia.
8"
12"
18"
24"
36"
48"
30
6" & 8"
Offset
7-7/16"
9-7/16"
12-7/16"
15-7/16"
21-7/16"
27-7/16"
Rise
20"
23-1/2"
28-11/16"
33-7/8"
44-1/4"
54-11/16"
Two lengths between elbows
8" & 48"
12" & 48"
18" & 48"
24" & 48"
36" & 48"
48" & 48"
Offset
30-13/16"
32-13/16"
35-13/16"
38-13/16"
44-13/16"
50-13/16"
Rise
60-9/16"
64"
69-1/4"
74-7/16"
84-13/16"
95-1/4"
Angle
Dia.
8"
12"
18"
24"
36"
48"
45
6" & 8"
Offset
10-5/16"
13-3/16"
17-3/8"
21-5/8"
30-1/8"
38-5/8"
Rise
17-13/16"
20-5/8"
24-7/8"
29-1/8"
37-5/8"
46-1/8"
Two lengths between elbows
8" & 48"
12" & 48"
18" & 48"
24 "& 48"
36" & 48"
48" & 48"
Offset
43-7/16"
46-1/4"
50-1/2"
54-3/4"
63-1/4"
71-11/16"
Rise
50-15/16"
53-3/4"
58"
62-1/4"
70-3/4"
79-3/16"
Fireplace through exterior
insulated chase
OFFSET
RISE
8
7
6
5
4
3
2
1
INSTALLATION KEY
1
Insulated Elbow
2
Insulated Wall Radiation Shield
3
Insulated Length
4
Universal Offset Support
5
Insulated Attic Radiation Shield
6
Adj. Roof Flashing w/ Storm Collar
7
Rain Cap
8
Firestop
9
Connector
10
Base Tee for Twin Connections
11
Floor Support
12
Universal Roof Support
13
Flat Roof Flashing w/ Storm Collar
14
Black Stove Pipe
15
Finishing Support
16
Telescopic Rigid Shield
17
Radiation Shield Connector
18
Storm Collar
19
Radiation Shield Connector Firestop
7 Security Chimneys | www.securitychimneys.com