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OFFSET CALCULATIONS
Step 1. Use Offset Chart to determine amount
of horizontal offset (A) and height (B) for
various chimney section assemblies.
Step 2. Use “Height of Chimney Only” column
in The Vertical Elevation Chart to determine
combinations of chimney used above return
elbow to achieve desired heights. Reference
Components Effective Height Chart in vertical
elevation chart section.
Step 3. Use Elevation Chart as job estimator
only. Add necessary firestop spacers and sta-
bilizers as required. Firestop spacers must be
used as shown in Figures 21 and 22 and
stabilizers as shown in Figure 27 .
A
1
20' Max.
Stabilizer
(6m)
B
1
10' Max.
(3m)
Figure 36
A
2
C
2
B
2
A
1
B
1
C
1
A
2
C
2
B
2
A
1
B
1
C
1
Figure 37
Joints
FTF10 Chimney
No. 8 x ¹⁄₂" SMS
Figure 38
Underside of Chimney
Figure 39
FTF10-E30*
Return Elbow
FTF10 Chimney
Section (s)
A
B
FTF10-30*
Offset Elbow
65 ¹⁄₄"
(1657mm)
* Part of Offset/Return Package, Model FTF10-ES30
Figure 40
Page 12
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