NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
12
Figure 38
Figure 40
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.
Figure 36
Stabilizer
A
1
20' Max.
(6m)
B
1
10' Max.
(3m)
Figure 37
A
1
C
1
B
1
B
2
C
2
A
2
A
1
C
1
B
1
B
2
C
2
A
2
Figure 39
FTF10 Chimney
Joints
No. 8 x
¹⁄₂
" SMS
Screws Required at
Ever
y Joint Past 6'
No Screws Required in
Joints for First 6' of Offset
4' (1.2m
)
6' (1.8m
)
Underside of Chimney
FTF10-E30*
Return Elbow
FTF10 Chimney
Section (s)
FTF10-30*
Offset Elbow
A
B
65
¹⁄₄
"
(1657mm)
* Part of Offset/Return Package, Model FTF10-ES30
