NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
11
A
¹⁄₈
" diameter hole must be drilled in the
chimney joint using a
¹⁄₈
" diameter drill. Hole
should be drilled in center of joint overlap (
see
Figure 38 ). Be sure to drill only through the
outer chimney casting. Do not puncture the
inner flue.
Maximum offset of chimney system is 30
°
.
Two offsets must not be assembled to form a
60
°
offset. However, two sets of offset and
return elbows may be used on a single flue
system, provided the total height of the sys-
tem exceeds 25'.
Return elbow support straps must be securely
attached under tension (in shear) to structural
framing members above. Do not substitute a
FTF13-30 offset elbow in place of a FTF13-E30
return elbow.
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 22 and 23 and
stabilizers as shown in
Figure 27.
MULTIPLE TERMINATIONS
If more than one termination is located in the
same chase or within the same general proxim-
ity, we suggest they should be separated in
distance at least 24" horizontally from flue cen-
ter to flue center and stacked or staggered
vertically at least 18" apart, from the termina-
tion of one smoke exit to the termination of
another smoke exit (
Figure 34 ).
This suggestion is provided in the interest of
better operation. If the terminations are located
too close to each other, smoke may migrate
from one flue into the other.
Figure 34
Figure 35
Stabilizer
A
1
20'
Max.
B
1
10' Max.
Offset
Elbow
Return
Elbow
18"
18"
24"
24"
FTF13 CHIMNEY COMPONENT
CALCULATIONS
The minimum installed height of the EST-48
fireplaces system is 15' 6", higher with offsets.
The maximum height for the system is 80'.
To determine the number of chimney sections
and chimney components required, follow these
steps:
1. Determine the total vertical height of the
fireplace installation. This distance is measured
from the surface the fireplace rests on to the
point where smoke exits the termination.
2. Determine the number of chimney compo-
nents required, except chimney sections. This
would include firestop spacers, stabilizers, roof
flashing, etc.
3. The effective heights of various components
are:
The Fireplace
= 52
¹⁄₂
"
FTF13-12
= 10 1/4"
FTF13-18
= 16 1/4"
FTF13-36
= 34 1/4"
FTF13-CTD termination = 4"
FTF13-CTDT termination = 12" to 18"
FTF13-CT1 termination = 12" to 18"
FTF13-CT2 termination = 15" to 23"
FTF13-S4 stabilizer*
= 3"
* Required for every 30' of vertical chimney
and/or 10' of offset chimney.
4. Determine the amount of chimney height
required by subtracting the total combined
height of all pre-selected components (fire-
place and chimney components from the total
desired height).
5. Reference the Vertical Elevation Chart and
determine the number of chimney sections
(quantity and length) required.
SPECIAL OFFSET INSTRUCTIONS
To clear any overhead obstructions, you may
offset your chimney system using Security's
30
°
offset and return elbows. Use two elbows -
an offset elbow to initiate the offset and a return
elbow to terminate it. A 30
°
offset elbow, an-
gling in any direction, may be the first compo-
nent used off the top of the fireplace flue collar.
The offset and return elbows may be attached
together, or a section or sections of chimney
may be used between, but do not exceed 20' in
total length between elbows. If sections of
pipe exceed 10' between elbows, a chimney
stabilizer must be used at the midpoint (
Figure
35 ). The stabilizer support straps must be
attached under tension (in shear) to structural
framing members above. When two sets of
elbows are used, the maximum combined
length of chimney used between elbows can-
not exceed 20' (
see Figure 36 ). Example: If C
1
= 10' then C
2
cannot exceed 10'.
If an offset exceeds 6' in length, each chimney
joint beyond the first 6' of offset to the return
elbow, must be secured by a No. 8 x
¹⁄₂
" sheet
metal screw located at the underside of the
joint (
see Figure 37 ).
