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Less than
10' (3m)
3' (914mm)
Min.
Figure 41
TEN FOOT RULE SUMMARY
The minimum chimney height above the roof
and/or to adjacent walls and buildings is speci-
fied by all major building codes.
If the horizontal distance from the peak of the
roof is less then 10' (3 m), the top of the
chimney must be at least 2' (610 mm) above
the peak of the roof.
If the horizontal distance from the chimney
edge to the peak of the roof is more than 10'
(3 m), a chimney height reference point is
established on the roof surface located hori-
zontally 10' (3 m) from the chimney edge. The
top of the chimney must be at least 2' (610
mm) above this reference point. In all cases,
the chimney cannot be less then 3' (914 mm)
above the roof at the edge of the chimney.
The 2' in 10' rule is necessary in the interest of
safety, but does not ensure smoke-free opera-
tion. Trees, buildings, adjoining roof lines,
adverse wind conditions, etc., may require a
taller chimney should the fireplace not draft
properly ( see Figure 41 ).
MULTIPLE TERMINATIONS
If more than one termination is located in the
same chase or within the same general prox-
imity, we suggest they should be separated in
distance at least 24" (610 mm) horizontally
from flue center to flue center and stacked or
staggered vertically at least 18" (410mm) apart,
from the termination of one smoke exit to the
termination of another smoke exit ( Figure 42 ).
2' (610mm) Min.
10' (3m)
18" (457mm)
24"
(610mm)
24"
(610mm)
Figure 42
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.
FTF8 CHIMNEY COMPONENT
CALCULATIONS
The minimum installed height of the CST and
CPF fireplace systems (including fireplace and
chimney components) is 15' (4.6 m). 25' (7.6m)
with two offsets. The maximum system height
is 80' (24.4 m).
To determine the number of chimney sections
and chimney components required, follow
these steps:
1. Determine total vertical height of the fire-
place installation. This dimension is measured
from the surface the fireplace sets on to the
point where smoke exits from the termination.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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 the components are:
3' (914mm)
CST/CPF Fireplace = 48" (1219 mm)
Min.
FTF8-12
FTF8-18
FTF8-36
FTF8-48
CTD Termination
CT1 Termination
CT2 Termination
18" (457mm)
CTDT Termination = 12" to 18"
S4 Stabilizer *
* Required for every 30' (9.1 m) of vertical
chimney and 10' of offset chimney.
4. Determine amount of chimney height re-
quired by subtracting total combined height
of all pre-selected components (fireplace and
chimney components from total desired
height.)
Reference Vertical Elevation Chart and deter-
mine 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
Chimneys 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, angling in any direction,
may be the first component used off the top
of the fireplace flue collar.
= 10 ¹⁄₄" (260 mm)
= 16 ¹⁄₄" (413 mm)
= 34 ¹⁄₄" (870 mm)
= 46 ¹⁄₄" (1175 mm)
= 4" (102 mm)
= 18" (457 mm)
= 15" to 23"
(381 mm – 584 mm)
(305 mm – 457 mm)
= 3" (76 mm)*
13
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