LG MAGNA-FIRE LS43ST - Manual (Page 12)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 12
Figure 33
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 (
Refer to Figure 33 ).
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 34 ).
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:
LS43ST Fireplace = 58 ¹⁄₂" (1486 mm)
FTF13-12 = 10 ¹⁄₄" (260 mm)
FTF13-18 = 16 ¹⁄₄" (413 mm)
FTF13-36 = 34 ¹⁄₄" (870 mm)
CTD Termination = 4" (102 mm)
CT1 Termination = 18" (457 mm)
CT2 Termination = 15" to 23"
(381 mm – 584 mm)
CTDT Termination = 12" to 18"
(305 mm – 457 mm)
S4 Stabilizer * = 3" (76 mm)*
* 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'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, angling in any direction,
may be the first component used off the top
of the fireplace flue collar.
18"
(457mm)
18"
(457mm)
24"
(610mm)
3' Min.
(916mm)
Less Than 10' (3m)
2' Min. (610mm) 2' Min. (610mm)
2' Min.
(610mm)
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.
FTF13 CHIMNEY COMPONENT
CALCULATIONS
The minimum installed height of the LS43ST
fireplace system (including fireplace and chim-
ney components) is 15' (4.6 m). 22' (5.6m)
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.