INSTALLATION
INSTRUCTIONS
MAGNA-FIRE
43" Wood Burning Fireplace
P/N 850,004M REV. F 10/2006
LENNOX HEARTH PRODUCTS
MODELS
LS43ST
This installation manual will enable you to obtain a safe, efficient and
dependable installation of your fireplace system. Please read and
understand these instructions before beginning your installation.
Do not alter or modify the fireplace or its components under any
circumstances. Any modification or alteration of the fireplace system,
including but not limited to the fireplace, chimney components and
accessories, may void the warranty, listings and approvals of this system
and could result in an unsafe and potentially dangerous installation.
IMPORTANT! TO ASSURE PROPER ALIGNMENT OF GLASS DOORS:
INSTALL THIS FIREPLACE IN A SQUARE AND PLUMB CONDITION,
USING SHIMS AS NECESSARY AT SIDES AND/OR BOTTOM.
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
OTL Report No. 116-F-19-02
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PRECAUTIONS
INTRODUCTION
General Information
CLEARANCES AND HEIGHT
REQUIREMENTS
Note: These fireplace systems are not difficult
to install. However, in the interest of safety, it is
recommendedthattheinstallerbeaqualifiedor
certified “tradesman” familiar with commonly
accepted fireplace installation and safety tech-
niques as well as prevailing local codes.
This Signature Series LS43ST is a radiant-
heat, two-sided fireplace with a variety of
glass door options. A steel grate is also in-
cluded with the LS43ST to properly position
the fire. An outside combustion air kit is
available as optional equipment.
The fireplace may be placed on or near normal
construction materials*. The combustion air
kit,firestopspacerandroofflashing(notchase
flashings) may be placed directly on or against
normal construction materials.* The chimney
and fireplace outer wrapper require a mini-
mum 2" and 1" air space to combustibles
respectively. A combustible mantle may be
installed 12" above the opening of the fireplace
as per NFPA 211, Section 7-2.3.3.
The most important areas of concern dealing
withtheinstallationoffactory-builtfireplacesare
clearances to combustible materials, proper as-
sembly of component parts, height of the chim-
ney system, the proper use of accessories sup-
plied by the manufacturer and the techniques
employed in using finishing materials applied to
the wall surrounding the fireplace, hearth exten-
sions and wall shields. Each of these topics will
be covered in thorough detail throughout this
manual. Please give each your special attention
as you progress with your installation.
Note: Illustrationsshownreflect“typical”instal-
lations with nominal dimensions and are for
designandframingreferenceonly.Actualinstal-
lations may vary due to individual design prefer-
ences.However,alwaysmaintainminimumclear-
ances to combustible materials and do not vio-
late any specific installation requirements.
The fireplace opening of the LS43ST must be
kept a minimum of 12" (305 mm) from a side
wall. A perpendicular side wall can not be
closer that 12" (305 mm) to the LS43ST
fireplace.
These fireplaces have been tested and listed
by Omni-Test Laboratories (Report No. 116-
F-19-02) to U.L. standard 127. These units
are intended for installation in residential
homes and other buildings of conventional
construction including commercial, not in
mobile homes.
As with all chimney installations, avoid over-
head obstructions such as trees, power lines,
etc. Additionally chimney terminations must
meet certain clearance to roof requirements
detailed in the paragraph titled Ten-Foot Rule
Summary.
TYPICAL INSTALLATION
These fireplace systems are designed for in-
stallation in accordance with the National Fire
Protection Standard for chimneys, fireplaces
and solid fuel burning appliances; NFPA 211
andinaccordancewithcodessuchastheBOCA
Basic/National Codes, the Standard Mechani-
cal Code and the Uniform Building Codes.
The fireplace and chimney system must be
enclosed when installed in or passing through
a living area where combustibles or people
may come in contact with it. This is important
to prevent possible personal injury or fire
hazard.
The local authority having jurisdiction should
be consulted before installation, to determine if
any permits need to be obtained.
For questions, please call your distributor or
the manufacturer. Special restrictions apply to
the front and facing of the fireplace and nearby
walls (See pages 18, 19 and 20 ).
Chimney and
Termination
WARNING: FAILURE TO USE MANUFAC-
TUREPROVIDEDPARTS,VARIATIONSIN
TECHNIQUES AND CONSTRUCTION MA-
TERIALS OR PRACTICES OTHER THAN
THOSE DESCRIBED IN THIS MANUAL
MAY CREATE A FIRE HAZARD AND VOID
THE LIMITED WARRANTY.
*Construction Materials:
• framing materials • paneling
• particle board
• dry wall
• flooring
• etc.
• plywood
The LS43ST system consists of three “sub-
systems”:
1. The Fireplace and Door Assemblies
2. The Chimney and Termination
3. The Optional Combustion Air Kit
Model LS43ST
Figure 1
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CHIMNEY SYSTEM
WARNING: DO NOT PACK OR FILL RE-
QUIRED AIR SPACES WITH INSULATION
OR OTHER MATERIAL. NO MATERIAL IS
ALLOWED IN THESE AREAS.
These fireplaces are designed and code listed
for use with Security Chimneys FTF13 chimney
System only. Always use Security Chimneys
FTF13 chimney components with these fire-
places. Do not modify or alter these compo-
nents as this may cause a potential serious
hazard and void the Warranty.
Damper
Closed
Damper
Open
Note: Do not insulate the chase cavity with
blown or fill type insulation materials.
Lintel
Chimney Height
Insulate Joists
Same As Ceiling
The total height of your LS43ST fireplace
system from the surface the fireplace rests
on to the chimney top must not exceed 80'
(24.4m) and must also meet minimum sys-
tem height chart.
Figure 3
LOCATION OF FIREPLACE
Draft Stops
Firestop
Carefully select the proper location for heat
circulation, aesthetics, chimney obstructions
and clearance to side wall(s). With proper pre-
planning, a slight adjustment of a few inches
can save considerable time and expense later
during construction and assembly.
Minimum System Height
Model LS43ST
Security's
FTF13
Vertical Installation
One Offset
14' 0" (3.7 m)
15 ¹⁄₂ 0" (3.9 m)
22' 0" (5.6 m)
FTF13
CTDT
Termination
Two Offsets
Note: Non-
Combustible
Chase
Flashing
Must Be
Used To
Cover
Chase Enclosure
Chase
A chase is a vertical box-like structure con-
structed to surround the fireplace and chim-
ney. Refer to Figure 2 for a typical chase
configuration. A chase should be constructed
and insulated just like any outside wall. Chase
insulation in a cold climate installation is not
required for safety.
Opening
Optional
Insulation
In Outside
Walls Of
Chase
8'
ASSEMBLY OUTLINE
Before You Start
Level
Figure 4
Solid
Continuous
Surface
Carefully consider the position of the fireplace
opening with respect to the location of adja-
cent or nearby stairwells, bath or kitchen ex-
haustfansand/orreturnairregistersforforced
air furnaces/air conditioners that could cause
a smoking fireplace condition if the house is
tightly insulated.
Check your inventory list to be sure you have all
the necessary parts supplied in good usable
condition.Checkalsoforanyconcealeddamage.
Outside
Base
Insulation
(Thermal Barrier)
Checktheoperationofthedamper.Thedamper
is controlled through the use of a control lever
located within the firebox opening at the top
center just behind the firebox lintel (Figure 3 ).
The control lever snaps into place at the ex-
treme range of motion, up and back in the
closed position. When pulled forward and
down, the damper is open.
Figure 2
This system is intended to be installed in resi-
dential homes and buildings of conventional
construction, not in mobile homes.
WARNING: IF INSULATION IS USED, THE
FIREPLACE MUST NOT BE PLACED DI-
RECTLY AGAINST IT. INSULATION OR
VAPORBARRIERS,IFUSED,MUSTFIRST
BE COVERED WITH GYPSUM BOARD,
PLYWOOD,PARTICLEBOARDOROTHER
MATERIALTOASSUREINSULATIONAND
VAPOR BARRIERS REMAIN IN PLACE.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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Whenlocatingthefireplace,considerationmust
be given to combustibles and final finishing.
For an example of this, see Figure 5 and
confine the final location of combustible finish
materials to the "Safe Zone".
PRE-INSTALLATION NOTES
INSTALLING THE FIREPLACE
The fireplace may be installed directly on a
combustible floor or raised on a platform of an
appropriate height. Do not place fireplace on
carpeting, vinyl or other soft floor coverings. It
may, however, be placed on flat wood, ply-
wood, particle board or other hard surfaces.
Be sure fireplace rests on a solid continuous
floor or platform with appropriate framing for
support and so that no cold air can enter the
room from under the fireplace.
Step 1. Slide the fireplace into prepared fram-
ing or position fireplace in its final position and
frame later.
DO NOT permanently place furniture or other
items such as decorative pillows within 60" of
the fireplace front face.
The fireplace may not be recessed into a com-
bustiblefloor.Maintainthefloortohearthclear-
ance established by the fireplace lower front
face.
Black Portion Of Frame
Not To Be Covered With
Combustible Materials
Step 2. Insert the provided metal safety strips,
beneath the fireplace as illustrated (Figures 6, 7
and 8 ). The safety strips should overlap ¹⁄₂" for
continual coverage of the floor.
The fireplace may be positioned and then the
framing built around it, or the framing may be
constructed and the fireplace positioned into
the opening.
Wall
Covering
7”
30°
Note: Safety strips are not required when fire-
place rests on a noncombustible surface.
4”
Usually, no special floor support is needed for
the fireplace, however, to be certain:
Door
Opening
Safe
Zone
12”
Min.
1. Estimate the total weight of the fireplace
system including chimney and surround ma-
terials such as brick, stone, etc., to be in-
stalled. Shippingweightsforthefireplacemay
be found on page 20.
Figure 5
Hearth
Hearth
ASSEMBLY STEPS
Metal Safety
Strips
Extension
Extension
2. Measure the square footage of the floor
space to be occupied by the system, surrounds
and hearth extensions.
Note: The following steps represent the normal
sequence of installation. Each installation is
unique, however, and might require a different
sequence.
Floor
Floor
Figure 6
3.Notethefloorconstruction,i.e.2x6’s,2x8’s
or 2 x 10’s, single or double joists, type and
thickness of floor boards.
1. Position firebox prior to framing or into
prepared framing.
4. Use this information and consult your local
building code to determine if you need addi-
tional support.
2. Install the chimney system.
3. Install optional outside combustion air kit.
Hearth
If you plan to raise the fireplace and hearth
extension, build the platform assembly then
position fireplace and hearth extension on top.
Secure the platform to the floor to prevent
possible shifting.
Hearth
Metal Safety
Strips
Extension
Extension
4. Plumb gas line if a decorative gas appliance
will be used. (Gas connections should only be
performed by an experienced, licensed/certi-
fied tradesman).
Platform
Floor
6. Install both door assemblies.
CLEARANCES
Figure 7
7. Complete finish wall material, surround and
hearth extension to your individual taste.
Minimum clearance to combustibles for the
appliance is as follows: sides - 1" (25 mm),
floor-0"(0mm), adjacentwall-12"(305mm),
ceiling - 37 ¹⁄₂" (953 mm).
Note: Install the hearth extension only as illus-
trated.
Study the three dimensional illustration (Fig-
ure 1 ) to get a general idea of each element of
your fireplace system.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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IMPORTANT: UNDER NO CIRCUMSTANCES
CAN THE FIREPLACE TOP SPACERS (FIGURE
10 ) BE REMOVED OR MODIFIED, NOR MAY
YOU NOTCH THE HEADER TO FIT AROUND
OR BE INSTALLED LOWER THAN THE SPAC-
ERS. THE HEADER MAY BE IN DIRECT CON-
TACTWITHTHETOPSPACERSBUTMAYNOT
BE SUPPORTED BY THEM.
FRAMING WALL VARIATIONS
As many as six (6) different framed wall con-
figurations can be constructed to enclose the
LS43ST fireplace. The following illustrations
depict these variations of wall enclosures. Sev-
eral of these designs may incorporate book
shelves, wood storage boxes, etc.
Platform
Metal
Safety Strips
LS43ST - Wall Types
4 x 6 Header
2" Min.
(51 mm)
Figure 8
2 x 4 False
Header
“C” Type Wall
Spacer
*
“T” Type Wall
“L” Type Wall
Metal
Safety Strips
*
2" Min.
Figure 10
*
(51 mm)
No Combustible
Materials in
Figure 9
Shaded Areas
The safety strips should extend in front and
sides of the fireplace opening 2" (51 mm) . In
the event a wooden support is used to elevate
the fireplace above the floor, a “Z” type safety
strip should be fabricated and used to protect
the front surface of the wood support as well
as the floor beneath the hearth extension (see
Figures 8 and 9 ). The safety strips should be
tacked down to prevent possible movement.
Note: A minimum 2”
air space clearance
to combustibles and
any portion of the
chimney is required.
Note: The “Z” type safety strip is not supplied.
“H” Type Wall
“Y” Type Wall
Figure 11
Step 3. Refer to fireplace drawings and speci-
fications on pages 7 and 8 for framing dimen-
sions and details. False header may be posi-
tioned directly on top of the fireplace spacers
(see Figures 10, 11 and 12 ).
No Combustible
Materials in
Shaded Areas
Parallel Wall
Figure 13
Figure 12
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FRAMING SPECIFICATIONS
58 ⁵⁄₈"
(1490 mm)
47 ¹⁄₈"
(1197 mm)
26 ¹⁄₄"
(667 mm)
54 ³⁄₄"
(1391 mm)
Figure 14
19 ¹⁄₄" (489 mm)
Allow 19” For
Clearance
26 ¹⁄₄" (667 mm)
For ⁵⁄₈" Drywall
26 ¹⁄₂" For
¹⁄₂" Drywall
58 ⁵⁄₈"
(1490 mm)
47 ¹⁄₈"
(1197 mm)
54 ³⁄₄" (1391 mm)
Side View
Front View
Figure 15
Figure 16
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FIREPLACE SPECIFICATIONS
27 ⁹⁄₁₆"
(701 mm)
52 ¹¹⁄₁₆" (1335 mm)
58 ¹⁄₂"
(1486 mm)
44 ¹⁄₈"
(1121 mm)
Outside Air Inlet
This Side Only
24 ⁵⁄₈"
(625 mm)
47"
(1194 mm)
Gas Line Inlet
20 ¹⁄₁₆"
(508 mm)
9 ¹⁄₂"
(241 mm)
8 ¹⁄₂"
(216 mm)
8"
(203 mm)
39 ⁵⁄₁₆" (1002 mm)
42 ³⁄₄" (1086 mm)
52 ³⁄₄" (1340 mm)
Front View
11 ³⁄₄"
(298 mm)
11 ³⁄₄"
(298 mm)
End View
52 ³⁄₄" (1340 mm)
27 ⁹⁄₁₆"
(700 mm)
Top View
Figure 17
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Step 3. Position appropriate firestop spacer at
ceiling and nail temporarily with two (2) 8d
nails. Use flat firestop spacer, Model F10FS-2,
ifchimneypenetratesceilingvertically.Ifchim-
ney penetrates ceiling at 30° angle (offset
chimney), use Model F10FS30-2. Nailed, one
each on opposite sides to hold firestop spacer
in position. Nail permanently, using at least
two (2) more 8d nails, after chimney sections
have been assembled through the firestop
spacer and after any necessary adjustments
have been made. Firestop spacer must be
secured by at least four (4) 8d nails when
completely installed.
Step 2. Using standard construction framing
techniques,constructopeningforchimneyroute
upthroughtheceiling(s)androoforthroughan
outside chase.
Step 4. Two sets of nailing tabs have been
provided. One set of four is to accommodate
⁵⁄₈" drywall and the other set is for ¹⁄₂" drywall.
To insert the unit into prepared framing, bend
the four nailing flanges adjacent to one of the
fireplace faces completely over 180 degrees
until they are flush with the cabinet. Bend the
remaining nailing flanges adjacent to the op-
posite face out 90 degrees (see Figure 18 ).
Slide the unit through the framed opening with
the face adjacent to the flanges bent fully over
180 degrees, inserted first.
Framing must maintain adequate minimum air
space clearance at all times.
CAUTION: ALLOW MINIMUM 2" (51 MM)
CHIMNEY AIR SPACE TO COMBUSTIBLE
FRAMING MEMBERS THROUGHOUT VERTI-
CAL OR OFFSET CHIMNEY INSTALLATION.
ALSO MAINTAIN AIR SPACE ON TOP OF THE
FIREPLACE AS DEFINED BY THE SPACERS
AND STANDOFFS.
Slidetheunitintothepreparedframinguntilthe
unit is centered between the walls. Fold the
nailing tabs back against the framing, level the
unit with shims as necessary and secure the
fireplace to the side frame members with 8d
nails or screws as appropriate.
Note: If there is a room above ceiling level,
firestop spacer must be installed on the bottom
side of the ceiling. If an attic is above ceiling
level, firestop spacer must be installed on top
side of ceiling joist (Figures 20 and 21).
A minimum 2" (51 mm) air space must be
reserved for all materials extending for any
continuous length surrounding the chimney.
See Figures 26 and 27 and charts “Framing
Dimensions for Ceiling and Roof” on page 10,
which specify minimum ceiling and roof di-
mensions.
Room Above
For new construction, to determine chimney
center line, use plumb line from roof or ceiling
above fireplace to center of flue collar on
fireplace.
Framing
Stud
Firestop Spacer
Figure 20
For remodeling, plumb to center of flue collar
from ceiling above, drive nail through ceiling
from below to mark position, then mark and
cut to passage from above ceiling (around
nail) (Figure 19 ). Then plumb from ceiling or
roof level directly above hole which has just
been completed.
Nailing
Flange
Attic Above
Firestop Spacer
Figure 18
Plumb Line
Figure 21
Note: The nailing tabs are exempt from the
fireplace clearances described on the fireplace
clearance label.
Step 4. Note: Chimney sections are con-
structed with a unique locking tab design
which ensures an immediate, tight assembly
between sections. Plan your chimney require-
ments carefully before assembly as chimney
is difficult to disassemble after installation. If
disassembled, the tabs might become dam-
aged. Be certain tabs are properly formed to
ensure tabs engage properly.
INSTALLING THE CHIMNEY SYSTEM
Step 1. Check flue damper for proper opera-
tion. To open, pull handle down and release.
Damperwillopenautomatically. Toclose, push
handle up. The damper should lock into the
closed position.
Note: The damper is set to one opening, but
may be switched if necessary.
Figure 19
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The FTF13 chimney system is a two-piece
chimney, which snaps together from the fire-
place up. Start with the inner flue section. With
the lanced end up, snap-lock it into the match-
ing collar on top of the fireplace. At all subse-
quent joints, the upper flue section fits into the
preceding flue section. Each piece snaps to-
gether by means of locking tabs (7 locking
tabs per joint). Check each piece by pulling up
slightly from the top to ensure proper engage-
ment before installing succeeding sections, If
the flue has been installed correctly, it will not
separate when you test it. Also, the inner flue
joint where each section is joined should be
tight and flat without gaps (Figure 22 ).
B
2" (51mm) Min. Air Space
to Combustibles
A
Ceiling Framing
Figure 24
Figure 26
Check vertical alignment of chimney pipe so
that it projects from the roof in a true vertical
position. Security's chimney sections do not
need to be screwed together. Additional rein-
forcement is not necessary, except in certain
offset conditions (see to page 16, Figure 47 ).
Framing Dimensions for Ceiling
Ceiling Opening
Flue Type
A
B
FTF13, Vertical
at 2" (51 mm)
19"
19"
(483 mm) (483 mm)
Step 5. The height of vertical chimney pipe
supported only by the fireplace must not ex-
ceed 30' (9.1 m). Chimney heights above 30'
(9.1 m) must be supported by a Model FTF13-
S4 stabilizer installed at 30' (9.1 m) intervals.
FTF13, Offset
At 2" (51 mm)
19" 29"
(483 mm) (737 mm)
Note:TheModelFTF13-S4adds3"(76mm)net
effective height to the total chimney system.
Figure 22
Install the Model FTF13-S4 stabilizer by fitting
inner section down into respective section of
proceeding flue pipe and locking outer stabi-
lizer section into place over the outer chimney
pipe. Position for proper clearance through
framed opening and nail straps securely (un-
der tension in “shear”) into place on framing.
Use 8d nails. Attach successive lengths of
chimney pipe directly to stabilizer using same
techniques as described in Step 4 (Figure 25 ).
Outer pipe section installs in just the opposite
way; the lanced end goes down and each new
section goes OVER the outside of the previous
section installed (Figure 23 ).
D
C
Roof Framing
Figure 27
Locking Tabs
(Lances)
Framing Dimensions for Roof
FTF13 at 2" (51 mm)
Pitch
C
D*
0/12
6/12
12/12
19"
(483 mm)
19"
(483 mm)
Figure 23
FTF13-S4 Stabilizer
19"
(483 mm)
20"
(508 mm)
Note: Assemble one component of chimney at a
time (inner section first, then outer section last)
beforeproceedingwiththenextcompletesection.
Figure 25
19"
(483 mm)
27"
(686 mm)
Note: Do not apply excessive pressure to any
subsequent chimney sections following the
stabilizer when installing. Ensure each subse-
quent chimney section is securely attached by
testing as noted in Step 4.
* Perpendicular to Roof Ridge.
Continue to assemble the chimney up through
framedceilingopening. Assemblejustenough
to penetrate the roof flashing openings (Figure
24 ). Alwaysmaintain2"(51mm)minimumair
space to combustible materials and always
check each pipe joint (inner and outer) to
ensure proper engagement.
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Step 6. Select proper Security Chimneys roof
flashingbasedonpitchofroof. Usechartbelow
for selection:
Step 8. The standard Security Chimneys FTF10
roof flashing assembly includes a storm collar.
Slide storm collar over outer chimney, align
with top surface of flashing, insert storm tab in
slot, pull tight and bend tab back over slot. Seal
storm collar to outer chimney with roof caulk-
ing or mastic around entire circumference of
pipe. Also add extra roof caulking where storm
collar meets flashing and to the tab/slot area to
seal completely against water penetration (Fig-
ure30).Checkalljointsverycarefullytoensure
no water intrusion can take place.
Step 10. Using an FTF13-CTD Round Ter-
mination:
1. Hold FTF13-CTD over top of last chimney
section (see Figure 32 ).
Roof Pitch
FTF10
F10-F6
F10-F12
Flat to 6/12
6/12 to 12/12
2. Center inner slip section in inner flue pipe-
slip down.
3. Center outer locking section over outer flue
pipe. Push down until locking tabs are firmly
engaged.
Next,slideroofflashingoverextendedchimney
sectionthatpreviouslyhasbeeninstalledabove
the roof opening in Step 4. FTF10 flashings
require flashing spacers. Slide flashling all the
way down until the flashing base rests flat on
the roof (Figure 28 ). Again, check the vertical
position of the chimney and the 2" (51 mm)
minimum air space to combustibles.
4. Pull up slightly on CTD to ensure locking
joint has firmly engaged.
Locking Band
Mastic
20"
Note: Do not caulk or seal the ventilating
openings.
(508mm)
FTF13 Chimney
Do Not Seal
Figure 30
Step 9. Security Chimneys locking band,
Model FLB, may be required if the chimney
extends too high above the roof flashing. As
a general rule, if the chimney extends more
than 6' (1.8 m) above the roof/flashing, the
useoflockingbandsisadvisabletostrengthen
the chimney joints. Align the locking band at
the pipe joint. Locking bands wrap around
pipe joints equally covering the joints of both
pipe sections. Use nut provided and TIGHTEN
snugly. Do not over tighten as this might
damage chimney section (Figure 30 ).
FTF10 Flashing
Figure 32
Using a FTF13-CTDT Chase Termination:
Refer to specific installation instructions in-
cluded with the FTF13-CTDT chase termination
for clearance and installation details.
Figure 28
Step 7. Secure flashing by nailing along the
perimeter into roof using 8d nails. If shingled
roof, slide upper end and sides of roof flashing
under shingles (trim if necessary), seal the top
and both sides of the flashing to the roof with
roofcaulking. Covernailheadswithroofcaulk-
ing (Figure 29 ).
Using a FTF13-CT1 Chase Termination:
Refer to specific installation instructions in-
cluded with FTF13-CT1 chase terminations for
clearance and installation details.
Note: If chimney extends more than 8' (2.4 m)
above roof surface, guy wires are also recom-
mended. Use three (3) guy wires, attach to
locking band assembly, extend and secure to
roof in a triangular pattern (Figure 31 ). Guy
wires are not supplied by the manufacturer.
Using a FTF13-CT2 Chase Termination:
Refer to specific installation instructions in-
cluded with FTF13-CT2 chase terminations for
clearance and installation details.
Roof Ridge
Note: It is recommended that all exterior ex-
posed metal fireplace components; such as ter-
minations, flashings, storm collars and/or flue
be painted with a premium quality, high tem-
perature, rust preventative paint designed for
metal. This is especially important when instal-
lationsaremadeinabnormallyadverseorcorro-
siveenvironments;suchasnearlakes,oceansor
in areas with consistently high humidity condi-
tions. Consult the paint manufacturers instruc-
tions for proper preparation and application.
Figure 29
120°
Figure 31
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2. Determine the number of chimney compo-
nents required, except chimney sections. This
would include firestop spacers, stabilizers,
roof flashing, etc.
Less Than 10' (3m)
2' Min. (610mm) 2' Min. (610mm)
3. The effective heights of the components are:
LS43ST Fireplace
=
58 ¹⁄₂" (1486 mm)
2' Min.
(610mm)
FTF13-12
FTF13-18
=
=
10 ¹⁄₄" (260 mm)
3' Min.
(916mm)
16 ¹⁄₄" (413 mm)
FTF13-36
=
=
=
=
34 ¹⁄₄" (870 mm)
4" (102 mm)
CTD Termination
CT1 Termination
CT2 Termination
Figure 33
18" (457 mm)
TEN FOOT RULE SUMMARY
18"
15" to 23"
(457mm)
(381 mm – 584 mm)
The minimum chimney height above the roof
and/ortoadjacentwallsandbuildingsisspeci-
fied by all major building codes.
18"
(457mm)
CTDT Termination
=
12" to 18"
(305 mm – 457 mm)
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.
S4 Stabilizer *
=
3" (76 mm)*
* Required for every 30' (9.1 m) of vertical
chimney and 10' of offset chimney.
24"
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.
(610mm)
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.)
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.
Reference Vertical Elevation Chart and deter-
minethenumberofchimneysections(quantity
and length) required.
FTF13 CHIMNEY COMPONENT
CALCULATIONS
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 ).
SPECIAL OFFSET INSTRUCTIONS
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 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.
MULTIPLE TERMINATIONS
To determine the number of chimney sections
and chimney components required, follow
these steps:
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
staggeredverticallyatleast18"(410mm)apart,
from the termination of one smoke exit to the
termination of another smoke exit (Figure 34 ).
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.
12
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FTF13 VERTICAL ELEVATION CHART
Height Of
Chimney Only
Number Of FTF13
Chimney Lengths
Height Of
Chimney Only
Height Of
Chimney Only
Number Of FTF13
Chimney Lengths
Height Of
Chimney Only
Inches Feet/Inches 12"
18"
36"
MM
M
Inches Feet/Inches 12"
18"
36"
MM
M
11
17
21 ¹⁄₄
27 ¹⁄₄
33 ¹⁄₄
35
0
1
1
2
2
2
3
3
4
4
5
5
5
6
7
7
7
8
9
9
11
5
9 ¹⁄₄
3 ¹⁄₄
9 ¹⁄₄
11
1 ¹⁄₄
7 ¹⁄₄
3 ¹⁄₄
7 ¹⁄₄
1 ¹⁄₄
7 ¹⁄₄
9 ¹⁄₄
7 ¹⁄₄
1 ¹⁄₄
5 ¹⁄₂
11 ¹⁄₂
7 ¹⁄₄
5 ¹⁄₂
11 ¹⁄₂
1
0
2
1
0
0
2
1
0
2
1
0
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
1
0
1
2
0
1
2
1
0
1
2
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
0
0
0
0
0
1
0
0
1
1
1
1
2
2
2
2
2
3
3
3
3
3
4
4
4
4
4
5
5
5
5
5
6
6
6
6
6
7
7
7
7
7
8
8
8
8
8
9
279
432
540
692
845
889
946
0.28
0.43
0.54
0.69
0.85
0.89
0.95
1.10
1.30
1.40
1.56
1.71
1.76
2.01
2.17
2.27
2.43
2.62
2.88
3.03
3.14
3.30
3.49
3.75
4.91
4.01
4.17
4.36
4.62
4.78
4.88
5.03
5.23
5.48
5.64
5.75
5.90
6.10
6.36
6.51
6.62
6.77
6.97
7.23
7.38
7.49
7.64
7.84
8.10
8.25
8.35
8.50
8.71
8.96
9.11
9.22
9.37
9.57
9.83
9.98
10.09
10.24
10.44
10.70
10.85
10.96
11.11
11.31
11.57
461 ¹⁄₂
465 ¹⁄₂
471 ¹⁄₂
479 ¹⁄₂
489 ¹⁄₂
495 ¹⁄₂
499 ³⁄₄
505 ³⁄₄
513 ¹⁄₂
523 ³⁄₄
529 ³⁄₄
534
38 5 ¹⁄₂
38 9 ¹⁄₂
39 3 ¹⁄₂
39 11 ¹⁄₂
40 9 ¹⁄₂
41 3 ¹⁄₂
41 7 ³⁄₄
42 1 ³⁄₄
42 9 ¹⁄₂
43 7 ³⁄₄
44 1 ³⁄₄
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
2
1
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
0
1
0
1
0
13
13
13
14
14
14
14
14
15
15
15
15
15
16
16
16
16
16
17
17
17
17
17
18
18
18
18
18
19
19
19
19
19
20
20
20
20
20
21
21
21
21
21
22
22
22
22
22
23
23
23
23
23
24
24
24
24
24
25
25
25
25
25
26
26
26
26
26
27
11722
11824
11976
12179
12433
12586
12694
12846
13043
13303
13456
13564
13716
13913
14173
14326
14434
14586
14783
15043
15196
15297
15450
15653
15907
16059
16167
16320
16516
16777
16929
17037
17189
17386
17647
17799
17907
18059
18256
18517
18669
18771
18923
19126
19380
19533
19641
19793
19990
20250
20403
20511
20663
20860
21120
21273
21380
21533
21730
21990
22142
22244
22396
22600
22854
23006
23114
23266
23470
11.72
11.82
11.98
12.18
12.43
12.59
12.69
12.85
13.04
13.30
13.46
13.56
13.71
13.91
14.17
14.33
14.43
14.59
14.78
15.04
15.20
15.30
15.45
15.65
15.91
16.06
16.17
16.32
16.52
16.78
16.93
17.04
17.19
17.39
17.65
17.80
17.91
18.06
18.26
18.52
18.67
18.77
18.92
19.13
19.38
19.53
19.64
19.79
19.99
20.25
20.40
20.51
20.66
20.86
21.12
21.27
21.38
21.53
21.73
21.99
22.14
22.24
22.40
22.60
22.85
23.01
23.11
23.27
23.47
37 ¹⁄₄
43 ¹⁄₄
51 ¹⁄₄
55 ¹⁄₄
61 ¹⁄₄
67 ¹⁄₄
69 ¹⁄₄
79 ¹⁄₄
85 ¹⁄₄
89 ¹⁄₂
95 ¹⁄₂
103 ¹⁄₄
113 ¹⁄₂
119 ¹⁄₂
123 ³⁄₄
129 ³⁄₄
137 ¹⁄₂
147 ³⁄₄
153 ³⁄₄
158
164
171 ³⁄₄
182
188
192
198
206
215 ³⁄₄
222
226 ¹⁄₄
232 ¹⁄₄
240
250 ¹⁄₄
256 ¹⁄₄
260 ¹⁄₂
266 ¹⁄₂
274 ¹⁄₄
284 ¹⁄₂
290 ¹⁄₂
294 ³⁄₄
300 ³⁄₄
308 ¹⁄₂
318 ³⁄₄
324 ³⁄₄
328 ³⁄₄
334 ³⁄₄
342 ³⁄₄
352 ³⁄₄
358 ³⁄₄
363
1099
1302
1403
1556
1708
1759
2013
2165
2273
2426
2622
2883
3035
3143
3296
3493
3753
3905
4013
4166
4362
4623
4775
4877
5029
5232
5480
5639
5747
5899
6096
6356
6509
6617
6769
6966
7226
7379
7487
7639
7836
8096
8249
8350
8503
8706
8960
9112
9220
9373
9569
9829
9982
10090
10243
10439
10700
10852
10960
11113
11309
11570
44
45
6
0
540
547 ³⁄₄
558
45 7 ³⁄₄
46
47
6
0
564
568 ¹⁄₄
574 ¹⁄₄
582
47 4 ¹⁄₄
47 10 ¹⁄₄
48
6
592 ¹⁄₄
598 ¹⁄₄
602 ¹⁄₄
608 ¹⁄₄
616 ¹⁄₄
626 ¹⁄₄
632 ¹⁄₄
636 ¹⁄₂
642 ¹⁄₂
650 ¹⁄₄
660 ¹⁄₂
666 ¹⁄₂
670 ³⁄₄
676 ³⁄₄
684 ¹⁄₂
694 ³⁄₄
700 ³⁄₄
705
711
718 ³⁄₄
729
735
739
745
753
763
769
49 4 ¹⁄₄
49 10 ¹⁄₄
50 2 ¹⁄₄
50 8 ¹⁄₄
51 4 ¹⁄₄
52 2 ¹⁄₄
52 8 ¹⁄₄
53 0 ¹⁄₂
53 6 ¹⁄₂
54 2 ¹⁄₂
55 0 ¹⁄₂
55 6 ¹⁄₂
55 10 ³⁄₄
56 4 ³⁄₄
57 0 ¹⁄₂
57 10 ³⁄₄
58 4 ³⁄₄
10 3 ³⁄₄
10 9 ³⁄₄
11 5 ¹⁄₂
12 3 ³⁄₄
12 9 ³⁄₄
13
13
2
8
14 3 ³⁄₄
15
15
16
16
17
2
8
0
6
2
17 11 ³⁄₄
18
18 10 ¹⁄₄
19 4 ¹⁄₄
20
6
58
59
9
3
0
20 10 ¹⁄₄
21 4 ¹⁄₄
21 8 ¹⁄₂
22 2 ¹⁄₂
22 10 ¹⁄₄
23 8 ¹⁄₂
24 2 ¹⁄₂
24 6 ³⁄₄
25 0 ³⁄₄
25 8 ¹⁄₂
26 8 ³⁄₄
27 0 ³⁄₄
27 4 ³⁄₄
27 10 ³⁄₄
28 6 ³⁄₄
29 4 ³⁄₄
29 10 ³⁄₄
59 10 ³⁄₄
60
61
61
62
62
63
64
9
3
7
1
9
7
1
773 ¹⁄₄
779 ¹⁄₄
787
64 5 ¹⁄₄
64 11 ¹⁄₄
9
9
9
9
65
7
797 ¹⁄₄
803 ¹⁄₄
807 ¹⁄₂
813 ¹⁄₂
821 ¹⁄₄
831 ¹⁄₂
837 ¹⁄₂
841 ³⁄₄
847 ³⁄₄
855 ¹⁄₂
865 ³⁄₄
871 ³⁄₄
875 ³⁄₄
881 ³⁄₄
889 ³⁄₄
899 ³⁄₄
905 ³⁄₄
910
66 5 ¹⁄₄
66 11 ¹⁄₄
67 3 ¹⁄₂
67 9 ¹⁄₂
68 5 ¹⁄₄
69 3 ¹⁄₂
69 9 ¹⁄₂
70 1 ³⁄₄
70 7 ³⁄₄
71 3 ¹⁄₂
72 1 ³⁄₄
72 6 ³⁄₄
72 11 ³⁄₄
73 5 ³⁄₄
74 1 ³⁄₄
74 11 ³⁄₄
75 5 ³⁄₄
75 10
10
10
10
10
10
11
11
11
11
11
12
12
12
12
12
13
13
30
30
3
9
369
376 ³⁄₄
387
31 4 ³⁄₄
32
32
33 1 ¹⁄₄
33 7 ¹⁄₄
3
9
393
397 ¹⁄₄
403 ¹⁄₄
411
421 ¹⁄₄
427 ¹⁄₄
431 ¹⁄₂
437 ¹⁄₂
445 ¹⁄₄
455 ¹⁄₂
34
3
35 1 ¹⁄₄
35 7 ¹⁄₄
35 11 ¹⁄₂
36 5 ¹⁄₂
37 1 ¹⁄₄
37 11 ¹⁄₂
916
924
76
77
4
0
13
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FTF13 OFFSET ELEVATION CHART
A
B
FTF13-ES30
Offset/Return FTF13-S4
Number of FTF13
Chimney Sections
A
B
Offset
Height
Offset
Height
(Inches) (Inches)
Elbow Set
Stabilizer
12"
18"
36"
(mm)
(mm)
4
9
12
14 ¹⁄₄
17 ¹⁄₄
20 ¹⁄₄
21
15 ³⁄₄
24 ¹⁄₂
29 ³⁄₄
33 ¹⁄₂
38 ¹⁄₂
43 ³⁄₄
45 ¹⁄₄
47 ¹⁄₂
52 ¹⁄₂
54 ¹⁄₄
57 ³⁄₄
59 ¹⁄₄
63
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
1
1
1
1
1
1
1
1
1
1
0
1
0
2
1
0
0
2
1
1
0
0
2
4
1
3
0
0
2
1
1
3
0
0
2
1
1
0
0
2
1
1
0
2
1
1
0
2
1
3
0
1
0
0
1
0
1
2
0
1
2
0
3
1
0
1
1
0
2
0
1
4
0
1
3
1
0
5
1
2
0
1
2
0
1
0
3
1
2
1
0
1
1
1
0
0
0
0
0
0
1
0
0
1
0
1
1
0
1
1
1
2
1
0
2
1
1
2
2
0
2
2
3
2
2
3
3
3
2
3
3
3
4
3
4
4
102
229
305
362
438
514
533
565
641
667
718
743
794
826
870
921
946
400
622
756
851
978
FTF13-E30
Return Elbow*
1111
1149
1207
1334
1378
1467
1505
1600
1651
1734
1822
1861
1905
1956
2045
2127
2178
2223
2261
2324
2400
2483
2616
2654
2705
2838
2965
3099
3188
3264
3321
3454
3543
3715
3766
3848
4070
FTF13 Chimney
Sections
22 ¹⁄₄
25 ¹⁄₄
26 ¹⁄₄
28 ¹⁄₄
29 ¹⁄₄
31 ¹⁄₄
32 ¹⁄₂
34 ¹⁄₄
36 ¹⁄₄
37 ¹⁄₄
38 ¹⁄₄
39 ¹⁄₄
41 ¹⁄₂
43 ¹⁄₄
44 ¹⁄₂
45 ¹⁄₄
46 ¹⁄₄
48 ¹⁄₄
49 ¹⁄₂
51 ¹⁄₄
54 ¹⁄₄
55 ¹⁄₄
56 ¹⁄₂
59 ¹⁄₂
62 ¹⁄₂
65 ³⁄₄
67 ³⁄₄
69 ³⁄₄
70 ³⁄₄
73 ³⁄₄
75 ³⁄₄
79 ³⁄₄
81
A
B
FTF13-30
Offset Elbow*
65
68 ¹⁄₄
71 ³⁄₄
73 ¹⁄₄
75
972
997
77
80 ¹⁄₂
83 ³⁄₄
85 ³⁄₄
87 ¹⁄₂
89
91 ¹⁄₂
94 ¹⁄₂
97 ³⁄₄
1054
1099
1130
1149
1175
1226
1257
1302
1378
1403
1435
1511
1588
1664
1721
1772
1797
1873
1924
2026
2057
2102
2229
58 ¹⁄₂"
(1486 mm)
103
104 ¹⁄₂
106 ¹⁄₂
111 ³⁄₄
116 ³⁄₄
122
125 ¹⁄₂
128 ¹⁄₂
130 ³⁄₄
136
139 ¹⁄₂
146 ¹⁄₄
148 ¹⁄₄
151 ¹⁄₂
160 ¹⁄₄
* Part of Offset/Return Package, Model FTF13-ES30.
Figure 35
82 ³⁄₄
87 ³⁄₄
A1
A2
A2
C2
C2
20' Max.
(6m)
Stabilizer
B2
B2
B1
A1
A1
10' Max.
(3m)
B1
B1
C1
C1
Figure 36
Figure 37
Figure 38
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
14
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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'
(6.1 m) in total length between elbows (see
Figure 36 ). If sections of pipe exceed 10' (3 m)
between elbows, a chimney stabilizer must be
used at the midpoint. The stabilizer support
straps must be attached under tension (in
shear) to structural framing members above.
When two sets of offset elbows are used, the
maximum combined length of chimney used
between elbows cannot exceed 20' (6.1 m)
(see Figures 37 and 38 ). Example: If C1 = 10'
(3m) then C2 cannot exceed 10' (3 m).
Maximum offset of the chimney system is 30°.
Two offset elbows 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 system
exceeds 22' (5.6 m).
OFFSET ELBOW ASSEMBLY
Offset elbows install the same as chimney
sections. First, snap the inner section INTO the
preceding inner section of flue. Check connec-
tion by pulling up slightly to ensure a tight fit.
Next, the outer sections snap locks OVER the
preceding outer section of chimney. Again,
check outer section by pulling up slightly to
ensure proper connection is made.
Return elbow support straps must be securely
attached under tension (in shear) to structural
framing members above.
OFFSET CALCULATIONS
RETURN ELBOW ASSEMBLY
1. Use Offset Chart to determine amount of
horizontal offset (A) and height (B) for various
chimney sections.
Return elbows install the same way as round
terminations and stabilizers:
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
mental screw located at the underside of the
joint (Figure 39 ).
Step 1. Hold return elbow over top of last
chimney section.
2. Use “Height of Chimney Only” column to
determine combinations of pipe used above
return elbow to achieve desired heights. Refer-
ence Components Effective Height Chart in
vertical elevation chart section.
Step 2. Center inner slip section into inner flue
pipe-slip down.
Step 3. Center outer locking section over outer
chimneypipe-pushdownuntillockingjointhas
firmly engaged.
3. Use Elevation Chart as job estimator only.
Add necessary firestop spacers and stabilizers
as required. Firestop spacers must be used as
shown in Figures 20 and 21 and stabilizers as
shown in Figure 25.
Joints
Step 4. Pull up slightly on return elbow to
ensure locking joint has firmly engaged.
Chimney
Section
4'
INSTALLING OFFSETS
Step 5. Secure support straps to framing
members by nailing under tension in sheer
(Figure 41 ).
No. 8 x ¹⁄₂" SMS
First, review Offset Elevation Chart and Figure
35 on page 14 for reference.
6'
Step 1. Determine the offset distance where
chimney is to pass through the first ceiling-
dimension “A.” To find this point on your ceil-
ing, first determine the center point for a verti-
cal chimney following the instructions for ver-
tical installation.
Figure 39
A ¹⁄₈" (3 mm) diameter hole must be drilled in
the chimney joint using a ¹⁄₈" (3 mm) diameter
drill. Hole should be drilled in center of joint
overlap(Figure40).Besuretodrillonlythrough
the outer chimney casting. Do not puncture the
inner flue.
Return Elbow
Measure height to the ceiling from the top of
fireplace-dimension “B.” Use Offset Elevation
Chart to find dimension “A.” Mark point where
you will drive your nail to show the center point
for your offset ceiling cut.
Figure 41
Note: The return elbow assembly performs the
same function as a stabilizer. Consider this
when determining the need for a stabilizer.
Step2.ProceedbyusingtheStraightUpInstal-
lation Instructions for cutting and framing ceil-
ing and roof openings.
Note: Do not apply excessive pressure to any
subsequent chimney section following return
elbow assembly when installing. Ensure sub-
sequentchimneysectionsaresecurelyattached
by testing as noted above.
Note: See “Framing and Dimension” Chart for
the sizes of the ceiling and roof openings. The
size of the roof opening varies with the degree
of pitch of the roof.
Underside of Chimney
Figure 40
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
15
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CAUTION: REMOVE THE PLASTIC PROTEC-
TIVE COATING FROM THE DOORS BRASS
PIECES BEFORE ASSEMBLY AND INSTALLA-
TION. FAILURE TO REMOVE THE COATING
BEFORE FIRST USE WILL RESULT IN DAM-
AGE TO THE BRASS FINISH.
CHIMNEY OFFSET 30° THROUGH FLOOR
OPTIONAL EQUIPMENT
Combustion Air Kit
OR CEILING
It may be necessary to assemble the chimney
at 30° when passing through the floor or
ceiling area. Use the F10FS30-2 firestop
spacer as shown in Figures 42 and 43.
Use combustion air kit, Model FOAK-4 or
FOAK-4LD (Figure 46 ), with these fireplace
systems. Refer to installation instructions
packed with the air kit for specific information.
Outside air drawn into the fireplace supplies air
to the fire for combustion. The outside air kit
must be installed before the fireplace is framed
and enclosed in the finished walls.
Make a careful inspection of all parts before
installing the doors to insure they are un-
damaged and complete. Always use two (2)
glass door assemblies for each side of the
LS43ST fireplace.
Support the chimney at floor or ceiling pen-
etration with a FTF13 stabilizer if distance of
chimney below ceiling is 10' (3 m) or more.
Maintain 2" (51 mm) minimum air space to
combustibles from chimney sections. The
chimney must pass vertically through the
attic space.
IMPORTANT: ALTHOUGH THE COMBUSTION
AIR KIT IS DESIGNATED AS AN OPTIONAL
ACCESSORY IT IS HIGHLY RECOMMENDED
THAT IT BE INSTALLED. DUE TO THE OPER-
ATING CHARACTERISTICS OF MULTI-OPEN
FIREPLACES, A PROPERLY INSTALLED
SOURCEOFOUTSIDECOMBUSTIONAIRCAN
ENHANCE THE OPERATING PERFORMANCE
OF THE APPLIANCE. THE COMBUSTION AIR
KIT IS NOT REQUIRED FOR THE SAFE OP-
ERATION OF THE LS43ST.
CAUTION: DO NOT TOUCH THE DOORS WITH
YOUR HANDS WHILE THE FIREPLACE IS IN
USE. ALWAYS USE DOOR HANDLES.
DOORS WILL BECOME VERY HOT WHEN
FIREPLACE IS IN USE.
Attic Space
F10FS30-2
2" (51mm)
Firestop
Min. Air
Spacer
Note: Designcharacteristicsofadual-opening
fireplace (whether masonry or factory-built)
may cause it to not draft properly and smoke.
For this reason, glass doors are required with
the LS43ST fireplace.
Space
FTF13-S4
Stabilizer
2" (51mm)
Min. Air
Space
There is a one-hand operated shut-off valve
located on each side of the fireplace opening
behind the screen. Refer to label for directions
of operation. The combustion air damper
should be fully open when the fireplace is in
operationandfullyclosedwhenthefireplaceis
not in use to prevent outside air from entering
your home.
10'
WARNING: THESE FIREPLACES
SHOULD BE OPERATED ONLY WITH
THE DOORS FULLY OPEN OR FULLY
CLOSED (FIGURES 44 AND 45 ). IF
DOORS ARE LEFT PARTLY OPEN, GAS
AND FLAME MAY BE DRAWN OUT OF
THE FIREPLACE OPENING, CREATING
RISKS OF BOTH FIRE AND SMOKE.
(3m) Max.
30° Firestop
and Attic Above
Figure 42
Room Above
F10FS30-2
2" (51mm)
Min. Air
Space
Firestop
Spacer
If additional length of duct is necessary,
purchase locally available 4 inch diameter
(12.5 in.²) Class 0 or Class 1 ducting. The
duct may extend up to 50' (15.2 m) in any
direction.
FTF13-S4
Stabilizer
2" (51mm)
Min. Air
Space
10'
Combustion
Air Kit
30° Firestop
and Room Above
(3m) Max.
Figure 43
GLASS DOORS
Glass Doors
Fully Open
The LS43ST fireplace require the use of glass
doors. The selection of glass doors available
for use with these fireplace are: 43LSBF,
43LSBF-B, 43LBF, 43LBF-BB, 43LBF-BS and
43TBA. The use of any other non-listed door
on these fireplaces may result in a potential
fire hazard and is not recommended.
Figure 44
Figure 46
Outside combustion air may be run upwards
orverticallythroughframingandceilingjoists,
with the hood installed through an outside wall
and 3' (914 mm) below the termination. Duct-
ing may also be run downward through floor
joists and under the home to a ventilated
crawlspace not considered part of the living
area of the home.
IMPORTANT: IT IS NECESSARY TO ORDER
AND INSTALL THE DOOR STYLE OF YOUR
CHOICE.GLASSDOORSARENOTOPTIONAL.
Glass Doors
Fully Closed
Figure 45
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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CAUTION: NEVER LOCATE THE AIR INLET
WHERE IT COULD BE BLOCKED BY SHRUBS,
SNOW DRIFTS, ETC. NEVER LOCATE THE
AIR INLET IN GARAGE OR ANY AREA WHERE
THERE IS ANOTHER FUEL BURNING APPLI-
ANCE OR PRODUCTS EMITTING COMBUS-
TIBLE GASES SUCH AS PAINT, GASOLINE,
ETC. IN COLD CLIMATES, IT IS RECOM-
MENDED THAT THE COMBUSTION AIR DUCT
BE INSULATED.
IMPORTANT:REPACKINSULATIONMATERIAL
IN SQUARE HOLE AROUND GAS LINE, INTE-
RIOR AND EXTERIOR, TO SEAL.
FIREPLACE FINISHES
Mantels and Trim
It is sometimes best to frame your fireplace
after it is positioned and the chimney is in-
stalled. Frame enclosure for chimney and
fireplace with 2 x 4’s (or heavier) lumber.
This provision is intended for connection to a
decorative gas appliance incorporating an au-
tomatic shut-off device and complying with the
Standard for Decorative Gas Appliances for
installation in vented fireplaces, ANSI Z21.60
(1991) or American Gas Association draft re-
quirementsforGas-FiredLogLightersforWood
Burning Fireplaces, Draft No. 4 dated August,
1993. Install in accordance with the National
Fuel Gas Code, ANSI Z223.1. This complies
with the revised U.L. 127 standard.
Note: The header may rest on the two (2) metal
top spacers on top of the unit but the header
must not be notched to fit around the spacers.
Note: Do not terminate combustion air kit in
attic space under any circumstances.
In installations, combustible mantels and trim
may be installed 12" (305mm) above the open-
ing as per NFPA 211, Section 7-3.3.3. and
Figure 47. If a mantel is of a noncombustible
material, it is exempt from the requirements as
long as it does not interfere with the operation
of glass doors.
CAUTION:INNOEVENTMAYTHETOTALDUCT
FOR BRINGING IN OUTSIDE AIR EXCEED 50'
(15.2 M).
CAUTION: WHEN USING THE DECORATIVE
GAS APPLIANCE, THE FIREPLACE DAMPER
MUST BE SET IN THE FULLY OPEN POSITION.
GAS LINE INSTALLATION
Vent Free Appliances
The LS43ST fireplace has been approved to
accept a ¹⁄₂" (13 mm) gas line for an approved
gas appliance. Always have the appliance in-
stalled by a qualified, licensed plumber in ac-
cordance with all local building codes. The gas
line may enter either end of the fireplace.
8"
Spacer
(203 mm)
Max.
These units have been tested and approved to
ANSI/IAS/AGA Z21.11.2 for use with unvented
gas appliances and complies with the stan-
dard for Factory-Built fireplaces, UL 127.
1 ¹⁄₂"
(38 mm)
False
Header
The unit has been tested for use with any
unventedgaslogsetshavingamaximumrating
of 40,000 BTU. The minimum mantle configu-
rations are outlined in Figure 47.
Combustible
Mantel
CAUTION:PLUMBINGCONNECTIONSSHOULD
ONLY BE PERFORMED BY A QUALIFIED, LI-
CENSEDPLUMBER.MAINGASSUPPLYMUST
BE OFF WHEN PLUMBING GAS LINE TO FIRE-
PLACE OR PERFORMING SERVICE.
12"
and Trim
(305 mm)
Min.
Finished Wall
11 ¹⁄₂"
(292 mm)
These fireplaces have been marked with a
maximum rating of 40,000 BTU to assure that
homeowners do not exceed the allowable lim-
its for all allowed installations of mantles.
If you’re installing a gas line, connect it before
the fireplace is framed and enclosed in the
finished wall. The gas knockout is determined
by a 1 ¹⁄₈" (29 mm) round indentation located
at the bottom and slightly off center in the side
refractories. THE KNOCKOUT IS ALWAYS RE-
MOVED FROM INSIDE THE FIREPLACE. DO
NOT REMOVE THE KNOCKOUT UNLESS YOU
ARE INSTALLING A GAS LINE. If removal is
attempted from the outer wrapper, side-re-
fractory damage may occur. With a medium-
sized hammer, lightly tap the surface of the
indentation. The refractory material is very
thin in this area and is easily removed. Once a
small hole has been made, continue tapping
until you have reached sufficient diameter for
the gas line to fit through. The entire knockout
does not have to be removed. Remove insula-
tion in the gas line channel.
Fireplace Opening
Typical Installation
NEVER INSTALL AN UNVENTED GAS LOG
SET WITH A BTU GREATER THAN 40,000.
Figure 47
Hearth Extensions and Wall Shields
COLD CLIMATE INSULATION
A hearth extension must be installed with
all fireplaces. It is to protect the combustible
floor in front of the fireplace from both radiant
heat and sparks. The hearth extension must
extend 12" beyond both sides of the fireplace
opening and 20" beyond the front (see Figure
48 ). Use a hearth extension constructed of a
durable noncombustible material having an
equal or better (lower k value) insulating value
of k = .84 BTU IN/FT2 HR °F or a thermal
resistance that equals or exceeds r = 1.19 HR
°F FT2/BTU IN. With these values, determine
the minimum thickness/material required us-
ing the formula and Page 18.
If you live in a cold climate, it is especially
important to seal all cracks around the fire-
place and wherever cold air could enter the
roomwithnoncombustiblematerial.Surround
material must be caulked where it meets the
black metal facing of the fireplace to avoid
cold air intrusion. Use noncombustible caulk-
ing material only on fireplace facing to seal.
Also, the outside air inlet duct should be
wrapped with noncombustible insulation to
minimize the formation of condensation. Do
not place insulation materials directly against
the chimney sections.
Install a ¹⁄₂" (13 mm) gas supply line through
fireplace wall for connection to a decorative
gas appliance inside the firebox. Outside, the
gas supply line must connect to a gas shut-off
valve usually recessed flush into the wall or
floor. The valve should be controlled by a
removable valve key for safety.
Note: 2" (51 mm) air space must be preserved
for all materials extending for any continuous
length adjacent to the chimney.
Note: Any noncombustible material whose k
value is less than .84 or whose r value is more
than 1.19 is acceptable.
It is especially important to insulate between
the studs of an outside chase cavity and under
the floor if the floor is above ground level. Do
not place insulation directly against the fire-
place or chimney system.
If the fireplace is installed on a combustible
floor, use the metal safety strips (provided)
on the floor extending half under the fire-
place and half under the hearth extension
(refer to Figures 6 & 7).
Always plumb gas line installation per local
codes. Check all connections with soap suds;
leaks will bubble. Never test any gas line con-
nection with a match or open flame.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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Hearth Extension Dimensions
A
B
C
D
20"
39-3/8"
12"
63-3/8"
C
C
B
D
Note: To convert inches to millimeters
divide by 0.03937
A
Figure 48
Answer - The minimum required thickness of the Micore 160 is .417”,
therefore round up to nearest standard thickness available which is 1/2”.
Methods of Determining Hearth Extension and Wall Shield
Equivalents - To determine the thickness required for the alternate
material when either the “k” value or “r” value is known, use either the
k formula or r formula.
Listed Material
k (per inch) r (per inch)
Listed Min.Thickness
Example: If Micore 160 is to be used for the hearth extension fireplace,
how thick must this material be?
Listed Material
.84
1.19
rL
1
"
KL
TL
kM = k value per inch of alternate material
** Approved Alternate Materials for Floor/Hearth Protection
rM = r value per inch of alternate material
TM = minimum thickness required for alternate material
TS = standard thickness of the alternate material
AlternativeMaterials
Thermal Values
MinimumThickness
(rounded to nearest 1/8 inch)
k (per inch) r (per inch)
Min. Thickness
KM
rM
TM
kL = k value per inch of listed material
rL = r value per inch of listed material
TL = minimum thickness of listed material
Kaowool M Board
.47
.35
2.13
2.86
.56" (1/2")
.42" (3/8")
Micore 160™
U.S. Gypsum
Micore 300™
U.S. Gypsum
.46
2.17
.52
.55" (1/2")
Note: An asterix “*” indicates, it is a value taken from Table 1.
Using the k formula:
Durock™ Cement Board
U.S. Gypsum
1.92
2.29" (2-1/4")
Minimum
thickness of
alternate
k-value (per Inch) of
alternate material (kM) x
k-value (per inch)
Specified min.
thickness
of listed
Hardibacker™
1.95
2.30
2.82
.513
.435
.355
2.32" (2-3/8")
2.74" (2-3/4")
3.36" (3-3/8")
=
Hardibacker 500™
material (TM)
of listed material (kM)
material (TL)
Cultered Stone Hearth-
stone™
TM (inches)
=
=
kM
*.84
x
TL
Wonderboard
3.23
.61
.31
3.85" (3-7/8")
.73" (3/4")
Super Firetemp M
Johns-Manville
1.64
TM (inches)
*.35
*.84
x
x
1"
1"
Super Firetemp L
Johns-Manville
.54
1.85
.64" (5/8")
Face brick
9.00
5.00
5.00
12.5
~11
.111
.20
10.71" (10-3/4")
5.95" (6")
.416 (inches) =
.416
Common brick
Cement mortar
Ceramic tile
Marble
.20
5.95" (6")
Answer - The minimum required thickness of the Micore 160 is .417”,
thereforerounduptoneareststandardthicknessavailablewhichis1/2”.
.08
14.88" (14-7/8")
13.10" (13-1/8")
~.09
Using the r formula:
Table 1
Minimum
thickness of
alternate
material
r-value (per Inch)
of listed material
r-value (per inch)
of alternate material
Specified min.
thickness
of listed
=
x
** If the hearth extension material(s) that is intended to be used is NOT listed
on Table 1, the material can still be used if the material(s) is noncombustible.
However, the manufacturer of the material must provide either the listed k-
value per inch or r-value per inch with listed thickness so that the minimum
thickness required for the hearth can be calculated (per instructions on this
Page and/or as specified in the NFI Certification manuals).
material
TM (inches)
TM (inches)
=
=
rL
rM
x
x
x
TL
1"
1"
Note:AlsoseeNFI(NationalFireplaceInstitute)CertificationManualsshowing
other acceptable calculation methods and acceptable alternate materials
which can be used.
*1.19
*2.86
.416 (inches) =
.416
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
18
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A wall shield is required where a continuous
perpendicular side wall is within 12" of the
fireplace opening (Figure 49 ). Use a 36" W x
36" H wall shield constructed of a durable,
noncombustible material having an equal or
better (lower k value) insulating value than k =
.54 BTU IN/FT2 HR °F. At no time may a
perpendicular side wall be located closer than
9" from the fireplace opening.
Next, a 3/4" marble slab set in 1/2" mortar cov-
ers the brick, “R” for the marble and mortar
becomes:
Seal all joints between the black facing and
wall surrounds to prevent cold air intrusion.
Use noncombustible caulking material only to
seal the black metal facing to the surround
material on the finished wall. Combustibles
may also project beyond the sides of the
fireplace opening as long as they are kept
within the shaded areas (refer to Figure 5 ).
marble
“R”M = rM x TS = 0.05 x 3/4" = .038
mortar
“R”M = rM x TS = 0.20 x 1/2" = .10
The sum of all “R values” is: .70 + .10 +. 038
+ .10 = .938
ACCESSORY PARTS AND COMPONENTS
LIST FOR THE LS43ST
If fireplace is installed diagonally across a 90°
corner; no wall shields are required.
This would NOT be an acceptable combination
of material for the hearth extension since the
total calculated “R value” of the materials used
is under the required “R value” of 1.19. An
additional layer of insulating materials must
be used.
The accessory parts and components shown
on pages 19 and 20 are to be used only with
your LS43ST fireplace system. Separate instal-
lation instructions are packaged with all com-
bustion air kits and chimney terminations.
Side Wall
12" (305 mm) Min.
to Fireplace Opening
Note: Also see NFI Certification Manuals for
expanded explanation on calculating “R val-
ues” when multiple materials are used.
If you encounter any problems or have ques-
tions concerning the installation or application
of this system, please contact your distributor.
For the name of your nearest distributor call:
WARNING: THE CRACK BETWEEN THE
FIREPLACE AND THE HEARTH EXTEN-
SION MUST BE SEALED WITH A NON-
COMBUSTIBLE MATERIAL.
C
LENNOX HEARTH PRODUCTS
1110 West Taft Avenue
Orange, CA 92865
B
D
A
C
Figure 49
INSTALLATION COMPONENTS
WARNING: WHEN INSTALLING HEARTH
EXTENSION IN FRONT OF THE FIRE-
PLACE,THEFIREPLACEMUSTBERAISED
IF HEIGHT OF HEARTH EXTENSION EX-
CEEDS8"ABOVEBOTTOMOFFIREPLACE
(FIGURE 50 ).
Calculating Minimum Thickness if Multiple
Materials are Used
The following items are available for use in the
installation of this appliance.
At times it is important to know what
combination of materials are acceptable for
use as floor protection. The “R values” are
used to determine acceptable combinations of
materialsbecause“Rvalues”areadditivewhere
r and k values are not.
“R value” = 1/k = “r” x thickness of material
used
8"
Example: Given that the required “R value”
for a suitable floor protector used must be
equal to or greater than:
(203 mm)
Max.
Outside Combustion Air Kits
(with duct)
81L87
81L88
FOAK
FOAK-LD
“R” = rL x TL = 1.19 x 1” = 1.19.”
(without duct)
Maximum Thickness of Hearth Extension
when Fireplace is on the Floor.
If it is desired to elevate a marble hearth ex-
tension to a level of 5” or more above the floor
surface. What combination of noncombustible
materials can be used to accomplish this?
Figure 50
FINISH TO YOUR TASTE
If common brick is used so that the 3 1/2” di-
mension is the height, “R” for the common
brick becomes:
There are a wide variety of “finished looks”
for your LS43ST fireplace from formal wall
decor with elaborate mantels to rustic wood
paneling or warm brick facings.
brick
“R”M = rM x TS = 0.20 x 3 1/2" = .70
Combination
Offset/Return Elbow
63L35
FTF13-OR15
Using 1/2” of mortar to set the brick, “R” for
the mortar is calculated as follows:
mortar
Only noncombustible materials like marble,
stone, tile, brick, etc. may overlap the black
front facing, but be careful not to interfere with
the operation of the glass doors.
Model
LS43ST
Part Number
Weight
400 lbs.
“R”M = rM x TS = 0.20 x 1/2" = .10
23M92
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
19
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INSTALLATION COMPONENTS
63L19
63L20
63L21
FTF13-12
FTF13-18
FTF13-36
Chase Termination
(Square)
Chase Termination
(Round)
63L54
FTF13-CT2
Chimney Section
63L44
FTF13-CTD
Chase Termination
(Round)
Chase Termination
(Square)
Offset/ Return
Package (30°)
63L47
FTF13-CTDT
63L50
FTF13-CT1
63L24
FTF13-ES30
63L40
63L41
F10F6
F10F12
Firestop Spacer (Flat)
63L36
F10FS-2
Storm Collar
63L59
FSC
Flashing
Firestop Spacer (30°)
63L37
F10FS30-2
Locking Band
63L60
FLB
Stabilizer
63L27
FTF13-S4
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
The manufacturer reserves the right to make changes at any time, without notice, in design, materials, specifications, prices and also to discontinue colors, styles and products.
Consult your local distributor for fireplace code information.
Printed in U.S.A. © 2002 by LENNOX HEARTH PRODUCTS
1110 West Taft Avenue
Orange, CA 92865
P/N 850,004M REV. F 10/2006
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