INSTALLATION
INSTRUCTIONS
ESTATE SERIES
48" Wood Burning Fireplaces
P/N 850,006M REV. D 05/2005
LENNOX HEARTH PRODUCTS
MODELS
EST-48
EST-48-H
This installation manual will enable you to obtain a safe, efficient and
dependable installation of your fireplace system. Please read and under-
stand 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
WH Report No. 629-915173
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Note: Illustrations shown reflect “typical” instal-
lations with nominal dimensions and are for
design and framing reference only. Actual instal-
lations may vary due to individual design prefer-
ences.However,alwaysmaintainminimumclear-
ances to combustible materials and do not vio-
late any specific installation requirements.
When complete these fireplace systems con-
sists of four basic “sub-systems”:
PRECAUTIONS
Note: These fireplace systems are not difficult
to install. However, in the interest of safety, it
is recommended that the installer be a quali-
fiedorcertified“tradesman”familiarwithcom-
monlyacceptedfireplaceinstallationandsafety
techniques as well as prevailing local codes.
1. The Fireplace
2. The Chimney and Termination
3. The Optional Glass Doors
4. The Optional Combustion Air Kits
Thesefireplaceshavebeentestedandlistedby
Warnock Hersey (Report No. 629-915173) to
U.L. standard 127. These units are intended
for installation in residential homes and other
buildings of conventional construction includ-
ing commercial, not in mobile homes.
CLEARANCES AND HEIGHT
REQUIREMENTS
The most important areas of concern dealing
with the installation of factory-built fireplaces
areclearancestocombustiblematerials,proper
assembly of component parts, height of the
chimney system, the proper use of accesso-
ries supplied by the manufacturer and the
techniques employed in using finishing mate-
rials applied to the wall surrounding the fire-
place, hearthextensionsandwallshields. 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.
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
pipe requires a minimum 2" air space to com-
bustibles, and the fireplace wrapper requires a
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
and in accordance with codes such as the
BOCA Basic/National Codes, the Standard Me-
chanicalCodeandtheUniformBuildingCodes.
minimum 1" air space to combustibles.
A
combustiblemantlemaybeinstalled12"above
the opening of the fireplace as per NFPA 211,
Section 7-2.3.3.
INTRODUCTION
General Information
The minimum installed height of the completed
fireplacesystemis15'6". Themaximumheight
is 80' 0".
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.
These fireplaces are conventional radiant heat
fireplaces with standard bar grates, optional
outside combustion air kits and optional deco-
rative glass doors.
The fireplace and chimney system must be
enclosed when installed in or passing through
alivingareawherecombustiblesorpeoplemay
come in contact with it. This is important to
prevent possible personal injury or fire hazard.
TYPICAL INSTALLATION
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 16 and 17 ).
Chimney and
Termination
CHIMNEY SYSTEM
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.
*Construction Materials:
• framing materials • paneling
• particle board
• millboard
• plywood
• flooring
• dry wall
• etc.
Figure 1
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Insulate Joists
19"
Note: Do not insulate the chase cavity with
blown or fill type insulation materials.
Same As Ceiling
(483mm)
19"
(483mm)
Damper
Closed
Damper
Open
Note: Local codes may not require firestopping
at the ceiling levels for outside chase installa-
tions. However, it is recommended for safety
and the reduction of heat loss.
Draft Stops
Combustion
Air Actuator
Chimney Height
The total height of your completed fireplace
system from the surface the fireplace rests on
to the chimney top must not exceed 80' and
mustalsomeetminimumheightrequirements.
Refer to the minimum system height chart.
F10FS-2
Firestop
FTF13-CT2
Figure 3
Termination
Note: Non-
Combustible
Chase
LOCATION OF FIREPLACE
Minimum System Height
Security's FTF13 Pipe
Flashing
must be
Used to
Cover
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.
Chase
Opening
Vertical Installation
One Offset
15' 6"
18' 0"
20' 0"
Optional
Insulation
in Outside
Walls of
Chase
Two Offsets
Chase Enclosure
A chase is a vertical box-like structure con-
structedtosurroundthefireplaceandchimney.
Refer to Figure 2 for a typical chase configura-
tion. As with all chimney installations, avoid
overhead obstructions such as trees, power
lines, etc. A chase should be constructed and
insulated just like any outside wall. In a cold
climate, we recommend the base of the chase
should also be insulated between the solid
continuous floor beneath the fireplace and the
chase bottom. Chase insulation in a cold cli-
mate installation is not required for safety.
8'
(2.4m)
Level
Hearth
Hearth
Solid
Continuous
Surface
Outside
Base
Insulation
(Thermal Barrier)
Optional
Figure 2
Outside Chase
Figure 4
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.
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.
ASSEMBLY OUTLINE
Before You Start
Check your inventory list to be sure you have all
the necessary parts supplied in good usable
condition.Checkalsoforanyconcealeddamage.
Whenlocatingthefireplace,considerationmust
be given to combustibles and final finishing.
See Figure 5 and confine the final location of
combustiblefinishmaterialstothe"SafeZone".
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.
WARNING: DO NOT PACK OR FILL RE-
QUIRED AIR SPACES WITH INSULATION
OR OTHER MATERIAL. NO MATERIAL IS
ALLOWED IN THESE AREAS.
DO NOT permanently place furniture or other
items such as decorative pillows within 60" of
the fireplace front face.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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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.
Black Portion Of Frame
Not To Be Covered With
Combustible Materials
Wall
Covering
Combustible
Wall
3 ¹⁄₄"
Usually, no special floor support is needed for
the fireplace, however, to be certain:
4 ³⁄₄"
¹⁄₂”
15°
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 18.
1"
Door
Opening
Hearth
Extension
Safe
Zone
12”
Metal Safety Strip
Floor
Figure 5
2. Measure the square footage of the floor
space to be occupied by the system, surrounds
and hearth extensions.
ASSEMBLY STEPS
Figure 6
Note: The following steps represent the normal
sequence of installation. Each installation is
unique, however, and might require a different
sequence.
3.Notethefloorconstruction,i.e.2x6’s,2x8’s
or 2 x 10’s, single or double joists, type and
thickness of floor boards.
Zero Clearance
to Rear and
Side Spacers
1"
4. Use this information and consult your local
building code to determine if you need addi-
tional support.
1. Position firebox prior to framing or into
prepared framing.
Combustible
Wall
2. Install the chimney system.
CAUTION: DO NOT BLOCK THE HEAT-CIRCU-
LATING AIR INLET AND OUTLET PORTS ON
FACE SIDES. DOING SO MAY RESULT IN A
POTENTIAL FIRE HAZARD.
Hearth
Extension
3. Install optional outside combustion air kit.
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.)
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.
Metal Safety Strip
Figure 7
Platform
Floor
5. Complete the installation, finish wall mate-
rial, surround and hearth extension to your
individual taste.
The safety strips should extend from front of
the fireplace at least 2" and should extend to be
at least flush with the sides. In the event a
wooden support is used to elevate the fireplace
abovethefloor,a“Z”typesafetystripshouldbe
fabricated and used to protect the front surface
ofthewoodsupportaswellasthefloorbeneath
the hearth extension (Figures 8 and 9 ). The
safety strips should be tacked down to prevent
possible movement.
INSTALLING THE FIREPLACE
6. Assemble and attach optional glass door
assembly.
Step 1. Slide the fireplace into prepared fram-
ing or position fireplace in its final position and
frame later.
Study the three dimensional illustration (Fig-
ure 1 ) to get a general idea of each element of
your fireplace system.
The fireplace may not be recessed into a com-
bustible floor. Maintain the floor to hearth
clearance established by the fireplace lower
front face.
PRE-INSTALLATION NOTES
Note: The “Z” type safety strip is not supplied.
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.
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.
Step 3. Refer to fireplace drawings and specifi-
cationsonpages6and7forframingdimensions
and details. Frame appliance enclosure as illus-
trated in Figures 11 through 14 on page 7.
Note: Safety strips are not required when fire-
place rests on a noncombustible surface.
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.
Note: Install the hearth extension only as illus-
trated.
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FIREPLACE SPECIFICATIONS
15"
8 ⁹⁄₁₆"
48"
2"
Metal Safety Strips
with 1" Overlap
45 ¹⁄₈"
28"
Figure 8
8 ⁹⁄₁₆"
59 ³⁄₈"
Platform
Front
14 ¹ꢀ₄"
14 ¹ꢀ₄"
2"
Special “Z” Metal Safety
Strips with 1" Overlap
1"
1"
Figure 9
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 SPACERS.
THE HEADER MAY BE IN DIRECT CONTACT
WITH THE TOP SPACERS BUT MAY NOT BE
SUPPORTED BY THEM.
53 ¹⁄₄"
53 ¹⁄₄"
Gas
Line
Combustion
Air Access
Access
11 ⁵⁄₈"
13 ³⁄₄"
Gas Line
Access
11 ¹⁄₈"
10"
10"
13 ³⁄₄"
Note: The framed depth, 29 ³⁄₄" (755 mm)
from a framed wall, must always be measured
from a finished surface. If a wall covering such
as drywall is to be attached to the rear wall,
then the framed depth must be measured from
the drywall surface. It is important that this
dimension be exact.
30 ³⁄₈"
30 ³⁄₈"
Left Side
Right Side
44 ¹⁄₂"
If the appliance is to be elevated above floor
level, a solid continuous platform must be
constructed.
15"
13 ¹ꢀ₄"
29 ³⁄₈"
The header may rest on the top metal spacers,
but must not be notched to fit around them.
12 ¹⁄₂"
Consult all local codes.
6"
⁵⁄₈"
Top View
Figure 10
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FRAMING SPECIFICATIONS
Framing Dimensions
Model EST-48
Back Wall of
Chase/Enclosure
Including Finising
Materials
FOAK Combustion
Air Kit - Optional
if any
A
59 ¹⁄₂" 1511 mm
D
B
C
D
E
F
G
J
53 ³⁄₈" 1346 mm
K
F
44 ꢀ⁄₂"
22 ¹⁄₄"
104"
1130 mm
565 mm
2641 mm
1321 mm
755 mm
806 mm
A
E
Rough
Framing Face
(Unfinished Shown)
52"
Corner Installation
29 ³⁄₄"
31 ³⁄₄"
B
Figure 14
K
73 ¹⁄₂" 1867 mm
A
Note: All framing dimensions calculated for 1/2"
dry wall at the fireplace face. If sheathing the
chaseorfinishingwithotherthicknessmaterials,
calculations will need to be made. False header
should be constructed of 2 x material only.
Figure 11
Back Wall of Chase/Enclosure
FOAK
Including Finising Materials if any
Combustion
Air Kit
Framing Dimensions for Ceiling
B
A
Flue Type
A
B
G
Ceiling Framing
FTF13 Vertical
19"
19"
(483 mm) (483 mm)
Figure 15
A
Rough
Framing Face
(Unfinished
Shown)
FTF13
Offset 30°
19"
29"
Inside Chase
(483 mm) (737 mm)
Figure 12
Framing Dimensions for Roof
Back Wall of Chase/Enclosure
Including Finising Materials
if any
FOAK
Combustion
Air Kit - Optional
Pitch
0/12
C
D*
C
19"
19"
(483 mm)
(483 mm)
G
J
6/12
19"
(483 mm)
22"
(559 mm)
C
A
Rough
D
Framing Face
12/12
19"
(483 mm)
27"
(686 mm)
Outside Chase
(Unfinished Shown)
Roof Framing
* Perpendicular to roof ridge
Figure 13
Figure 16
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CAUTION: ALLOW MINIMUM 2" CHIMNEY
AIRSPACETOCOMBUSTIBLEFRAMINGMEM-
BERS THROUGHOUT VERTICAL OR OFFSET
CHIMNEY INSTALLATION.
Room Above
Anchor Tab
A minimum 2" air space must be reserved for
all combustible materials extending for any
continuous length surrounding the chimney.
Firestop Spacer
Reference Figures 15 and 16 and charts Fram-
ing Dimensions for Ceiling and Roof, which
specify minimum ceiling and roof dimensions.
Figure 20
Attic Above
Figure 17
In new construction, to determine chimney cen-
terline, useplumblinefromrooforceilingabove
fireplace to center of flue collar on fireplace.
Step 4. The fireplace should be secured to the
side framing members using the nailing flange.
Use 8d nails (Figure 18 ).
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.
Firestop Spacer
Figure 21
Nailing
Flange
CHIMNEY 30° OFFSET THROUGH FLOOR
OR CEILING
Framing
Stud
8d Nail
Itmaybenecessarytoassemblethechimneyat
30° when passing through the floor or ceiling
area. Use the F10FS30-2 firestop spacer as
shown in Figures 22 and 23. Support the
chimney at floor or ceiling penetration with a
FTF10 stabilizer if distance of chimney below
ceiling is 10' or more. Maintain 2" minimum air
space to combustibles from chimney sections.
Plumb Line
Figure 18
Note: The nailing flange and the area directly
behind the nailing flange is exempt from the
clearancesdescribedonthefireplaceclearance
label.
Attic Space
F10FS30-2
2" Min.
Firestop Spacer
Air Space
Note: The nailing tabs and the area directly
behind the nailing tabs are exempt from the
clearances described on page 5. Maintain at
least 1/2" clearance from the firebox wrapper to
the framing at the closest point of contact,
directly adjacent to the flange.
Figure 19
FTF10-S4
2" Min.
Step 3. Position appropriate firestop spacer at
ceiling and nail temporarily with two (2) 8d nails.
Use flat firestop spacer, Model F10FS-2, if chim-
ney penetrates ceiling vertically. If chimney pen-
etrates ceiling at 30° angle (offset chimney), use
30° firestop spacer, Model F10FS30-2. Use one
nail 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.
Stabilizer
Air Space
10'
Max.
30° Firestop
And Attic Above
INSTALLING THE CHIMNEY SYSTEM
Figure 22
Step 1. Before continuing, check the operation
of the damper, as described on page 4, (refer to
Figure 3 ).
Room Above
F10FS30-2
2" Min.
Firestop Spacer
Air Space
Step 2. Using standard construction framing
techniques,constructopeningforchimneyroute
upthroughtheceiling(s)androoforthroughan
outside chase.
2" Min.
FTF10-S4
Stabilizer
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 ).
Air Space
Framing must maintain adequate minimum air
space clearance at all times.
30° Firestop
10'
Max.
And Room Above
Figure 23
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Step4.Note:Chimneysectionsareconstructed
with a unique locking tab design, which en-
sures an immediate, tight assembly between
sections.Planyourchimneyrequirementscare-
fully before assembly as chimney is difficult to
disassembleafterinstallation. Ifdisassembled,
the tabs might become damaged. Be certain
tabsareproperlyformedtoensurelockingtabs
engage properly.
Note: Assemble one component of chimney at
a time (inner section first, then outer section
last) before proceeding with the next complete
section.
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.
Continue to assemble the chimney up through
framed opening. Assemble just enough to pen-
etrate the roof flashing openings (Figure 26 ).
Always maintain 2" minimum air space to com-
bustiblematerialsandalwayscheckeachchim-
ney joint (inner and outer) to ensure proper
engagement. Checkverticalalignmentofchim-
ney so that it projects from the roof in true
vertical position.
Step 6. Select the proper Security Chimneys
roof flashing based on pitch of roof. Use chart
below for selection:
The Security Chimneys FTF13 chimney system
is a two piece chimney, which snap together
from the fireplace up. Start with the inner flue
section with the lanced end up, snap lock it in to
thematchingcollarontopofthefireplace. Atall
subsequent joints, the upper flue section fits
into the preceding flue section. Each piece
snaps together by means of locking tabs (9
locking tabs per joint). Check each piece by
pullingupslightlyfromthetoptoensureproper
engagement before installing the next section.
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 24 ).
Roof Pitch
Model
F10F6
Flat to 6/12
6/12 to 12/12
F10F12
Next,slideroofflashingoverextendedchimney
sectionthatpreviouslyhasbeeninstalledabove
the roof opening in Step 4. FTF10 flashings
require flashing spacers. Slide flashing 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" minimum air
space to combustibles.
2" Min. Air Space
To Combustibles
Figure 26
FTF13 Chimney
Do Not Seal
Security's chimney sections do not need to be
screwed together. Additional reinforcement is
not necessary except in certain offset condi-
tions (refer to page 12, Figure 36 ).
Flashing Spacers
FTF10 Flashing
Step 5. The height of vertical chimney pipe
supported only by the fireplace must not ex-
ceed 30'. Chimney heights above 30' must be
supported by a Model FTF13-S4 stabilizer in-
stalled at 30' intervals.
Figure 28
Note:TheModelFTF13-S4adds3"neteffective
height to the total chimney system.
Figure 24
Note:Donotcaulkorsealtheventilatingopenings.
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 25 ).
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
roof caulking. Cover nail heads with roof caulk-
ing (Figure 29 ).
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
framedopeningandnailstrapssecurely(under
tension in “shear”) into place on framing. Use
8d nails. Attach successive lengths of chimney
pipe directly to stabilizer using same tech-
niques as described in Step 4 (Figure 27 ).
Locking
Tabs
(Lances)
Figure 25
Stabiliezr
Figure 29
Note: F10 flashings and firestops are compat-
ible with FTF13 chimney.
Figure 27
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Step 8. The standard Security Chimneys F10
roofflashingassembliesincludeastormcollar.
Slide the storm collar over outer chimney, rest
on flashing spacers and align with top surface
offlashing. Inserttabinslot, pulltightandbend
tab back over slot. Seal storm collar to outer
chimney with roof caulking or mastic around
entire circumference of pipe. Also add extra
roof caulking to the tab/slot area to seal com-
pletely against water penetration (Figure 30 ).
Check all joints very carefully to ensure no
water intrusion can take place.
Step10.UsingaFTF13-CTDRoundTermination:
Note: It is recommended that all exterior ex-
posed metal fireplace components; such as
terminations, flashings, storm collars and/or
flue be painted with a premium quality, high
temperature, rust preventative paint designed
for metal. This is especially important when
installationsaremadeinabnormallyadverseor
corrosive environments; such as near lakes,
oceans or in areas with consistently high hu-
midity conditions. Consult the paint manufac-
turers instructions for proper preparation and
application.
1. HoldtheFTF13-CTDovertopoflastchimney
section (Figure 32 ).
2. Center inner slip section in inner flue pipe-
slip down.
TEN FOOT RULE SUMMARY
CTD
Termination
Chimney
Locking Band
Mastic
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', the top of the chimney
must be at least 2' above the peak of the roof.
Figure 32
3. Center outer locking section over outer flue
pipe. Push down until locking tabs are firmly
engaged.
If the horizontal distance from the chimney
edge to the peak of the roof is more than 10' a
chimney height reference point is established
on the roof surface 10' horizontally from the
chimney edge. The top of the chimney must be
at least 2' above this reference point. In all
cases, the chimney cannot be less then 3'
above the roof at the edge of the chimney.
4.PullupslightlyonCTDtoensurelockingjoint
has firmly engaged.
Figure 30
Using a FTF13-CT1 Chase Termination:
Step 9. Security Chimneys locking bands,
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' above the roof flashing, the use of locking
bands is advisable to strengthen the chimney
assembly. Align the locking band at the chim-
ney joint. Locking bands wrap around pipe
joints equally covering the joints of both pipe
sections. Use the nut provided and TIGHTEN
snugly. Do not overtighten as this might dam-
age the chimney section (refer to Figure 30 ).
Refer to specific installation instructions in-
cluded with FTF13-CT1 chase terminations for
clearance and installation details.
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, ad-
verse wind conditions, etc., may require a taller
chimney should the fireplace not draft properly
(see Figure 33 ).
Using a FTF13-CT2 Chase Termination:
Refer to specific installation instructions in-
cluded with FTF13-CT2 chase terminations for
clearance and installation details.
Less Than 10'
Note: If chimney extends more than 8' above
roof surface, guy wires are also recommended.
Use three (3) guy wires, attach to locking band
assembly, extend and secure to roof in a trian-
gular pattern (Figure 31 ). Guy wires are not
supplied by the manufacturer.
2' Min.
3'
Min
10'
3'
Min
Roof Ridge
Figure 33
120°
Figure 31
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
10
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3. The effective heights of various components
are:
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.
MULTIPLE TERMINATIONS
If more than one termination is located in the
samechaseorwithinthesamegeneralproxim-
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 ).
The Fireplace
FTF13-12
FTF13-18
FTF13-36
= 52 ¹⁄₂"
= 10 1/4"
= 16 1/4"
= 34 1/4"
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'.
FTF13-CTD termination = 4"
FTF13-CTDT termination = 12" to 18"
FTF13-CT1 termination = 12" to 18"
FTF13-CT2 termination = 15" to 23"
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-S4 stabilizer*
= 3"
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.
* 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).
18"
OFFSET CALCULATIONS
18"
Step 1. Use Offset Chart to determine amount
of horizontal offset (A) and height (B) for
various chimney section assemblies.
5. Reference the Vertical Elevation Chart and
determine the number of chimney sections
(quantity and length) required.
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.
SPECIAL OFFSET INSTRUCTIONS
24"
24"
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.
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.
Figure 34
FTF13 CHIMNEY COMPONENT
CALCULATIONS
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 C1
= 10' then C2 cannot exceed 10'.
The minimum installed height of the EST-48
fireplaces system is 15' 6", higher with offsets.
The maximum height for the system is 80'.
A1
Return
Elbow
To determine the number of chimney sections
andchimneycomponentsrequired,followthese
steps:
20'
Max.
B1
1. Determine the total vertical height of the
fireplaceinstallation.Thisdistanceismeasured
from the surface the fireplace rests on to the
point where smoke exits the termination.
Stabilizer
10' Max.
2. Determine the number of chimney compo-
nents required, except chimney sections. This
wouldincludefirestopspacers,stabilizers,roof
flashing, etc.
Offset
Elbow
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 ).
Figure 35
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
11
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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
12
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FTF13 OFFSET ELEVATION CHART
A2
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)
C2
B2
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
A1
1111
B1
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
2946
3080
3169
3245
3302
3435
3524
3696
3747
3829
4051
C1
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
61 ³⁄₄
64 ³⁄₄
67
65
68 ¹⁄₄
71 ³⁄₄
73 ¹⁄₄
75
A2
972
997
77
C2
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
1568
1645
1702
1753
1778
1854
1905
2007
2038
2083
2210
B2
A1
B1
C1
103
104 ¹⁄₂
106 ¹⁄₂
111 ³⁄₄
116
121 ¹⁄₄
124 ³⁄₄
127 ³⁄₄
130
69
70
73
75
79
80 ¹⁄₄
82
135 ¹⁄₄
138 ³⁄₄
145 ¹⁄₂
147 ¹⁄₂
150 ³⁄₄
159 ¹⁄₂
Figure 36
87
Joints
Measure height to the ceiling from the top of
fireplace-dimension “B.” Use the appropriate
Offset Elevation Chart to find dimension “A.”
Mark point where you will drive your nail to
showthecenterpointforyouroffsetceilingcut.
INSTALLING OFFSETS
Chimney
Section
4'
First, review the Offset Elevation Chart and see
Figure 39 for reference.
y Joint Past 6'
Screws Required At
Ever
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.
No. 8 x 1/2" SMS
Step2.ProceedbyusingtheStraightUpInstal-
lation Instructions for cutting and framing ceil-
ing and roof openings.
6'
No Screws Required In
Joints For First 6' of Offset
Figure 37
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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AIR INLET
EYEBROW
ASSEMBLY
Step3. Centerouter-lockingsectionoverouter
chimney pipe. Push down until locking joint
has firmly engaged.
Step 4. Pull up slightly on return elbow to
ensure locking joint has firmly engaged.
Step 5. Secure support straps to framing
members by nailing under tension in sheer
(Figure 40 ).
Underside Of Chimney
Figure 38
FOAK
FTF13-E30 Return Elbow*
Chimney Section (S)
Return
Elbow
Figure 41
Step 3. The air inlet for the outside air kit is
located on the right hand side of the fireplace
(Figure 42 ). Refer to the installation instruc-
tions packed with each FOAK-4 air kit for
specific installation information. The outside
air kit, if used, must be installed before the
fireplace is totally framed and enclosed within
the finished walls.
B
FTF13-30 Offset Elbow*
Figure 40
A
Note: The return elbow assembly performs
the same function as a stabilizer. Consider this
when determining the need for a stabilizer.
Note: Do not apply excessive pressure to any
subsequent chimney section following return
elbow assembly when installing. Ensure that
each subsequent chimney section is securely
attached by testing as noted above.
OPEN
Combustion Air Kits
*Part of Offset/Return Package Model FTF13-ES30
Figure 39
The installation of an outside combustion air
kit is highly recommended. It is very impor-
tant to ensure good fireplace operation in
homes which are tightly weather sealed or
have ventilating appliances installed.
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.
CLOSED
Step 1. Determine the source for outside air,
which can be installed through an outside wall
or into a ventilated crawl space. In either case,
a 4 1/2" diameter hole will be required for
installation of the air inlet assembly.
Offset Elbow Assembly
Figure 42
After completing the installation of the optional
combustion air vent system, the actuator arm
must be put in service and tested to ensure
proper operation before completing any enclo-
sure around the firebox. Failure to do so may
result in extensive and costly rework.
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 lock OVER the
preceding outer section of chimney. Again,
check outer section by pulling up slightly to
ensure proper connection is made.
CAUTION: AVOID INSTALLING THE AIR IN-
LET WHERE THE OPENING COULD BE
BLOCKED BY SNOW, BUSHES OR OTHER
OBSTACLES. THE MAXIMUM HEIGHT FOR
THE OUTSIDE AIR IS 50 FEET ABOVE THE
HEARTH, PROVING THE AIR INLET IS TERMI-
NATED A MINIMUM OF THREE (3) FEET BE-
LOW THE CHIMNEY CAP LEVEL.
To operate, locate the hand operated shut-off
lever at the lower right side of the fireplace
opening behind the screen. To open the air
damper, turn upwards. To close, turn down.
Return Elbow Assembly
Return elbows install the same way as round
terminations and stabilizers:
Note: Combustion air inlet ducts must not
terminate in attic space.
Operate the actuator through several cycles.
Ensuring proper operation and freedom of
movement. Return the actuator arm to the
closed position.
Step 1. Hold return elbow over top of last
chimney section.
Step 2. Install the air inlet eyebrow (FOAK-4 or
FOAK-4LD) through the wall opening (Figure 41).
Push a 4 inch diameter NON-COMBUSTIBLE
Class 0 or Class I flexible duct onto the eyebrow.
Step 2. Center inner slip section into inner flue
pipe-slip down.
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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Surrounding materials must be caulked where
it meets the black metal facing of the fireplace
to avoid cold air intrusion. Use noncombus-
tible caulking 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 on top of fire-
place or against chimney sections.
CAUTION: WHEN USING THE DECORATIVE
GAS APPLIANCE, THE FIREPLACE DAMPER
MUST BE SET IN THE FULLY OPEN POSITION.
OPTIONAL EQUIPMENT
CONSIDERATIONS
Gas Line Connection
CAUTION:PLUMBINGCONNECTIONSSHOULD
ONLY BE PERFORMED BY A QUALIFIED, LI-
CENSEDPLUMBER.MAINGASSUPPLYMUST
BE OFF WHEN PLUMBING GAS LINE TO FIRE-
PLACE OR PERFORMING SERVICE.
The EST-48 has been listed to accept a ¹⁄₂" gas
line for an approved gas appliance. Always
have the appliance installed in accordance with
all local building codes.
Note: A 2" air space must be preserved for all
combustible materials extending for any con-
tinuous length adjacent to the chimney.
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 the indentation located at the bottom and
slightly off center in the side refractories. THE
KNOCKOUT IS ALWAYS REMOVED FROM IN-
SIDE THE FIREPLACE. DO NOT REMOVE THE
KNOCKOUT UNLESS YOU ARE INSTALLING A
GAS LINE. If removal is attempted from the
outer wrapper, side refractory damage may
occur. With a medium-sized hammer, lightly
tap the surface of the indentation. The refrac-
torymaterialisverythininthisareaandiseasily
removed. Once a small hole has been made,
continue tapping until you have reached suffi-
cientdiameterforthegaslinetofitthrough.The
entire knockout does not have to be removed.
Remove insulation in the gas line channel.
CAUTION: ALL GAS CONNECTIONS SHOULD
ONLY BE PERFORMED BY A QUALIFIED, LI-
CENSED TRADESMAN. THE MAIN GAS SUP-
PLY MUST BE OFF WHEN PLUMBING THE
GAS LINE TO THE FIREPLACE OR WHEN PER-
FORMING SERVICE WORK.
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.
Install a ¹⁄₂" gas supply line through fireplace
wall for connection to a decorative gas appli-
anceinsidethefirebox. Outside, thegassupply
line connects to a gas shut-off valve recessed
flush into the wall or floor. The valve should be
controlled by a removable valve key for safety.
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 fire-
place with 2 x 4’s (or heavier) lumber.
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.
IMPORTANT:REPACKINSULATIONMATERIAL
IN SQUARE HOLE AROUND GAS LINE, INTE-
RIORANDEXTERIOROFFIREPLACE,TOSEAL.
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.
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.
These fireplaces may sit directly on a combus-
tible surface. A 2" air space is required be-
tween combustible framing and the chimney.
Combustible mantels and trim may be in-
stalled 12" above the fireplace opening as per
NFPA 211, Section 7-2.3.3. and Figure 43. If
a mantel is of a noncombustible material, it is
exempt from these requirements as long as it
does not interfere with the installation or op-
eration of glass doors.
Glass Doors
If glass doors are to be installed on these
fireplaces, refertospecificinstallationinstruc-
tionspackedwiththeglassdoors. Useonlythe
doors that are listed for use with these fire-
places. Use of other non-listed glass door on
these fireplaces may constitute a potential fire
hazard and is not recommended.
Vent Free Appliances
CAUTION: CERTAIN GLASS DOORS OVER-
LAPTHEBLACKMETALFACINGOFTHEFIRE-
PLACE. IF THE FIREPLACE HAS BEEN FACED
WITH NONCOMBUSTIBLE MATERIALS,
THERE MIGHT NOT BE SUFFICIENT CLEAR-
ANCE TO INSTALL THE GLASS DOORS OF
YOUR CHOICE. ENSURE ADEQUATE CLEAR-
ANCE IS MAINTAINED AT ALL TIMES SO AS
NOT TO INTERFERE WITH THE INSTALLA-
TION AND OPERATION OF GLASS DOORS.
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.
Finished
Wall
Combustible
Mantel and Trim
Header
Noncombustible
The unit has been tested for use with any
unvented gas log sets having a maximum
rating of 40,000 BTU. The minimum mantle
configurations are outlined in Figure 43.
12" Max.
Wall Covering
Spacer
1 ¹⁄₂"
12"
Min.
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.
8 ⁹⁄₁₆"
COLD CLIMATE INSULATION
Fireplace
Opening
If you live in a cold climate, it is especially
important to seal all cracks around the fire-
place opening with noncombustible material
and wherever cold air could enter the room.
Typical Installation
NEVER INSTALL AN UNVENTED GAS LOG
SET WITH A BTU GREATER THAN 40,000.
Figure 43
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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Alternative Hearth Extension
and Wall Shield Materials
Hearth Extension Dimensions
(For Figures 44 and 45 )
Hearth Extensions and Wall Shields
A hearth extension must be installed with all
fireplaces. It is to protect the floor in front of the
fireplacefrombothradiantheatandsparks. For
Model EST-48, the hearth extension must ex-
tend 12" beyond both sides and must extend
20" beyond the front. Use a durable noncom-
bustible material having an equal or greater
insulating value of k = .84 BTU IN/FT2 HR °F
or a thermal resistance that equals or exceed
r = 1.19 HR °F FT2/BTU IN. A minimum 1" thick
noncombustible material is all that is required
over a noncombustible slab floor.
Listed
Values
Min. Thick
A
B
C
D
20"
48"
12"
72"
Material
k
r
TL
Millboard
.84
1.19
1"
Alternative
Materials
Values
Min. Thick
TM
k
r
MethodsofDeterminingHearthExtension
Equivalents
Wonderboard
Common brick
1.92 0.56
5.00 0.20
2 ³⁄₈"
6"
To determine the thickness required for any
desired material when either the k or r values
are known:
Cement mortar 5.00 0.20
6"
Note: Any noncombustible material whose 1" k
value is less than .84 or whose r value is more
than 1.19 is acceptable.
Ceramic tile
Marble
12.5 0.08
11.0 0.09
0.43 2.33
15"
13"
¹⁄₂"
TM = thickness of desired material in inches
kM = k value of desired material
rM = r value of desired material
Micore CV230
(U.S. Gypsum)
If the fireplace is installed on a combustible
floor,themetalsafetystrips(provided)mustbe
used on the floor extending half under the
fireplace and half under the hearth extension.
T1 = minimum listed thickness
Ceraform 126
(Johns-Manville)
0.27 3.70
¹⁄₂"
Example: Micore CV230 is to be used with the
EST-48 fireplace. How thick must this material
be?
Secure the hearth extension to the floor to
prevent possible shifting.
At times, it is important to know what combina-
tions of materials are acceptable for use as
hearth extension. The “R” values are used to
determine acceptable combinations of materi-
als because “R” values are additive where r and
k values are not.
Using the k formula:
If the fireplace is installed diagonally across a
90° corner, the 24" sidewall clearance can be
reduced to 20" and no wall protection is re-
quired.
Desired
k value of desired
Required = material (per inch) x of listed
Thickness k value of listed
material (per inch)
Min.Thickness
material
“R” value = 1 = r x thickness of material
k
Side Wall cannot be
Closer than 24" under
any Circumastances
TM (inches) = kM x T1
.84
Example: Given that the required “R” value for
asuitablehearthextensionusedwiththeEST-48
must be equal to or greater than “R” = r x T1 =
1.19 x 1" = 1.19. It is desired to elevate a marble
hearth extension to a level of 5” or more off the
floor surface. What combination of noncom-
bustible materials can be used to accomplish
this?
TM (inches) = 0.43* x 1" **
.84
Answer using k = 0.51 x 1 = 0.51 = ¹⁄₂"
C
Using the r formula:
B
A
C
Desired
k value of desired
Min.Thickness
If common brick is used so that the 3 ¹⁄₂"
dimension is the height, then “R” for the com-
mon brick becomes:
Required = material (per inch) x of listed
Thickness k value of listed
material (per inch)
Figure 44
material
“R”M = r x TM = 0.20 x 3 ¹⁄₂" = 0.70
TM (inches) = 1.19 x T1
rM
Using ¹⁄₂" of mortar to set the brick, then “R” for
the mortar becomes:
TM (inches) = 1.19 x 1" **
2.33*
“R” = r x TM = 0.20 x ¹⁄₂" = 0.10
Answer using r = 0.51 x 1" = 0.51 = ¹⁄₂"
A ³⁄₄" marble slab set on ¹⁄₄" micore covers the
brick, then “R” for the marble and micore
becomes:
C
C
B
D
A
* value taken from chart
** minimum thickness per listing
“R” = r x TM = 0.09 x ³⁄₄" = 0.068
“R” = r x TM = 2.33 x ¹⁄₄" = 0.5825
Figure 45
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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The sum of all “R” values is:
Combustible materials may project beyond the
sides of the fireplace opening as long as they
are kept within the shaded areas illustrated in
Figure 47.
.70 + .10 + .068 + .5825 = 1.4505
This would be an acceptable combination of
materials for the hearth extension since the
total calculated “R” value of all material used
exceed the required “R” value of 1.19.
Combustible
Fireplace
Materials Allowed
in Shaded Areas
3 ¹⁄₄"
Firestop Spacer (30°)
63L37
F10FS30-2
WARNING: THE CRACK BETWEEN THE
FIREPLACE AND THE HEARTH EXTEN-
SION MUST BE SEALED WITH A NON-
COMBUSTIBLE MATERIAL.
¹⁄₂"
15°
4 ³⁄₄"
12" Min.
Distance to
Protected Side Wall
WARNING: THE FIREPLACE MUST BE
RAISED IF THE HEIGHT OF THE HEARTH
EXTENSION EXCEEDS 8 ¹⁄₂" ABOVE THE
BOTTOM OF THE FIREPLACE (FIGURE
46 ).
18" Min.
Distance to
Unprotected Side Wall
Figure 47
Offset/ Return
INSTALLATION COMPONENTS
Package (30°)
63L24
FTF13-ES30
The following items are available for use in the
installation of this appliance.
8 ¹⁄₂" Max.
Chase Termination
(Square)
Maximum Thickness of Hearth Extension
when EST-48 is on the Floor
63L54
FTF13-CT2
Figure 46
FINISH TO YOUR TASTE
Outside Combustion Air Kits
(with duct)
81L87
81L88
FOAK
FOAK-LD
(without duct)
There are a wide variety of “finished looks” for
these fireplaces, from formal wall decor with
elaborate mantels to rustic wood paneling or
warm brick facings.
Stabilizer
63L27
FTF13-S4
Only noncombustible materials like stone, tile,
brick, etc., may overlap the black front facing.
Do not extend these materials beyond the black
facing and into the firebox area. Be sure not to
interfere with the installation and operation of
glass doors or block the upper or lower grilles.
Seal all joints between the black facing and wall
surrounds to prevent air intrusion. Use non-
combustible caulking material only to seal the
black metal facing to the surround material on
the finished wall.
Combination
Offset/Return Elbow
63L35
FTF13-OR15
Locking Band
63L60
FLB
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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INSTALLATION COMPONENTS
63L40
63L41
F10F6
F10F12
Round Termination
63L44
FTF13-CTD
Flashing
Firestop Spacer (Flat)
63L36
F10FS-2
Chase Termination
(Square)
63L50
FTF13-CT1
63L19
63L20
63L21
FTF13-12
FTF13-18
FTF13-36
Storm Collar
63L59
FSC
Chimney Section
NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
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LennoxHearthProductsreservestherighttomakechangesatanytime,withoutnotice,indesign,
materials, specifications, prices and also to discontinue colors, styles and products.
Consult your local distributor for fireplace code information.
1110 West Taft Avenue
Orange, CA 92865
Printed in U.S.A. © 2001 by LENNOX HEARTH PRODUCTS
P/N 850,006M REV. D 05/2005
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