Lennox Hearth Products Merit CST-38 User manual

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 1
36" Wood Burning Fireplaces
P/N 850,049M REV. N/C 01/2007
CST-38 CPF-38
MODELS
This installation manual will enable you to obtain a safe, efficient and
dependableinstallationofyourfireplacesystem.Pleasereadandunder-
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,mayvoidthewarranty,listingsandapprovalsofthissystem
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.
INSTALLATION
INSTRUCTIONS
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE
OTL Report No. 116-F-20-4
MERIT®SERIES

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2
IMPORTANT: PLEASE READ AND
UNDERSTAND THESE RULES TO
FOLLOW FOR SAFETY.
1. Before starting your fireplace installation,
read these installation instructions carefully to
besureyouunderstandthemcompletelyandin
entirety. Failure to follow them could cause a
fireplacemalfunctionresultinginseriousinjury
and/or property damage.
The manufacturer is not responsible for any
smoking or related problems that may result
fromthe lackof adequatecombustionair.Itis
the responsibility of the builder/contractor to
ensurethatadequatecombustionairhasbeen
provided for the fireplace.
13. DO NOT use a fireplace insert or any other
productsnotspecifiedhereinbythemanufacturer
forusewiththisfireplace.Allgaslogsetsmustbe
operated with the damper clamped open.
2.Alwayscheckyourlocalbuildingcodes.The
installation must comply with all local, re-
gional, state and national codes and regula-
tions.
3. These fireplaces must be installed with
Security Chimneys FTF8 (8" inside diameter)
Chimney System only. These systems are in-
tended for use in any application where a
traditional masonry type fireplace would ap-
ply. The chimney system must always vent to
the outside of the building.
4. To ensure a safe fireplace system and to
prevent the build-up of soot and creosote,
inspect and clean the fireplace and chimney
priortouseandperiodicallyduringtheheating
season.
5. Use solid fuel only. DO NOT use artificial
waxbasedlogs,chemicalchimneycleanersor
flame colorants in your fireplace.
6. DO NOT use charcoal or coal under any
circumstances.
7. NEVER use gasoline, gasoline-type lantern
fuel,kerosene,charcoallighterfluid,orsimilar
liquids to start or “freshen up” a fire in this
fireplace. Keep any flammable liquids a safe
distance from the fireplace.
8. NEVER leave children unattended when
there is a fire burning in the fireplace.
9.Alwayskeepfluedamperopenwhenheatis
present in the fireplace.
10. Before servicing, allow the fireplace to
cool. Always shut off any electricity or gas to
the fireplace while working on it. This will
preventanypossibleelectricalshockorburns.
11. This fireplace is not intended to heat an
entire home or be used as a primary heat
source. It is designed to ensure homeowner
comfort by providing supplemental heat to the
room.
12. Always ensure an that adequate supply of
replacement combustion air from the outside
ofthehouseisaccessibletothefiretosupport
normalcombustion.Fireplacesconsumelarge
volumes of air during the normal combustion
process.Intheeventthehomeistightlysealed
withmodernenergy efficientfeatures,the op-
tional combustion air kit may not provide all
the air required to support combustion.
TABLE OF CONTENTS
Safety Rules .................................... page 2
Tools and Building Supplies ............ page 2
Precautions ..................................... page 3
Introduction..................................... page 3
Chimney/Mantel Clearances And
Height Requirements....................... page 3
Chimney System ............................. page 4
Assembly Outline............................. page 4
Location of Fireplace ....................... page 4
Assembly Steps............................... page 5
Preinstallation Notes........................ page 5
Fireplace Clearances ........................ page 5
Installing the Fireplace..................... page 5
Fireplace Specifications .................. page 7
Framing Specifications.................... page 8
Framing Wall Variations.................. page 9
Installing the Chimney System ........ page 10
Ten Foot Rule Summary .................. page 13
Multiple Terminations...................... page 13
Chimney Component Calculations ... page 13
Special Offset Instructions............... page 13
Vertical Elevation Chart................... page 14
Offset Elevation Chart ..................... page 15
Offset Calculations........................... page 16
Installing Offsets.............................. page 16
30°Offset through Floor/Ceiling ...... page 16
Glass Doors..................................... page 17
Optional Equipment Considerations. page 17
Combustion Air Kits ........................ page 17
Gas Line Connection........................ page 17
Cold Climate Insulation.................... page 18
Fireplace Finishes ............................ page 18
Mantels and Trim............................. page 18
Hearth Extensions/Wall Shields ....... page 18
Finish Requirements........................ page 20
Accessories And Components ......... page 21
14. "Smoke free” operation is not warranteed
norareweresponsibleforinadequate system
draft caused by mechanical systems, general
construction conditions, inadequate chimney
heights, adverse wind conditions and/or un-
usualenvironmentalfactors or conditionsbe-
yond our control.
15. Never, under any circumstances, install a
fireplace, chimney component or any acces-
sories, that has visible or suspected physical
damage as a result of handling or transporta-
tion.Theseitemsshouldbeinspectedbyyour
distributor or qualified factory representative
toensuresafe condition. Whenindoubt, con-
sult your distributor.
16.Foradditionalsafetyconsiderationsandcom-
pleteoperatinginstructions,refertotheCareand
Operation Manual provided with the fireplace.
TOOLS AND BUILDING SUPPLIES
NORMALLY REQUIRED
Tools should Include:
Phillips screwdriver
Hammer
Saw and/or sabersaw
Level
Measuring tape
Plumb line
Electric drill and bits
Pliers
Square
Building supplies:
Framing materials
Wall finishing materials
Caulking materials (non-combustible)
Fireplace surround and hearth
extensionmaterials(non-combustible)
WARNING: THIS FIREPLACE HAS NOT
BEEN TESTED WITH AN UNVENTED GAS
LOG SET. TO REDUCE RISK OF FIRE OR
INJURY,DONOTINSTALLANUNVENTED
GAS LOG SET INTO THIS FIREPLACE.

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Figure 1
TYPICAL INSTALLATION
*Construction Materials:
• framing materials • paneling
• particle board • flooring
• dry wall • etc.
• plywood
PRECAUTIONS
Note: These fireplace systems are not difficult
toinstall.However,intheinterestofsafety,itis
recommendedthattheinstallerbeaqualifiedor
certified “tradesman” familiar with commonly
accepted fireplace installation and safety tech-
niques as well as prevailing local codes.
The most important areas of concern dealing
withtheinstallationoffactory-builtfireplacesare
clearancestocombustiblematerials,properas-
semblyofcomponentparts,heightofthechim-
ney system, the proper use of accessories sup-
plied by the manufacturer and the techniques
employedinusingfinishingmaterialsappliedto
thewallsurroundingthefireplace,hearthexten-
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.
INTRODUCTION
General Information
The CST-38 and CPF-38 Series are radiant-
heat,two-sidedandthree-sidedfireplaceswith
required glass doors, that must be ordered
separately. A steel grate is included with the
CST-38 and CPF-38 to properly position the
fire. An outside combustion air kit is available
as optional equipment.
Note:Illustrationsshownreflect“typical”instal-
lations with nominal dimensions and are for
designandframingreferenceonly.Actualinstal-
lationsmayvaryduetoindividualdesignprefer-
ences.However,alwaysmaintainminimumclear-
ances to combustible materials and do not vio-
late any specific installation requirements.
Thesefireplaceshavebeentestedandlistedby
Omni Test Labs (Report No. 116-F-20-4) to
U.L. standard 127 and U.L.C. S610 for Cana-
dian installations. These units are intended for
installationinresidentialhomesandotherbuild-
ings of conventional construction including
commercial, not in mobile homes.
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 CST and CPF systems consists of four
“subsystems”:
1. The Fireplace and Door Assemblies
2. The Chimney and Termination
3. The Optional Combustion Air Kit
4. The Chimney Air Kit (Canada Only)
CLEARANCES AND HEIGHT
REQUIREMENTS
Thefireplacemaybeplacedonornearnormal
construction materials*. The combustion air
kit,firestopspacerandroofflashing(notchase
flashings)maybeplaceddirectlyonoragainst
normalconstructionmaterials.*(Thechimney
and fireplace outer wrapper require a mini-
mum 2" and 1/2" air space to combustibles
respectively). A combustible mantle may be
installed12"abovetheopeningofthefireplace
as per NFPA 211, Section 7-2.3.3.
The CPF-38 fireplace opening must be kept a
minimumof8"(203mm)fromanunprotected
combustible side wall. The CST-38 fireplace
opening must be kept a minimum of 8"
(203 mm) from a protected combustible side
wall. A perpendicular side wall can not be
closer that 8" (203 mm) for both the CPF-38
and CST-38 fireplaces (
see Figure 60 and
Figure 61 ). If there is a continuous perpen-
dicular side wall closer than 18" from
the CST-38 fireplace opening, it must be pro-
tected with a 40" x 40" (1016 mm x
1016 mm ) wall shield constructed of mill-
board or a durable noncombustible material
with an equal or greater insulating value than
k=.84 BTU IN/FT2HR °F (refer to page 18).
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.
The fireplace and chimney system must be
enclosedwheninstalledinorpassingthrough
a living area where combustibles or people
maycomeincontactwithit. This is important
to prevent possible personal injury or fire
hazard.
Model CST-38
Model CPF-38
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.

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4
For questions, please call your distributor or
the manufacturer. Special restrictions apply to
thefrontand facingofthe fireplace andnearby
walls (See pages 18, 19 and 20 ).
CHIMNEY SYSTEM
These fireplaces are designed and listed for
use with Security Chimneys FTF8 chimney
System only. Always use Security Chimneys
FTF8 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.
Figure 2
Note: Do not insulate the chase cavity with
blown or fill type insulation materials.
Note:Localcodesmaynotrequirefirestopping
at the ceiling levels for outside chase installa-
tions. However, it is recommended for safety
and the reduction of heat loss.
Chimney Height
Thetotalheight ofyourCSTand CPFfireplace
systems from the surface the fireplace rests
on to the chimney top must not exceed 80'
(24.4m)andmustalsomeetminimumsystem
height chart.
Minimum System Height
Model CST-38 Security's
and CPF-38 FTF8
Vertical Installation 15' 0" (4.6 m)
One Offset 16' 0" (4.9 m)
Two Offsets 25' 0" (7.6 m)
Chase Enclosure
A chase is a vertical box-like structure con-
structedtosurroundthefireplaceandchimney.
Referto Figure2 foratypicalchaseconfigura-
tion. A chase should be constructed and insu-
latedjustlikeanyoutsidewall.Inacoldclimate,
we recommend the base of the chase should
alsobeinsulatedbetweenthesolidcontinuous
floor beneath the fireplace and the chase bot-
tom.Chaseinsulationinacoldclimateinstalla-
tion is not required for safety.
ASSEMBLY OUTLINE
Before You Start
Checkyourinventorylisttobesureyouhaveall
the necessary parts supplied in good usable
condition.Checkalsoforanyconcealeddamage.
Checktheoperationofthedamper.Thedamper
iscontrolledthroughtheuseofacontrollever
located within the firebox opening at the top
centerjustbehindthefireboxlintel( Figure3 ).
The control lever snaps into place at the ex-
tremerangeofmotion,upintheopenposition.
When pulled down, the damper is closed.
Figure 3
Damper
Open Damper
Closed
Lintel
LOCATION OF FIREPLACE
Carefully select the proper location for heat
circulation, aesthetics, chimney obstructions
andclearancetosidewall(s).Withproperpre-
planning, a slight adjustment of a few inches
can save considerable time and expense later
during construction and assembly.
Figure 4
Insulate Joists
Same As Ceiling
Draft Stops
Firestop
CTDT
Termination
Note: Non-
Combustible
Chase
Flashing
Must Be
Used To
Cover
Chase
Opening
Optional
Insulation
In Outside
Walls Of
Chase
Solid
Continuous
Surface
Outside
Base
Insulation
(Thermal Barrier)
8'
Level
WARNING:IFINSULATIONISUSED,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.
WARNING: DO NOT PACK OR FILL RE-
QUIRED AIR SPACES WITH INSULATION
OR OTHER MATERIAL. NO MATERIAL IS
ALLOWED IN THESE AREAS.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 5
Figure 7
Figure 6
Carefullyconsiderthepositionofthefireplace
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.
This system is intended to be installed in resi-
dential homes and buildings of conventional
construction, not in mobile homes.
Whenlocatingthefireplace,considerationmust
be given to combustibles and final finishing.
For an example of this, see Figure 5 and
confinethefinallocationofcombustiblefinish
materials to the "Safe Zone".
DO NOT permanently place furniture or other
items such as decorative pillows within 60" of
the fireplace front face.
Figure 5
ASSEMBLY STEPS
Note:Thefollowingstepsrepresentthenormal
sequence of installation. Each installation is
unique,however, and might require a different
sequence.
1. Position firebox prior to framing or into
prepared framing.
2. Install the chimney air kit (Canada only)
3. Install the chimney system.
4. Install optional outside combustion air kit.
5. Plumb gas line if a decorative gas appliance
will be used. (Gas connections should only be
performed by an experienced, licensed/certi-
fied tradesman).
6. Install both “All-GlassTM” door assemblies.
7. Completefinishwallmaterial, surround and
hearth extension to your individual taste.
Study the three dimensional illustration (
Fig-
ure1 )to getageneralideaof eachelementof
your fireplace system.
PRE-INSTALLATION NOTES
The fireplace may be installed directly on a
combustiblefloororraisedonaplatformofan
appropriate height. Do not place fireplace on
carpeting,vinylorothersoftfloorcoverings.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.
The fireplace may be positioned and then the
framingbuiltaroundit,or the framing may be
constructed and the fireplace positioned into
the opening.
Usually,nospecialfloorsupport isneededfor
the fireplace, however, to be certain:
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.
2. Measure the square footage of the floor
spacetobeoccupiedbythesystem,surrounds
and hearth extensions.
3.Notethefloorconstruction,i.e.2x6’s,2x8’s
or 2 x 10’s, single or double joists, type and
thickness of floor boards.
4. Use this information and consult your local
building code to determine if you need addi-
tional support.
CAUTION: DO NOT BLOCK THE HEAT-CIRCU-
LATING AIR INLET AND OUTLET PORTS ON
CIRCULATINGMODELS. DOINGSO MAY RE-
SULT IN A POTENTIAL FIRE HAZARD.
If you plan to raise the fireplace and hearth
extension, build the platform assembly then
positionfireplaceandhearth extension on top.
Secure the platform to the floor to prevent
possible shifting.
CLEARANCES
Minimum clearance to combustibles for the
appliance is as follows: sides and back - 1/2"
(25mm),floor-0"(0mm),adjacentwall-See
the Table in Figure 5 , ceiling - 37 ¹⁄₂" (953
mm).
INSTALLING THE FIREPLACE
Step 1. Slide the fireplace into prepared fram-
ingorpositionfireplaceinitsfinalposition and
frame later.
Thefireplace maynot berecessed intoacom-
bustible floor. Maintain the floor to hearth
clearance established by the fireplace lower
front face.
Step 2. Inserttheprovided metalsafetystrips,
beneaththefireplaceasillustrated( Figures6,7
and8 ).Thesafetystripsshouldoverlap¹⁄₂"for
continual coverage of the floor.
Note: Safety strips are not required when fire-
place rests on a noncombustible surface.
Note:Installthehearthextension only as illus-
trated.
Hearth
Extension
Floor
Hearth
Extension Metal Safety
Strips
Floor
Hearth
Extension
Floor
Hearth
Extension Metal Safety
Strips
Platform
Wall
Covering
Black Portion Of Frame
Not To Be Covered With
Combustible Materials
Safe
Zone
B
A
C
Door
Opening
1”
CPF-38 CST-38
A 5-5/8" 11-3/8"
B30°30°
C 8" 18"

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
6
The safety strips should extend in front and
sides of the fireplace opening 2" (51 mm) . In
theevent 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
asthefloorbeneaththehearthextension(
see
Figures 8, 9, 10, and 11 ). The safety strips
should be tacked down to prevent possible
movement.
Note: The “Z” type safety strip is not supplied.
Step3. Refertofireplacedrawingsandspeci-
ficationsonpages7 and 8 for framingdimen-
sions and details. False header may be posi-
tioned directly on top of the fireplace spacers
( see Figures 12, 13 and 14 ).
Figure 9
Figure 8
Metal
Safety Strips
2" Min.
(51 mm)
Platform
Metal
Safety Strips
* 2" Min.
(51 mm)
*
*
Figure 11
Figure 10
*
* 2" Min. (51 mm)
*
*
Special “Z”
Metal Safety Strips
*2" Min.
(51 mm) *
*
*
Figure 12
4 x 6 Header
Spacer
2 x 4 False
Header
Figure 14
Figure 13
IMPORTANT: UNDER NO CIRCUMSTANCES
CAN THE FIREPLACE TOP SPACERS ( FIGURE
12 ) BE REMOVED OR MODIFIED, NOR MAY
YOUNOTCHTHEHEADERTOFITAROUNDOR
BE INSTALLED LOWER THAN THE SPACERS.
THE HEADER MAY BE IN DIRECT CONTACT
WITH THE TOP SPACERS BUT MAY NOT BE
SUPPORTED BY THEM.
If the appliance is to be elevated above floor
level, a solid continuous platform must be
constructed.
Theheadermayrestonthetopmetalspacers,
but must not be notched to fit around them.
Consult all local codes.
Free Air Space. Do Not Place
Any Type Of Combustible Or
Non-Combustible Materials In
Shadded Areas.
Free Air Space. Do Not Place
Any Type Of Combustible Or
Non-Combustible Materials In
Shadded Areas.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 7
FIREPLACE SPECIFICATIONS
Figure 15
39 ¹⁄₄"
(997 mm)
23 ¹⁵⁄₁₆"
(608 mm)
25 ³⁄₁₆"
(640 mm)
8"
(203 mm)
Left Front View
Model CPF-38
Front View
Model CST-38
Top View
End View
12 ¹⁄₂"
(318 mm)
48 ³⁄₄"
(1238 mm)
8 ⁹⁄₁₆"
(217 mm)
3 ⁷⁄₈"
(98 mm)
42 ¹⁄₂"
(1080 mm)
8 ¹³⁄₁₆"
(224 mm)
Combustion Air
12 ¹⁄₂"
(318 mm)
48 ³⁄₄"
(1238 mm)
10 ¹⁄₂"
(267 mm)
5 ³⁄₄"
(146 mm)
21"
(533 mm)
5 ¹⁄₄"
(133 mm)
32"
(813 mm)
39 ¹⁄₄" (997 mm)
38" (965 mm)
12 ¹⁄₂"
(318 mm)
48 ³⁄₄"
(1238 mm)
10 ¹⁄₂"
(267 mm)
5 ³⁄₄"
(146 mm)
21"
(533 mm)
5 ¹⁄₄"
(133 mm)
32"
(813 mm)
39 ¹⁄₄" (997 mm)
38" (965 mm)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
8
Figure 16 Figure 19
CPF CST
Figure 17
Figure 18 Figure 21
CST - Front View
CST - End View
CPF - Right Front View
CPF - End View
FRAMING SPECIFICATIONS
Figure 20
7" Min.
(178 mm)
*24 ³⁄₁₆"
(614 mm)
Maximum
49"
(1245 mm)
4 x 4 Header
2 x 4
False Header
(Optional)
*39 ¹⁄₄"
(997 mm)
Maximum
42 ³⁄₄"
(1086 mm)
*Dimensions Calculated For 1/2” Drywall
42 ³⁄₄"
(1086 mm)
7" Min.
(178 mm)
42 ³⁄₄"
(1086 mm)
49"
(1245 mm)
40 ¹⁄₄"
(1022 mm)
4 x 4
Header
2 x 4
False Header
(Optional)
*24 ³⁄₁₆"
(614 mm)
Maximum
*Dimensions Calculated
For 1/2” Drywall
42 ³⁄₄"
(1086 mm)
49"
(1245 mm)
49"
(1245 mm)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 9
Figure 22
FRAMING WALL VARIATIONS
As many as six (6) different framed wall con-
figurations can be constructed to enclose the
CST and CPF fireplaces. The following illustra-
tionsdepictthesevariationsofwallenclosures.
Severalofthesedesignsmayincorporatebook
shelves, wood storage boxes, etc.
Figure 23
Figure 24
Framing Dimensions for Ceiling
Ceiling Opening
Flue Type A B
FTF8, Vertical 16 ¹⁄₂" 16 ¹⁄₂"
at 2" (51 mm) (419 mm) (419 mm)
FTF8, Offset 16 ¹⁄₂" 27"
At 2" (51 mm) (419 mm) (686 mm)
Figure 25
Framing Dimensions for Roof
FTF8 at 2" (51 mm)
Pitch C D*
0/12 16 ¹⁄₂" 16 ¹⁄₂"
(419 mm) (419 mm)
6/12 16 ¹⁄₂" 19"
(419 mm) (483 mm)
12/12 16 ¹⁄₂" 23 ¹⁄₂"
(419 mm) (597 mm)
CST - Wall Types
CPF - Wall Types
* Perpendicular to Roof Ridge.
“C” Type Wall
“T” Type Wall
“L” Type Wall
“H” Type Wall
“Y” Type Wall
Parallel Wall
Parallel Wall
“Y” Type Wall
“L” Type Wall
“T” Type Wall
“C” Type Wall
“H” Type Wall
A
B
Ceiling Framing
C
D
Roof Framing

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
10
A minimum 2" (51 mm) air space must be
reservedforallcombustiblematerialsextend-
ingforanycontinuouslengthsurroundingthe
chimney.
Reference
Figures24and25 andcharts“Fram-
ingDimensions forCeilingandRoof” onpage
8, which specify minimum ceiling and roof
dimensions.
For new construction, to determine chimney
centerline,useplumblinefromrooforceiling
above fireplace to center of flue collar on
fireplace.
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 28 ). Then plumb from ceiling or
roof level directly above hole which has just
been completed.
Step4.Thefireplaceshouldbesecuredtoside
framing members using nailing tabs. Use 8d
nails or equivalent (
Figure 26 ).
Figure 26
Note: The nailing tabs are exempt from the
fireplace clearances described on the fireplace
clearance label.
For Canadian Installations Proceed with
Steps 5–8.
Step 5. Remove one of the knockouts from
either the left or right side of the fireplace
transition. Attach the 4" (102 mm) collar from
the FOAK-4 chimney air kit to the transition,
using the four (4) No. 8 x ¹⁄₂" screws provided
( Figure 27 ).
Step 6. Connect the 4" (102 mm) Class 0 or
Class1airducttothecollar(justmounted)with
two (2) No. 6 x ³⁄₈" screws provided in the
hardware kit.
Step7.RoutetheClass0orClass1airductout
the back or side wall, up through the ceiling or
floor joists to an outside wall. The air duct
should be located above snow level.
Note: If the fireplace is installed against an
inside wall, the Class 0 or Class 1 air duct may
beextendedintoaventilatedatticspaceatleast
18" (457 mm) above the attic floor. Secure the
duct hood to a vertical post with the inlet
positioned downward. Ensure nothing blocks
the hood opening. Do not terminate the duct
hood higher than the chimney.
Step8.Cutorframeaholethroughtheoutside
wallfortheinstallationoftheductinlethood.A
4¹⁄₂"(114mm)diameterholeissufficient.Feed
thelooseendoftheflexibleairductthroughthe
holecutfortheinlethoodandattachtocollaron
inlet hood using two (2) No. 6 x ³⁄₈" screws
provided. Insert hood into opening. Secure in
place with the No. 8 x 1 ¹⁄₂" screws provided or
withnailsdriventhroughholes in hood flange.
Seal with noncombustible waterproof silicon
type caulking. If additional air duct is needed,
use Class 0 or Class 1 metallic duct.
INSTALLING THE CHIMNEY SYSTEM
Step 1. Check flue damper for proper opera-
tion. To open, push handle up and release.
Damper will open automatically. To close, pull
handledownandreleasedamperwillfalltothe
closed position.
Note: The damper may be operated from both
firebox openings.
Step 2. Using standard construction framing
techniques,constructopeningforchimneyroute
upthroughtheceiling(s)androoforthroughan
outside chase.
Framingmustmaintainadequateminimum 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.
Nailing
Flange
Framing
Stud
Plumb Line
Figure 27
Figure 28
Step3.Positionappropriatefirestopspacerat
ceiling and nail temporarily with two (2) 8d
nails. Use flat firestop spacer, Model F8FS-2,
ifchimneypenetratesceilingvertically.Ifchim-
ney penetrates ceiling at 30°angle (offset
chimney), use Model F8FS30-2. Nailed, one
eachonoppositesidestoholdfirestopspacer
inposition.Fastenpermanently,usingatleast
two (2) more 8d nails or equivalent, after
chimney sections have been assembled
throughthefirestop spacerandafterany nec-
essaryadjustmentshave beenmade.Firestop
spacermust besecuredby atleastfour(4)8d
nails or equivalent when completely installed.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 11
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 ).
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 FTF8-
S4 stabilizer installed at 30' (9.1 m) intervals.
Note:TheModelFTF8-S4adds3"(76mm)net
effective height to the total chimney system.
Install the Model FTF8-S4 stabilizer by fitting
inner section down into respective section of
proceeding flue pipe and locking outer stabi-
lizersection intoplace overthe outerchimney
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
chimneypipedirectlyto stabilizer using same
techniquesasdescribedinStep4( Figure35 ).
Figure 35
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.
Note: If there is a room above ceiling level,
firestopspacermustbeinstalledonthebottom
side of the ceiling. If an attic is above ceiling
level, firestop spacer must be installed on top
side of ceiling joist (Figures 29 and 30).
Figure 29
Figure 30
For Canada Only
When installing the chimney system through
anopenatticspace,theatticshield assembly-
firestopspacermustbeused( Figure31 ).This
installationisWarnockHerseyInc.listedonly
for use in Canada.
Figure 31
Step4. Note:Chimneysectionsareconstructed
with a unique locking tab design which en-
sures an immediate, tight assembly between
sections. Plan your chimney requirements
carefully before assembly as chimney is diffi-
cult to disassemble after installation. If disas-
sembled,thetabsmightbecomedamaged.Be
certain tabs are properly formed to ensure
tabs engage properly.
TheFTF8chimneysystemisatwo-piecechim-
ney, which snaps together from the fireplace
up. Start with the inner flue section. With the
lanced end up, snap-lock it into the matching
collarontopofthefireplace.Atallsubsequent
joints, the upper flue section fits into the
preceding flue section. Each piece snaps to-
gether by means of locking tabs (7 locking
tabsper joint).Check eachpiecebypullingup
slightlyfromthetoptoensureproperengage-
ment before installing succeeding sections, If
thefluehas been installed correctly,itwillnot
separate when you test it. Also, the inner flue
joint where each section is joined should be
tight and flat without gaps ( Figure 32 ).
Figure 32
Outer pipe section installs in just the opposite
way; the lanced end goes down and each new
sectiongoesOVERthe outside of the previous
section installed ( Figure 33 ).
Firestop Spacer
Room Above
Firestop Spacer
Attic Above
Locking Tabs
(Lances)
Figure 33
Note: Assemble one component of chimney at a
time (inner section first, then outer section last)
beforeproceedingwiththenextcompletesection.
Continuetoassemblethechimneyupthrough
framedceilingopening. Assemblejustenough
topenetratetheroofflashingopenings( Figure
34 ). Alwaysmaintain2"(51mm)minimumair
space to combustible materials and always
check each pipe joint (inner and outer) to
ensure proper engagement.
FTF8-S4 Stabilizer
2" (51mm) Min. Air Space
to Combustibles
Figure 34
Open Attic Space

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
12
Figure 40
Step 10. Using an FTF8-CTD Round Termi-
nation:
1. Hold FTF8-CTD over top of last chimney
section (
Figure 40 ).
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.
4. Pull up slightly on CTD to ensure locking
joint has firmly engaged.
Using a FTF8-CTDT Chase Termination:
Refer to specific installation instructions in-
cluded with the FTF8-CTDT chase termination
for clearance and installation details.
Using a FTF8-CT1 Chase Termination:
Refer to specific installation instructions in-
cluded with FTF8-CT1 chase terminations for
clearance and installation details.
Using a FTF8-CT2 Chase Termination:
Refer to specific installation instructions in-
cluded with FTF8-CT2 chase terminations for
clearance and installation details.
Note: It is recommended that all exterior ex-
posedmetalfireplace components;suchaster-
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.
Step 6. Select proper Security Chimneys roof
flashingbasedonpitchofroof.Usechartbelow
for selection:
Roof Pitch FTF8
Flat to 6/12 F8-F6
6/12 to 12/12 F8-F12
Next,slideroofflashingoverextendedchimney
sectionthatpreviouslyhasbeeninstalledabove
the roof opening in Step 4. FTF8 flashings
requireflashingspacers. Slide flashlingallthe
way down until the flashing base rests flat on
the roof (
Figure 36 ). Again, check the vertical
position of the chimney and the 2" (51 mm)
minimum air space to combustibles.
Note: Do not caulk or seal the ventilating
openings.
Figure 38
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
pipejointsequallycovering thejoints ofboth
pipesections.UsenutprovidedandTIGHTEN
snugly. Do not over tighten as this might
damage chimney section (
Figure 38 ).
Note: Ifchimneyextendsmorethan8'(2.4m)
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 39 ). Guy
wires are not supplied by the manufacturer.
Figure 39
Step 7. Secure flashing by nailing along the
perimeterintoroofusing8dnailsorequivalent.
If shingled roof, slide upper end and sides of
roof flashing under shingles (trim if neces-
sary),sealthetopandbothsidesoftheflashing
tothe roofwithroof caulking.Covernail heads
with roof caulking ( Figure 37 ).
Figure 37
Step8.ThestandardSecurityChimneysFTF8
roof flashing assembly includes a storm col-
lar. Slide storm collar over outer chimney,
alignwithtopsurfaceofflashing,insertstorm
tab in slot, pull tight and bend tab back over
slot. Seal storm collar to outer chimney with
roofcaulkingormasticaroundentirecircum-
ference of pipe. Also add extra roof caulking
where storm collar meets flashing and to the
tab/slotareatosealcompletelyagainstwater
penetration( Figure38 ). Checkalljointsvery
carefully to ensure no water intrusion can
take place.
Figure 36
Waterproof
Caulk
Locking Band
Roof Ridge
120°
CTD
Termination Chimney
FTF8 Chimney
FTF8 Flashing
Do Not Seal

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 13
Figure 41
TEN FOOT RULE SUMMARY
The minimum chimney height above the roof
and/ortoadjacentwallsandbuildingsisspeci-
fied by all major building codes.
If the horizontal distance from the peak of the
roof is less then 10' (3 m), the top of the
chimney must be at least 2' (610 mm) above
the peak of the roof.
If the horizontal distance from the chimney
edge to the peak of the roof is more than 10'
(3 m), a chimney height reference point is
established on the roof surface located hori-
zontally10'(3m)fromthechimneyedge.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.
The2'in10'ruleisnecessaryintheinterestof
safety,butdoesnotensuresmoke-freeopera-
tion. Trees, buildings, adjoining roof lines,
adverse wind conditions, etc., may require a
taller chimney should the fireplace not draft
properly (
see Figure 41 ).
MULTIPLE TERMINATIONS
If more than one termination is located in the
same chase or within the same general prox-
imity,wesuggestthey 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
terminationofanothersmokeexit( Figure42 ).
Figure 42
This suggestion is provided in the interest of
betteroperation.Iftheterminationsarelocated
too close to each other, smoke may migrate
from one flue into the other.
FTF8 CHIMNEY COMPONENT
CALCULATIONS
The minimum installed height of the CST and
CPF fireplace systems (including fireplace and
chimneycomponents)is15'(4.6m).25'(7.6m)
with two offsets. The maximum system height
is 80' (24.4 m).
Todeterminethenumberofchimneysections
and chimney components required, follow
these steps:
1. Determine total vertical height of the fire-
placeinstallation.Thisdimensionismeasured
from the surface the fireplace sets on to the
pointwheresmokeexitsfromthetermination.
2. Determine the number of chimney compo-
nentsrequired,exceptchimneysections.This
would include firestop spacers, stabilizers,
roof flashing, etc.
3.Theeffectiveheightsofthecomponentsare:
CST/CPF Fireplace = 48" (1219 mm)
FTF8-12 = 10 ¹⁄₄" (260 mm)
FTF8-18 = 16 ¹⁄₄" (413 mm)
FTF8-36 = 34 ¹⁄₄" (870 mm)
FTF8-48 = 46 ¹⁄₄" (1175 mm)
CTD Termination = 4" (102 mm)
CT1 Termination = 18" (457 mm)
CT2 Termination = 15" to 23"
(381 mm – 584 mm)
CTDT Termination = 12" to 18"
(305 mm – 457 mm)
S4 Stabilizer * = 3" (76 mm)*
* Required for every 30' (9.1 m) of vertical
chimney and 10' of offset chimney.
4. Determine amount of chimney height re-
quired by subtracting total combined height
ofallpre-selectedcomponents(fireplaceand
chimney components from total desired
height.)
Reference Vertical Elevation Chart and deter-
minethenumberofchimneysections(quantity
and length) required.
SPECIAL OFFSET INSTRUCTIONS
Toclearanyoverheadobstructions,youmay
offset your chimney system using Security
Chimneys 30°offset and return elbows. Use
two elbows - an offset elbow to initiate the
offset and a return elbow to terminate it. A
30°offset elbow, angling in any direction,
may be the first component used off the top
of the fireplace flue collar.
Less than
10' (3m)
3' (914mm)
Min.
2' (610mm) Min.
10' (3m) 3' (914mm)
Min.
18" (457mm)
18" (457mm)
24"
(610mm) 24"
(610mm)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
14
11 0 11 1 0 0 0 279 0.28
17 1 5 0 1 0 0 432 0.43
21 ¹⁄₄ 19¹⁄₄ 2 0 0 0 540 0.54
27 ¹⁄₄ 23¹⁄₄ 1 1 0 0 692 0.69
35 2 11 0 0 1 0 889 0.89
47 3 11 0 0 0 1 1194 1.19
51 ¹⁄₄ 43¹⁄₄ 0 1 1 0 1302 1.30
57 ¹⁄₄ 49¹⁄₄ 1 0 0 1 1454 1.45
63 ¹⁄₄ 53¹⁄₄ 0 1 0 1 1607 1.61
67 ¹⁄₄ 57¹⁄₄ 2 0 0 1 1708 1.71
73 ¹⁄₄ 61¹⁄₄ 1 1 0 1 1861 1.86
81 ¹⁄₄ 69¹⁄₄ 0 0 1 1 2064 2.06
93 ¹⁄₄ 79¹⁄₄ 0 0 0 2 2369 2.37
97 ¹⁄₄ 81¹⁄₄ 0 1 1 1 2470 2.47
102 ¹⁄₂ 86¹⁄₂ 1 0 0 2 2604 2.60
109 ¹⁄₄ 91¹⁄₄ 0 1 0 2 2775 2.78
113 ¹⁄₂ 95¹⁄₂ 2 0 0 2 2883 2.88
119 ¹⁄₂ 911¹⁄₂ 1 1 0 2 3035 3.04
127 ¹⁄₄ 10 7 ¹⁄₄ 0 0 1 2 3232 3.23
137 ¹⁄₂ 11 5 ¹⁄₂ 1 0 1 2 3493 3.49
139 ¹⁄₄ 11 7 ¹⁄₄ 0 0 0 3 3537 3.54
143 ¹⁄₂ 11 11 ¹⁄₂ 0 1 1 2 3645 3.65
149 ¹⁄₂ 12 5 ¹⁄₂ 1 0 0 3 3797 3.80
155 ¹⁄₂ 12 11 ¹⁄₂ 0 1 0 3 3950 3.95
159 ³⁄₄ 13 3 ³⁄₄ 2 0 0 3 4058 4.06
165 ³⁄₄ 13 9 ³⁄₄ 1 1 0 3 4210 4.21
173 ¹⁄₂ 14 5 ¹⁄₂ 0 0 1 3 4407 4.41
183 ³⁄₄ 15 3 ³⁄₄ 1 0 1 3 4667 4.67
185 ¹⁄₂ 15 5 ¹⁄₂ 0 0 0 4 4712 4.71
189 ³⁄₄ 15 9 ³⁄₄ 0 1 1 3 4820 4.82
195 ³⁄₄ 16 3 ³⁄₄ 1 0 0 4 4972 4.97
201 ³⁄₄ 16 9 ³⁄₄ 0 1 0 4 5124 5.12
206 17 2 2 0 0 4 5232 5.23
212 17 8 1 1 0 4 5385 5.39
219 ³⁄₄ 18 3 ³⁄₄ 0 0 1 4 5582 5.58
230 19 2 1 0 1 4 5842 5.84
231 ³⁄₄ 19 3 ³⁄₄ 0 0 0 5 5886 5.89
236 19 8 0 1 1 4 5994 5.99
242 20 2 1 0 0 5 6147 6.15
248 20 8 0 1 0 5 6299 6.30
Height Of Number Of FTF8 Height Of
Chimney Only Chimney Lengths Chimney Only
Inches Feet/Inches 12" 18" 36" 48" MM M
Height Of Number Of FTF8 Height Of
Chimney Only Chimney Lengths Chimney Only
Inches Feet/Inches 12" 18" 36" 48" MM M
252 21 0 2 0 0 5 6401 6.40
258 21 6 1 1 0 5 6553 6.55
266 22 2 0 0 1 5 6756 6.76
276 23 0 1 0 1 5 7010 7.01
278 23 2 0 0 0 6 7061 7.06
282 23 6 0 1 1 5 7163 7.16
288 24 0 1 0 0 6 7315 7.32
294 ³⁄₄ 24 6 ³⁄₄ 0 1 0 6 7487 7.49
298 ¹⁄₄ 24 10 ¹⁄₄ 2 0 0 6 7576 7.58
304 ¹⁄₄ 25 4 ¹⁄₄ 1 1 0 6 7728 7.73
312 26 0 0 0 1 6 7925 7.93
322 ¹⁄₄ 26 10 ¹⁄₄ 1 0 1 6 8185 8.19
324 27 0 0 0 0 7 8230 8.23
328 ¹⁄₄ 27 4 ¹⁄₄ 0 1 1 6 8338 8.34
334 ¹⁄₄ 27 10 ¹⁄₄ 1 0 0 7 8490 8.49
340 ¹⁄₄ 28 4 ¹⁄₄ 0 1 0 7 8642 8.64
344 ¹⁄₂ 28 8 ¹⁄₂ 2 0 0 7 8750 8.75
350 ¹⁄₂ 29 2 ¹⁄₂ 1 1 0 7 8903 8.90
358 ¹⁄₄ 29 10 ¹⁄₄ 0 0 1 7 9100 9.10
368 ¹⁄₂ 30 8 ¹⁄₂ 1 0 1 7 9360 9.36
370 ¹⁄₄ 30 10 ¹⁄₄ 0 0 0 8 9404 9.40
374 ¹⁄₂ 31 2 ¹⁄₂ 0 1 1 7 9512 9.51
380 ¹⁄₂ 31 8 ¹⁄₂ 1 0 0 8 9665 9.67
386 ¹⁄₂ 32 2 ¹⁄₂ 0 1 0 8 9817 9.82
390 ³⁄₄ 32 6 ³⁄₄ 2 0 0 8 9925 9.93
396 ³⁄₄ 33 0 ³⁄₄ 1 1 0 8 10077 10.08
404 ¹⁄₂ 33 8 ¹⁄₂ 0 0 1 8 10274 10.27
414 ³⁄₄ 34 6 ³⁄₄ 1 0 1 8 10535 10.53
416 ¹⁄₂ 34 8 ¹⁄₂ 0 0 0 9 10579 10.58
420 ³⁄₄ 35 0 ³⁄₄ 0 1 1 8 10687 10.69
426 ³⁄₄ 35 6 ³⁄₄ 1 0 0 9 10839 10.84
432 ³⁄₄ 36 0 ³⁄₄ 0 1 0 9 10992 10.99
437 36 5 2 0 0 9 11100 11.10
443 36 11 1 1 0 9 11252 11.25
450 ³⁄₄ 37 6 ³⁄₄ 0 0 1 9 11449 11.45
461 38 5 1 0 1 9 11709 11.71
462 ³⁄₄ 38 6 ³⁄₄ 0 0 0 10 11754 11.75
466 ³⁄₄ 38 10 ³⁄₄ 0 1 1 9 11855 11.86
472 ³⁄₄ 39 4 ³⁄₄ 1 0 0 10 12008 12.01
478 ³⁄₄ 39 10 ³⁄₄ 0 1 0 10 12160 12.16
FTF8 VERTICAL ELEVATION CHART

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 15
A B FTF8-ES30 Number of FTF8 A B
Offset Height Offset/Return FTF8-S4 Chimney Sections Offset Height
(Inches) (Inches) Elbow Set Stabilizer 12" 18" 36" 48" (mm) (mm)
415³⁄₄ 1 0 0 0 0 0 102 400
924¹⁄₂ 1 0 1 0 0 0 229 622
12 29 ³⁄₄ 1 0 0 1 0 0 305 756
14 ¹⁄₄ 33 ¹⁄₂ 1 0 2 0 0 0 362 851
17 ¹⁄₄ 38 ¹⁄₂ 1 0 1 1 0 0 438 978
20 ¹⁄₄ 43 ³⁄₄ 1 0 0 2 0 0 514 1111
21 45 ¹⁄₄ 1 0 0 0 1 0 533 1149
22 ¹⁄₄ 47 ¹⁄₂ 1 0 2 1 0 0 565 1207
25 ¹⁄₄ 52 ¹⁄₂ 1 0 1 2 0 0 641 1334
26 ¹⁄₄ 54 ¹⁄₄ 1 0 1 0 1 0 667 1378
27 55 ³⁄₄ 1 0 0 0 0 1 686 1416
28 ¹⁄₄ 57 ³⁄₄ 1 0 0 3 0 0 718 1467
29 ¹⁄₄ 59 ¹⁄₄ 1 0 0 1 1 0 743 1505
31 ¹⁄₄ 63 1 0 2 0 1 0 794 1600
32 ¹⁄₄ 64 ¹⁄₂ 1 0 1 0 0 1 819 1638
34 ¹⁄₄ 68 ¹⁄₄ 1 0 1 1 1 0 870 1734
35 ¹⁄₄ 69 ³⁄₄ 1 0 0 1 0 1 895 1772
37 ¹⁄₄ 73 ¹⁄₄ 1 0 0 2 1 0 946 1861
38 ¹⁄₄ 75 1 0 0 0 2 0 972 1905
39 ¹⁄₄ 77 1 0 2 1 1 0 997 1956
41 ¹⁄₂ 80 ¹⁄₂ 1 0 1 4 0 0 1054 2045
43 ¹⁄₄ 83 ³⁄₄ 1 0 1 0 2 0 1099 2127
44 ¹⁄₄ 85 ¹⁄₄ 1 0 0 0 1 1 1124 2165
45 ¹⁄₄ 87 ¹⁄₂ 1 0 0 3 1 0 1149 2223
46 ¹⁄₄ 89 1 0 0 1 2 0 1175 2261
48 ¹⁄₄ 91 ¹⁄₂ 1 0 2 0 2 0 1226 2324
49 ¹⁄₄ 94 ¹⁄₄ 1 0 1 0 1 1 1251 2394
50 ¹⁄₄ 95 ³⁄₄ 1 0 0 0 0 2 1276 2432
51 ¹⁄₄ 97 ³⁄₄ 1 0 1 1 2 0 1302 2483
54 ¹⁄₄ 103 1 0 0 2 2 0 1378 2616
55 ¹⁄₄ 104 ¹⁄₂ 1 0 1 0 0 2 1403 2654
56 ¹⁄₂ 106 ¹⁄₂ 1 0 2 1 2 0 1435 2705
58 ¹⁄₄ 109 ³⁄₄ 1 0 0 1 0 2 1480 2788
62 ¹⁄₂ 116 ³⁄₄ 1 1 1 0 3 0 1588 2965
65 ¹⁄₂ 122 1 1 0 1 3 0 1664 3099
67 ³⁄₄ 125 ¹⁄₂ 1 1 2 0 3 0 1721 3188
69 ¹⁄₂ 128 ³⁄₄ 1 1 0 0 1 2 1765 3270
70 ³⁄₄ 130 ³⁄₄ 1 1 1 1 3 0 1797 3321
73 ³⁄₄ 136 1 1 0 2 3 0 1873 3454
75 ¹⁄₂ 139 1 1 0 0 0 3 1918 3531
79 ³⁄₄ 146 ¹⁄₄ 1 1 1 0 4 0 2026 3715
80 ³⁄₄ 148 1 1 1 0 0 3 2051 3759
82 ³⁄₄ 151 ¹⁄₂ 1 1 0 1 4 0 2102 3848
83 ¹⁄₂ 153 1 1 0 1 0 3 2121 3886
OFFSET ELEVATION CHART
A1
C1
B1
B2
C2
A2
Figure 44 Figure 45 Figure 46
Figure 43
FTF8-E30
Return Elbow*
FTF8 Chimney
Sections
FTF8-30
Offset Elbow*
AB
48"
(1219 mm)
* Part of Offset/Return Package, Model FTF8-ES30.
Stabilizer
A
1
20' Max.
(6m)
B
1
10' Max.
(3m)
A
1
C
1
B
1
B
2
C
2
A
2

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
16
RETURN ELBOW ASSEMBLY
Return elbows install the same way as round
terminations and stabilizers:
Step 1. Hold return elbow over top of last
chimney section.
Step 2. Centerinnerslip sectionintoinner flue
pipe-slip down.
Step3.Centerouterlockingsectionoverouter
chimneypipe-pushdownuntillockingjointhas
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 49 ).
Theoffset and return elbows may be attached
together, or a section or sections of chimney
may be used between, but do not exceed 20'
(6.1m)intotallengthbetweenelbows(
Figure
44
). If sections of pipe exceed 10' (3 m)
betweenelbows, achimneystabilizer mustbe
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)
(
Figures45and46 ). Example:IfC1=10'(3m)
then C2cannot exceed 10' (3 m).
Ifanoffsetexceeds6'inlength,eachchimney
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 (
Figure 47 ).
Figure 47
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( Figure48 ).Besuretodrillonlythrough
theouterchimneycasting.Donotpuncturethe
inner flue.
Figure 48
Returnelbowsupportstrapsmustbesecurely
attached under tension (in shear) to structural
framing members above.
OFFSET CALCULATIONS
1. Use Offset Chart to determine amount of
horizontal offset (A) and height (B) for various
chimney sections.
2. Use “Height of Chimney Only” column to
determine combinations of pipe used above
returnelbowtoachievedesiredheights.Refer-
ence Components Effective Height Chart in
vertical elevation chart section.
3. Use Elevation Chart as job estimator only.
Addnecessaryfirestopspacersandstabilizers
as required. Firestop spacers must be used as
shown in
Figures 29 and 30 and stabilizers as
shown in
Figure 35 .
INSTALLING OFFSETS
First,reviewOffsetElevationChart and Figure
43 on page 15 for reference.
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.
Measure height to the ceiling from the top of
fireplace-dimension “B.” Use Offset Elevation
Chart to find dimension “A.” Mark point where
youwilldriveyournailtoshowthecenterpoint
for your offset ceiling cut.
Step2.ProceedbyusingtheStraightUpInstal-
lationInstructionsforcuttingandframingceil-
ing and roof openings.
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.
OFFSET ELBOW ASSEMBLY
Offset elbows install the same as chimney
sections.First,snaptheinnersectionINTO the
precedinginnersectionof 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.
Figure 49
Note:Thereturnelbowassemblyperformsthe
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 sub-
sequentchimneysectionsaresecurelyattached
by testing as noted above.
CHIMNEYOFFSET30°THROUGHFLOOR
OR CEILING
It may be necessary to assemble the chimney
at 30°when passing through the floor or
ceilingarea. UsetheF8FS30-2firestopspacer
as shown in Figures 50 and 51 .
Support the chimney at floor or ceiling pen-
etration with a FTF8 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.
Chimney
Section
Joints
No. 8 x ¹⁄₂" SMS
Screws Required at
Every Joint Past 6'
No Screws Required in
Joints for First 6' of Offset
4'
6'
Underside of Chimney
Return Elbow
Maximumoffsetofthechimneysystemis30°.
Two offset elbows must not be assembled to
form a 60°offset. However, two sets of offset
andreturnelbowsmaybeusedonasingleflue
system,providedthetotalheightofthesystem
exceeds 25' (7.6 m).

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 17
Figure 53
Outside combustion air may be run upwards
orverticallythroughframingandceilingjoists,
withthehoodinstalledthroughanoutsidewall
and3'(914mm)belowthetermination.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.
CAUTION: NEVER LOCATE THE AIR INLET
WHEREIT COULDBE BLOCKEDBY SHRUBS,
SNOW DRIFTS, ETC. NEVER LOCATE THE
AIRINLET IN GARAGEOR ANYAREA 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-
MENDEDTHAT THECOMBUSTIONAIR DUCT
BE INSULATED.
Note: Do not terminate combustion air kit in
attic space under any circumstances.
CAUTION:INNOEVENTMAYTHETOTALDUCT
FOR BRINGING IN OUTSIDE AIR EXCEED 50'
(15.2 M).
GAS LINE INSTALLATION
The CST and CPF fireplaces have been ap-
proved to accept a ¹⁄₂" (13 mm) gas line for an
approvedgasappliance.Alwayshavetheappli-
ance installed by a qualified, licensed plumber
inaccordancewithalllocalbuildingcodes.The
gas line may enter either end of the fireplace.
CAUTION:PLUMBINGCONNECTIONSSHOULD
ONLY BE PERFORMED BY A QUALIFIED, LI-
CENSEDPLUMBER.MAINGASSUPPLYMUST
BEOFF WHENPLUMBINGGASLINETO FIRE-
PLACE OR PERFORMING SERVICE.
Ifyou’reinstallingagasline,connectitbefore
the fireplace is framed and enclosed in the
finishedwall.The gas knockoutisdetermined
by a 1 ¹⁄₈" (29 mm) round indentation located
atthebottomandslightlyoffcenterintheside
refractories.
Figure 50
Figure 51
GLASS DOORS
Both the CST and CPF fireplaces require the
use of glass doors. The selection of glass
doors available for use with these fireplaces
are: 38ABF, 38ABF-BB and 38TBA-BB. For
the CPF system, end panels model 38AEP
and 38AEP-BB are available. Refer to the
Suggested List Price Sheet. The use of any
other non-listed door on these fireplaces
may result in a potential fire hazard and is
not recommended.
IMPORTANT: IT IS NECESSARY TO ORDER
AND INSTALL THE DOOR STYLE OF YOUR
CHOICE.GLASSDOORSARENOTOPTIONAL.
CAUTION: REMOVE THE PLASTIC PROTEC-
TIVE COATING FROM THE DOORS BRASS
PIECESBEFORE ASSEMBLY ANDINSTALLA-
TION. FAILURE TO REMOVE THE COATING
BEFORE FIRST USE WILL RESULT IN DAM-
AGE TO THE BRASS FINISH.
Make a careful inspection of all parts before
installingthedoorstoinsuretheyareundam-
aged and complete. There will be two (2)
glass door assemblies for both sides of the
CST-38 fireplace and two (2) glass door as-
semblies plus one (1) end panel for the CPF-
38 fireplace.
F8FS30-2
Firestop
Spacer
FTF8-S4
Stabilizer
2" (51mm)
Min. Air
Space
2" (51mm)
Min. Air
Space
30°Firestop
and Attic Above
10'
(3m) Max.
Attic Space
2" (51mm)
Min. Air
Space
30°Firestop
and Room Above
10'
(3m) Max.
Room Above
2" (51mm)
Min. Air
Space
F8FS30-2
Firestop
Spacer
FTF8-S4
Stabilizer
Combustion
Air Kit
CAUTION:DO NOTTOUCHTHEDOORSWITH
YOUR HANDS WHILE THE FIREPLACE IS IN
USE.ALWAYSUSEDOORHANDLES.DOORS
WILL BECOME VERY HOT WHEN FIREPLACE
IS IN USE.
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
Models CST-38 and CPF-38 fireplaces.
WARNING:THESEFIREPLACES SHOULD
BE OPERATED ONLY WITH THE DOORS
FULLY CLOSED ( FIGURE 52 ).
Figure 52
OPTIONAL EQUIPMENT
Combustion Air Kit
Use combustion air kit, Model FOAK-4 or
FOAK-4LD ( Figure 53 ), with these fireplace
systems. Refer to installation instructions
packed with the air kit for specific information.
Outsideairdrawnintothefireplacesuppliesair
to the fire for combustion. The outside air kit
mustbeinstalledbeforethe fireplaceisframed
and enclosed in the finished walls.
There is a one-hand operated shut-off valve
located in the enclosed corner 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 operation and
fully closed when the fireplace is not in use to
prevent outside air from entering your home.
If additional length of duct is necessary, pur-
chase locally available Class 0 or Class 1 duct-
ing. The duct may extend up to 50' (15.2 m) in
any direction.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
18
THEKNOCKOUTISALWAYSREMOVEDFROM
INSIDE THE FIREPLACE. DO NOT REMOVE
THE KNOCKOUT UNLESS YOU ARE INSTALL-
ING A GAS LINE. Ifremovalisattempted from
theouterwrapper,side-refractorydamagemay
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.
Install a ¹⁄₂" (13 mm) gas supply line through
fireplace wall for connection to a decorative
gas appliance inside the firebox. Outside, the
gassupplylinemustconnecttoagasshut-off
valve usually recessed flush into the wall or
floor. The valve should be controlled by a
removable valve key for safety.
Always plumb gas line installation per local
codes. Check all connections and test for gas
leaks, using a gas leak test solution (also
referred to as bubble leak solution).
Note: Usingasoapywatersolution(50%dish
soap, 50% water) is an effective leak test
solution but it is not recommended, because
the soap residue that is left on the pipes/
fittingscanresultincorrosionovertime. Never
use an open flame to check for leaks.
IMPORTANT: REPACK INSULATION MATE-
RIAL IN SQUARE HOLE AROUND GAS LINE,
INTERIOR AND EXTERIOR, TO SEAL.
In Canada, this provision is intended for con-
nection to a decorative gas appliance only in
accordancewiththelatestNationalGasInstal-
lation Code, CAN 1-B149.1. This complies
with the ULC S610 standard.
Forall areasotherthan Canada,thisprovision
isintendedonlyforconnectiontoadecorative
gasapplianceincorporatinganautomaticshut-
offdeviceandcomplyingwiththestandardfor
Decorative Gas Appliances for installation in
vented fireplaces, ANSI Z21.60. Install in ac-
cordance with the National Fuel Gas Code,
ANSI Z223.1.
CAUTION: WHEN USING THE DECORATIVE
GAS APPLIANCE, THE FIREPLACE DAMPER
MUSTBESETINTHEFULLYOPENPOSITION.
COLD CLIMATE INSULATION
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 caulking material only
on fireplace facing to seal. Also, the outside
air inlet duct should be wrapped with non-
combustible insulation to minimize the for-
mation of condensation. Do not place insu-
lation materials directly against the chimney
sections.
Note:2"(51mm)airspacemustbepreserved
for all materials extending for any continuous
length adjacent to the chimney.
It is especially important to insulate between
thestudsofanoutsidechasecavityandunder
the floor if the floor is above ground level. Do
not place insulation directly against the fire-
place or chimney system.
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.
Note:Theheadermayrestonthetwo(2)metal
top spacers on top of the unit but the header
mustnotbenotchedtofitaroundthespacers.
InCanada,theminimumheightforacombus-
tible mantel is 18" (457 mm) above the open-
ing. Figure 54 shows typical Canadian instal-
lation.IninstallationsotherthanCanada,com-
bustiblemantelsandtrimmaybeinstalled12"
(305mm)abovetheopeningasperNFPA211,
Section 7-3.3.3. and Figure 55 . 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.
Figure 55
Figure 54
Hearth Extensions and Wall Shields
A hearth extension must be installed with
all fireplaces. It is to protect the combustible
floorin frontof thefireplacefrombothradiant
heat and sparks. The hearth extension must
extend 8" beyond both sides of the fireplace
opening and 16" beyond the front ( see Figure
56 ) . Use a hearth extension constructed of a
durable noncombustible material having an
equalorbetter(lowerkvalue)insulatingvalue
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 19 .
Note: Any noncombustible material whose k
value is less than .84 or whose r value is more
than 1.19 is acceptable.
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) .
For the CST-38 a wall shield is required where
a continuous perpendicular side wall is within
18"ofthefireplaceopening( Figures57&58) .
Use a 40" W x 40" H wall shield constructed of
a durable, noncombustible material having an
equal or better (lower k value) insulating value
thank=.84 BTU IN/FT2HR °F. Atnotimemay
aperpendicularsidewallbelocatedcloserthan
8" from the fireplace opening.
Iffireplaceis installed diagonallyacrossa90°
corner; no wall shields are required.
18"
(457 mm)
Min.
Finished Wall Spacer
Combustible
Mantel
and Trim
8"
(203 mm)
Max. False
Header
Typical Canadian Installation
Fireplace Opening
12"
(305 mm)
Min. 5 ¹⁄₄"
(133 mm)
Finished Wall Spacer
Combustible
Mantel
and Trim
8"
(203 mm)
Max.
False
Header
Typical Installation
1 ¹⁄₂"
(38 mm)
Fireplace Opening

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 19
Hearth Extension Dimensions
CST-38 CPF-38
A16" 16"
(406 mm) (406 mm)
B28 ¹⁄₂" 32 ¹⁄₂"
(724 mm) (826 mm)
C8" 8"
(203 mm) (203 mm)
D44 ¹⁄₂" 48 ¹⁄₂"
(1130 mm) (1232 mm)
Figure 56
A
B
D
CC
Answer - The minimum required thickness of the Micore 160 is .417”,
therefore round up to nearest standard thickness available which is 1/2”.
** If the hearth extension material(s) that is intended to be used is NOT listed
onTable1, the material can stillbe usedif thematerial(s) isnoncombustible.
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).
Note:AlsoseeNFI(NationalFireplaceInstitute)CertificationManualsshowing
other acceptable calculation methods and acceptable alternate materials
which can be used.
Listed Material
k (per inch) r (per inch) Listed Min.Thickness
Listed Material .84
KL
1.19
r
L
1
"
T
L
** Approved Alternate Materials for Floor/Hearth Protection
AlternativeMaterials Thermal Values MinimumThickness
(rounded to nearest 1/8 inch)
k (per inch)
KM
r (per inch)
r
M
Min. Thickness
T
M
Kaowool M Board .47 2.13 .56" (1/2")
Micore 160™
U.S. Gypsum
.35 2.86 .42" (3/8")
Micore 300™
U.S. Gypsum
.46 2.17 .55" (1/2")
Durock™ Cement Board
U.S. Gypsum
1.92 .52 2.29" (2-1/4")
Hardibacker™ 1.95 .513 2.32" (2-3/8")
Hardibacker 500™ 2.30 .435 2.74" (2-3/4")
Cultered Stone Hearth-
stone™ 2.82 .355 3.36" (3-3/8")
Wonderboard 3.23 .31 3.85" (3-7/8")
Super Firetemp M
Johns-Manville
.61 1.64 .73" (3/4")
Super Firetemp L
Johns-Manville
.54 1.85 .64" (5/8")
Face brick 9.00 .111 10.71" (10-3/4")
Common brick 5.00 .20 5.95" (6")
Cement mortar 5.00 .20 5.95" (6")
Ceramic tile 12.5 .08 14.88" (14-7/8")
Marble 11 .09 13.10" (13-1/8")
Table 1
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.
Example: If Micore 160 is to be used for the hearth extension fireplace,
how thick must this material be?
kM= k value per inch of
alternate material
rM= r value per inch of alternate material
TM= minimum thickness required for alternate material
TS = standard thickness of the alternate material
kL= k value per inch of listed material
rL= r value per inch of listed material
TL= minimum thickness of listed material
Note: An asterix “*” indicates, it is a value taken from Table 1 .
Using the k formula:
Minimum k-value (per Inch) of Specified min.
thickness of = alternate material (kM) x thickness
alternate k-value (per inch) of listed
material (TM) of listed material (kM) material (TL)
TM(inches) = kMxT
L
*.84
TM(inches) = *.35 x 1"
*.84
.416 (inches) = .416 x 1"
Answer - The minimum required thickness of the Micore 160 is .417”,
thereforerounduptoneareststandardthicknessavailablewhichis1/2”.
Using the r formula:
Minimum r-value (per Inch) Specified min.
thickness of = of listed material x thickness
alternate r-value (per inch) of listed
material of alternate material material
TM(inches) = rLxT
L
rM
TM(inches) = *1.19 x 1"
*2.86
.416 (inches) = .416 x 1"

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
20
Maximum Thickness of Hearth Extension
when Fireplace is on the Floor.
5 ⁵⁄₈"*
(143 mm)
Max.
*5 ¹⁄₈" (130 mm)
If “C” Style Door
Is Used.
Figure 59
FINISH TO YOUR TASTE
Thereareawidevarietyof“finishedlooks”for
your CST and CPF fireplace from formal wall
decor with elaborate mantels to rustic wood
paneling or warm brick facings.
Only noncombustible materials like marble,
stone, tile, brick, etc. may overlap the black
frontfacing,butbecarefulnottointerferewith
theoperationoftheglassdoors. Sealalljoints
between the black facing and wall surrounds
topreventcoldairintrusion.Usenoncombus-
tible 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
arekeptwithintheshadedareas,asillustrated
in Figures 60 and 61 .
WARNING: WHEN INSTALLING HEARTH
EXTENSION IN FRONT OF THE FIRE-
PLACE,THEFIREPLACEMUSTBERAISED
IF HEIGHT OF HEARTH EXTENSION EX-
CEEDS 5 3/4" ABOVE BOTTOM OF FIRE-
PLACE ( FIGURE 59 ).
Figure 57
Figure 58
BA
C
C25 ³⁄₁₆"
End Opening
Hearth
Extension
8" (203 mm) Min.
to Fireplace Opening
Side Wall
Model CPF-38
If it is desired to elevate a marble hearth ex-
tensionto alevelof5”or moreabove thefloor
surface. What combination of noncombus-
tiblematerialscanbeused toaccomplishthis?
If common brick is used so that the 3 1/2”
dimension is the height, “R” for the common
brick becomes:
brick
“R”M= rMx TS= 0.20 x 3 1/2" = .70
Using 1/2” of mortar to set the brick, “R” for
the mortar is calculated as follows:
mortar
“R”M= rMx TS= 0.20 x 1/2" = .10
Next,a3/4"marble slabset in1/2" mortarcov-
ers the brick, “R” for the marble and mortar
becomes:
marble
“R”M= rMx TS= 0.05 x 3/4" = .038
mortar
“R”M= rMx TS= 0.20 x 1/2" = .10
The sum of all “R values” is: .70 + .10 +. 038
+ .10 = .938
ThiswouldNOTbeanacceptablecombination
of material for the hearth extension since the
totalcalculated“Rvalue”ofthematerialsused
is under the required “R value” of 1.19. An
additional layer of insulating materials must
be used.
Note: Also see NFI Certification Manuals for
expanded explanation on calculating “R val-
ues” when multiple materials are used.
Calculating Minimum Thickness if Multiple
Materials are Used
At times it is important to know what
combination of materials are acceptable for
use as floor protection. The “R values” are
usedtodetermineacceptablecombinationsof
materialsbecause“Rvalues”areadditivewhere
r and k values are not.
“Rvalue”= 1/k = “r”xthicknessofmaterial
used
Example: Given that the required “R value”
for a suitable floor protector used must be
equal to or greater than:
“R” = rLx TL= 1.19 x 1” = 1.19.”
WARNING: THE CRACK BETWEEN THE
FIREPLACE AND THE HEARTH EXTEN-
SION MUST BE SEALED WITH A NON-
COMBUSTIBLE MATERIAL.
WARNING: WHEN INSTALLING THE
HEARTH EXTENSION BE CAREFUL NOT
TO BLOCK THE HEAT-CIRCULATING AIR
INLET GRILL.
BA
C
C
8" (203 mm) Min.
to Fireplace Opening
Side Wall
Model CST-38
D
Protected
Side Wall.
(Required
When Less
Than 18" To
Fireplace
Opening)
40"
40"