Intertherm DELUXE 36 User manual

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 1
RETAIN THESE INSTRUCTIONS
FOR FUTURE REFERENCE WH Report No. J20027921-231
36" Wood Burning Fireplaces
P/N 800,020M REV. N/C 05/2001
BM36ST
MODELS
DELUXE 36
MANUFACTURED HOME
FIREPLACES
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.
PLEASE RETAIN THIS MANUAL FOR FUTURE REFERENCE.
INSTALLATION
INSTRUCTIONS

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
2
TABLE OF CONTENTS
Safety Rules .................................... page 2
Tools and Building Supplies ............ page 2
Precautions ..................................... page 3
Introduction ..................................... page 3
Clearances/Height Requirements..... page 3
Chimney System ............................. page 3
Assembly Outline............................. page 4
Location of Fireplace ....................... page 4
Assembly Steps ............................... page 4
Preinstallation Notes........................ page 5
Clearances ....................................... page 5
Installing the Fireplace ..................... page 5
Fireplace Specifications .................. page 6
Framing Wall Variations .................. page 7
Framing Specifications.................... page 7
Combustion Air Kit Installation ........ page 8
Installing the Chimney System ........ page 8
Ten Foot Rule Summary .................. page 11
Chimney Component Calculations ... page 11
Special Offset Instructions............... page 11
30°Offset through Floor/Ceiling ...... page 11
Vertical Elevation Chart ................... page 12
Offset Calculations........................... page 12
Offset Elevation Chart ..................... page 13
Installing Offsets.............................. page 14
Combustion Air Kit Operation .......... page 14
Gas Line Connection........................ page 15
Glass Doors ..................................... page 15
Cold Climate Insulation.................... page 15
Fireplace Finishes ............................ page 15
Mantels and Trim............................. page 15
Hearth Extensions/Wall Shields ....... page 15
Finish Requirements ........................ page 17
Installation Components .................. page 17
IMPORTANT: PLEASE READ AND
UNDERSTAND THESE RULES TO
FOLLOW FOR SAFETY.
1. Before starting your fireplace installation,
read these installation instructions carefully to
besure you understandthemcompletely and in
entirety. Failure to follow them could cause a
fireplacemalfunction resulting inseriousinjury
and/or property damage.
The manufacturer is not responsible for any
smoking or related problems that may result
from the lack of adequate combustion air. It is
the responsibility of the builder/contractor to
ensure that adequate combustion air has been
provided for the fireplace.
13. DO NOT use a fireplace insert or any other
products not specified herein by the manufac-
turerforuse with this fireplace. All gas log sets
must be operated with the damper clamped
open, including unlisted “vent free” log sets.
Listed “vent-free” log sets may be operated
with the damper closed.
14. "Smoke free” operation is not warranteed
nor are we responsible for inadequate system
draft caused by mechanical systems, general
construction conditions, inadequate chimney
heights, adverse wind conditions and/or un-
usual environmental factors or conditions be-
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. These items should be inspected by your
distributor or qualified factory representative
to ensure safe condition. When in doubt, con-
sult your distributor.
16. For additional safety considerations and
complete operating instructions, refer to the
Care and 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 (noncombustible)
Fireplace surround and hearth
extension materials (noncombustible)
2. Always check your local building codes. The
installationmustcomplywithalllocal,regional,
state and national codes and regulations.
3.ThisfireplacemustbeinstalledwithFireCraft's
FTF8(8"insidediameter)ChimneySystemonly.
These systems are intended for use in any
application where a traditional masonry type
fireplace would apply. The chimney system
must always vent to the outside of the building.
4. To ensure a safe fireplace system and to
preventthebuild-upof sootandcreosote, inspect
and clean the fireplace and chimney prior to use
and periodically during the heating season.
5. Use solid fuel only. DO NOT use chemical
chimney cleaners or flame colorants in your
fireplace.
Never burn treated construction lumber or
scraps. These woods burn excessively hot
and may contain chemicals used to treat
insects and fungus. When burned, these
chemicals can pose a significant hazard.
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. Always keep flue damper open when heat is
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
preventany possible electrical shockorburns.
11.Thisfireplace isnotintendedtoheatanentire
home or be used as a primary heat source. It is
designed to ensure homeowner comfort by pro-
viding supplemental heat to the room.
12. Always ensure that an adequate supply of
replacement combustion air from the outside
of the house is accessible to the fire to support
normalcombustion.Fireplaces consumelarge
volumes of air during the normal combustion
process.In the event thehomeistightly sealed
with modern energy efficient features, the op-
tional combustion air kit may not provide all
the air required to support combustion.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 3
Figure 1
TYPICAL INSTALLATION
*Construction Materials:
• framing materials • paneling
• particle board • flooring
• millboard • dry wall
• plywood • etc.
PRECAUTIONS
Note: These fireplace systems are not difficult
to install. However, in the interest of safety, it is
recommendedthattheinstaller beaqualifiedor
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
clearances to combustible materials, proper as-
sembly of component parts, height of the chim-
ney system, the proper use of accessories sup-
plied by the manufacturer and the techniques
employed in using finishing materials applied to
the wall surrounding the fireplace, hearth exten-
sions and wall shields. Each of these topics will
be covered in thorough detail throughout this
manual. Please give each your special attention
as you progress with your installation.
INTRODUCTION
General Information
The BM36ST Series is a radiant-heat, two-
sided fireplace with standard glass doors. A
steel grate is also included with the BM36ST to
properly position the fire. An outside combus-
tion air kit is available as standard equipment.
Note: Illustrations shown reflect “typical”
installations with nominal dimensions and
are for design and framing reference only.
Actual installations may vary due to indi-
vidual design preferences. However, always
maintain minimum clearances to combus-
tible materials and do not violate any specific
installation requirements.
The BM36ST fireplace has been tested and
listed by Warnock Hersey Inc. (Report No.
J20027921-231) to the UL 127 standard for
U.S. installations.
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.
To prevent possible personal injury or fire haz-
ard, the fireplace and chimney must be en-
closed when installed in or passing through a
living area where combustibles or people may
come in contact with it.
The total height of your fireplace system from
thesurfacethefireplacerestsontothe chimney
topmustnot exceed 60' (15.2m) and must also
meet minimum system height chart. As with all
chimney installations, avoid overhead obstruc-
tions such as trees, power lines, etc. Addition-
ally chimney terminations must meet certain
clearance to roof requirements detailed in the
paragraph titled Ten-Foot Rule Summary.
CHIMNEY SYSTEM
These fireplaces are designed and code listed
for use with FireCraft's FTF8 chimney System
only.AlwaysuseFireCraft'sFTF8chimneycom-
ponentswith these fireplaces. Do not modifyor
alter these components as this may cause a
potentialserioushazard and void the Warranty.
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.
Chimney
And
Termination
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.
WARNING:DO NOTOBSTRUCTTHE COL-
LAR OPENINGS AROUND THE BASE OF
THE CHIMNEY AT THE TOP OF THE FIRE-
PLACE.NEVERUSEBLOWNINSULATION
TO FILL THE CHIMNEY ENCLOSURE.
The BM36ST system consists of three “sub-
systems”:
1. The Fireplace and Door Assemblies
2. The Chimney and Termination
3. The Combustion Air Kit
CLEARANCES AND HEIGHT
REQUIREMENTS
The BM36ST fireplace may be placed on or
nearnormalconstructionmaterials*.Thecom-
bustion air kit, firestop spacer and roof flash-
ings (not chase flashings) may be placed di-
rectlyon oragainstnormal construction mate-
rials*.The chimneyrequires aminimum2" (51
mm)airspaceto combustibles.Acombustible
mantel may be installed 12" (305 mm) above
the fireplace opening as per NFPA 211, Sec-
tion 7-2.3.3. (Refer to Figure 43 on page 15).
The fireplace opening must keep a minimum of
12" (305 mm) from a combustible side wall. A
perpendicular side wall can not be closer than
12" (305 mm) from the fireplace opening.
WARNING: DO NOT PACK OR FILL RE-
QUIRED AIR SPACES WITH INSULATION
OR OTHER MATERIAL. NO MATERIAL IS
ALLOWED IN THESE AREAS. SECURE
THE AIRSPACE AROUND THE CHIMNEY
WITH THE FIRESTOP/THIMBLE BEFORE
COMPLETINGTHEINSTALLATION.MAIN-
TAIN2"CLEARANCE BETWEENCHIMNEY
AND THIMBLE.

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4
Figure 4
Figure 2
Note: Do not insulate the chimney enclosure
cavitywithblownorfilltypeinsulationmaterials.
Note: Localcodes may notrequire firestopping
at the ceiling levels for outside chase installa-
tions. However, it is recommended for safety
and the reduction of heat loss.
Chimney Height
The total height of your completed fireplace
system from the surface the fireplace rests on
to the chimney top must not exceed 60' and
mustalsomeetminimumheightrequirements.
Refer to the minimum system height chart.
Figure 3
Firecraft's FTF10 Pipe
Vertical Installation 15' 0"
One Offset 18' 0"
Two Offsets 24' 0"
Minimum System Height
Chimney Enclosure
Construct a box-like framed structure to sur-
round the fireplace and chimney within the
confines of the manufactured home, not nec-
essarily above the roof line. As with all chim-
ney installations, avoid overhead obstructions
such as trees, power lines, etc. The chimney/
fireplace enclosure should be constructed and
insulated just like any outside wall.
In a cold climate, we recommend the base of
the chimney/fireplace enclosure should also
be insulated between the solid continuous
floor beneath the fireplace and the chase bot-
tom. Insulation in a cold climate installation is
not required for safety.
ASSEMBLY OUTLINE
Before You Start
Check your inventory list to be sure you have all
the necessary parts supplied in good usable
condition.Checkalsoforanyconcealeddamage.
Damper
Closed Damper
Open
LOCATION OF FIREPLACE
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.
ASSEMBLY STEPS
Note:The following steps representthe normal
sequence of installation. Each installation is
unique, however, and might require a different
sequence.
1. First position the fireplace, then build the
framing around it.
2. Install the chimney system.
3. Install 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).
5. Install both “All-GlassTM” door assemblies.
6. Complete finish wall material, surround and
hearth extension to your individual taste.
Refer to Figure 1 to get a general idea of each
element of your fireplace system.
Carefully consider the position of the fireplace
openings with respect to the location of adja-
cent or nearby stairwells, bath or kitchen ex-
haustfansand/or returnairregistersforforced
air furnaces/air conditioners that could cause
a smoking fireplace condition if the house is
tightly insulated. See Figure 3 for examples.
A continuous perpendicular side wall cannot
be closer than 12" (305 mm) from the fire-
placedooropeningunder any circumstances,
even if protected ( see Figure 4 ).
Checktheoperationofthedamper.Thedamper
is controlled through the use of a control lever
located within the firebox opening at the top
center in front of the firebox lintel ( Figure 2 ).
The control lever snaps into place at either
extreme of its range of motion. When locked
in position all the way to the right, the damper
is open. When locked in position all the way to
the left, the damper is closed.
36”
Door Opening
38 1/4”
***12”
Min.
Drywall
Side
Refractory
***12” Minimum To Combustible Wall
Perpendicular To Front Of Fireplace
24”
12”

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 5
Note:Install the hearth extensiononly as illus-
trated.
The safety strips should extend from front of
the fireplace at least 1 ¹⁄₂" and should extend to
be at least flush with the sides. In the event a
wooden support is used to elevate the fire-
place above the floor, a “Z” type safety strip
should be fabricated and used to protect the
front surface of the wood support as well as
the floor beneath the hearth extension ( see
Figures 7 and 8 ). The safety strips should be
tacked down to prevent possible movement.
Note: The “Z” type safety strip is not supplied.
Step 3. Refer to fireplace drawings and specifi-
cationsonpages6and7forframingdimensions
and details. Frame appliance enclosure as illus-
trated in Figures 10 through 13 on page 7.
IMPORTANT: UNDER NO CIRCUMSTANCES
CAN THE FIREPLACE TOP SPACERS ( SEE
FIGURE9 )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 DI-
RECT CONTACT WITH THE TOP SPACERS
BUT MAY NOT BE SUPPORTED BY THEM.
CAUTION: DO NOT BLOCK THE HEAT-CIRCU-
LATING AIR INLET AND OUTLET PORTS ON
CIRCULATING MODELS. DOING SO MAY RE-
SULT IN A POTENTIAL FIRE HAZARD.
CAUTION: THE STRUCTURAL INTEGRITY OF
THE MANUFACTURED HOME FLOOR, WALL,
CEILING AND ROOF MUST BE MAINTAINED.
The firestop thimble supplied with the unit
must be used on a manufactured home instal-
lation. The firestop thimble must extend com-
pletely though the roof cavity to the outermost
plane of the roof (
See Figures 23,24 and 25 ).
Maintain 2" clearance between the thimble and
the chimney.
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.
CLEARANCES
Minimum clearance to combustibles for the
appliance is as follows: sides - ¹⁄₂" (13 mm),
floor- 0" (0mm),adjacentwall - 12" (305mm),
ceiling - 37 ¹⁄₂" (953 mm).
INSTALLING THE FIREPLACE
IMPORTANT: Plated polished brass glass
doors may have a plastic covering over all
brass pieces for protection during shipping
andhandling. The plasticcoveringshould be
removed after installation of the fireplace
before its use. Under the plastic covering is
a protective lacquer coating which should
not be removed. In some instances, if it is
removed, irreversible damage to the brass
finish could occur.
Step 1. Slide the fireplace into its final position,
for later framing construction.
The fireplace may not be recessed into a com-
bustible floor. Maintain the floor to hearth
clearance established by the fireplace lower
front face.
Step 2. Insert the provided metal safety strips,
beneaththe fireplace as illustrated( Figures5, 6
and 7 ). The safety strips should overlap ¹⁄₂" for
continual coverage of the floor.
Note: Safety strips are not required when fire-
place rests on a noncombustible surface.
PRE-INSTALLATION NOTES
The BM36ST is a unique two-sided fireplace and
requires certain minor variations from the nor-
mal framing procedures for both new construc-
tion and remodeling. In some cases, surface
headersmay beinstalledabovethe fireplaceface
so that necessary clearances will be maintained
between the chimney and framing members.
The fireplace may be installed directly on a
combustible floor or raised on a platform of an
appropriate height. Do not place fireplace on
carpeting, vinyl or other soft floor coverings. It
may, however, be placed on flat wood, ply-
wood, particle board or other hard surfaces. Be
sure fireplace rests on a solid continuous floor
or platform with appropriate framing for sup-
port and so no cold air can enter room from
under the fireplace.
WARNING: IF INSULATION IS USED, THE
FIREPLACE MUST NOT BE PLACED
AGAINST IT. INSULATION OR VAPOR
BARRIERS,IF USED,MUSTBE SECURED
TO ASSURE INSULATION AND VAPOR
BARRIERS REMAIN IN PLACE.
Figure 6
Figure 5
The fireplace must be positioned, and then
the framing built around it.
Usually, no special floor support is needed for
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. Shippingweights forthefireplace may
be found on page 17.
2. Measure the square footage of the floor
space to be occupied by the system, sur-
rounds and hearth extensions.
3. Note the floor construction, i.e. 2 x 6’s, 2 x
8’sor2 x 10’s, single or double joists, typeand
thickness of floor boards.
4. Use this information and consult your local
building code to determine if you need addi-
tional support.
WARNING: DO NOT PACK OR FILL THE
MINIMUM REQUIRED AIR SPACES WITH
INSULATION OR OTHER MATERIAL. NO
MATERIALISALLOWEDINTHESEAREAS.
Hearth
Extension
Hearth
Extension
1/2" (13 mm)
Clearance To
Both Sides
Floor
Metal Safety Strips
Hearth
Extension Hearth
Extension
1/2" (13 mm)
Clearance To
Both Sides
Floor
Metal Safety Strips

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
6
FIREPLACE SPECIFICATIONS
Figure 9
Figure 7
Figure 8
If the appliance is to be elevated above floor
level, a solid continuous platform must be
constructed.
The header may rest on the top metal spacers,
but must not be notched to fit around them.
Consult all local codes.
Step 4. Fireplace should be secured to side
framingmembersusingthe full length nailing
tabs at the top and bottom of the fireplace
front face. Use screws, 8d nails or equivalent
fasteners ( see Figure 16 ). This manufac-
tured home model is also provided with floor
brackets used to secure the fireplace to the
floor to prevent shifting in transit.
1 ¹⁄₂"
(38 mm)
1 ¹⁄₂" (38 mm)
Metal
Safety Strip
Blocking Special “Z”
Metal Safety Strip
1 ¹⁄₂" (38 mm)
39"
(991 mm)
22 ³⁄₄"
(578 mm)
35"
(889 mm)
12"
(305 mm)
8 ¹⁄₂"
(216 mm)
15 ¹⁄₂"
(394 mm)
10 ¹⁄₄"
(260 mm)
24"
(610 mm)
35"
(889 mm)
17 ⁷⁄₈"
(454 mm)
6"
(152 mm)
6 ³⁄₈"
(162 mm)
36" (914 mm)
39" (991 mm)
Combustion
Air Inlet
Front View
Accessory Access End View Opposing End View
Top View
24"
(610 mm)
12 ¹⁄₂"
(317 mm)
12 ¹⁄₂"
(317 mm)
40 ¹⁄₈"
(1019 mm)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 7
FRAMING SPECIFICATIONSFRAMING WALL VARIATIONS
As many as six (6) different framed wall con-
figurations can be constructed to enclose the
BM36ST fireplace. The following illustrations
depict these variations of wall enclosures. Sev-
eral of these designs may incorporate book
shelves, wood storage boxes, etc.
Parallel Walls
“Y” Type Walls
“H” Type Walls
“L” Type Walls
“C” Type Walls
(Island)
“T” Type Walls
Figure 10
Figure 11
Figure 13
Front View
End View
Figure 12
Figure 14
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 15
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)
* Perpendicular to Roof Ridge.
A
B
Ceiling Framing
C
D
Roof Framing
12" Min.
(305 mm)
22 ³⁄₄"
(558 mm)
38 ¹⁄₄"
(972 mm)
2 x 4 Or 4 x 4
Header
35"
(889 mm)
35"
(889 mm)
35"
(889 mm)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
8
Figure 16
Note: The nailing tabs and the area directly
behind the nailing tabs are exempt from the
clearances described on page 5. Maintain at
least1/2" clearance from thefireboxwrapper to
the framing at the closest point of contact,
directly adjacent to the flange.
Installing The Combustion Air Kit
Step 5. Remove one of the knockouts from the
side of the fireplace. Attach the 6" (152 mm)
collar from the FOAK-6W chimney air kit to the
transition, using the four (4) No. 8 x ¹⁄₂" screws
provided ( Figure 17 ).
Figure 18
Step 3. Position appropriate thimble/firestop
spacer at ceiling and nail temporarily with two
(2) 8d nails or equivalent fasteners ( refer to
Figures 20, 21 and 22 ). Use one fastener on
opposite sides to hold thimble/firestop spacer
in position. Nail permanently, using at least
two (2) more fasteners, after chimney sec-
tions have been assembled through the
thimble/firestop spacer and after any neces-
saryadjustmentshavebeenmade.Thefirestop
spacer must be secured by at least four (4)
fasteners when completely installed.
Note: If there is a room above ceiling level,
firestop spacer must be installed on the bot-
tom side of the ceiling. If an attic is above
ceilinglevel,firestop thimble must be installed
on bottom side of ceiling joist (Figures 19 and
20 ). Do not use adjustable thimble/firestop
between floors.
Figure 19
Firestop Spacer
Room Above
Nailing Flange
Framing
Stud
Screw, 8d
Nail Or
Equivalent
Fastener
Note: If the fireplace is installed against an
inside wall, the Class 0 or Class 1 air duct may
be extended into a ventilated attic space at
least 18" (457 mm) above the attic floor. Se-
cure 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. Cutorframe ahole throughtheoutside
wall for the installation of the duct inlet hood.
A 6 ¹⁄₂" (151 mm) diameter hole is sufficient.
Feed the loose end of the flexible air duct
through the hole cut for the inlet hood and
attach to collar on inlet hood using the tie strip
provided. Insert hood into opening. Secure in
place with the No. 8 x 1 ¹⁄₂" screws provided or
with nails driven through holes in hood flange.
Seal with noncombustible waterproof silicon
type caulking. If additional air duct is needed,
use a Class 0 or Class 1 duct.
INSTALLING THE CHIMNEY SYSTEM
Step 1. Before continuing, check the operation
of the damper, as described on page 4, ( refer to
Figure 2 ).
Step 2. Using standard construction framing
techniques,constructopeningforchimneyroute
upthroughtheceiling(s)androoforthroughan
outside chase.
Framing must maintain adequate minimum air
space clearance at all times.
CAUTION: ALLOW MINIMUM 2" CHIMNEY
AIRSPACETOCOMBUSTIBLEFRAMINGMEM-
BERS THROUGHOUT VERTICAL OR OFFSET
CHIMNEY INSTALLATION.
A minimum 2" air space must be reserved for
all combustible materials extending for any
continuous length surrounding the chimney.
Reference Figures 14 and 15 and charts Fram-
ing Dimensions for Ceiling and Roof, which
specify minimum ceiling and roof dimensions.
In new construction, to determine chimney cen-
terline,useplumblinefromrooforceilingabove
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 18 ). Then plumb from ceiling or
roof level directly above hole which has just
been completed.
Figure 17
Step 6. Connect the 6" (152 mm) Class 0 or
Class 1 air duct to the collar (just mounted)
with the tie strip provided in the hardware kit.
Step 7. Route the Class 0 or Class 1 air duct
outthebackorsidewall,upthroughtheceiling
or floor joists to an outside wall. The air duct
should be located above snow level.
Plumb Line
Figure 20
Firestop Thimble
Attic Above
2”
Clearance
Minimum
Combustion
Air Kit

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 9
Ensurethethimblepenetrates theroof opening.
The thimble must extend completely through
the ceiling or roof cavity to the outermost plane
of the roof. Note: Thimble extensions (F8-
TE26) are available from your distributor for
constructions in which the distance between
the outside of the roof and the inside of the
ceiling exceeds 13". The thimble provides for
zero clearances to combustibles and must be
used at the ceiling/roof in manufactured homes
with double wall chimney (
Figures 21 and 22 ).
Figure 21
Step 4. Note: Chimney sections are con-
structed with a unique locking tab design,
which ensures an immediate, tight assembly
between sections. Plan your chimney require-
mentscarefullybeforeassemblyaschimney is
difficult to disassemble after installation. If
disassembled, the tabs might become dam-
aged. Be certain tabs are properly formed to
ensure locking tabs engage properly.
The FTF8 chimney system is a two piece chim-
ney, which snap together from the fireplace up.
Start with the inner flue section with the lanced
end up, snap lock it in to the matching collar on
topofthe fireplace. At all subsequent joints, the
upper flue section fits into the preceding flue
section.Each piece snaps together by meansof
locking tabs (9 locking tabs per joint). Check
each piece by pulling up slightly from the top to
ensure proper 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 23 ).
WARNING: DO NOT ALLOW INSULATING
MATERIALS TO BE BLOWN INTO THE
SPACE INSIDE THE THIMBLE AND THE
CHIMNEY. TO DO SO COULD RESULT IN
A FIRE HAZARD.
Figure 22
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 24 ).
Figure 23
Locking
Tabs
(Lances)
Note: Assembleone component ofchimneyat
a time (inner section first, then outer section
last)beforeproceeding with the next complete
section.
Continueto assemblethechimney upthrough
framed opening. Assemble just enough to
penetrate the roof flashing openings (
Figure
25 ). Maintain 2" minimum air space to insu-
lationandbuildingmaterials andalways check
each chimney joint (inner and outer) to en-
sureproperengagement. Checkverticalalign-
ment of chimney so that it projects from the
roof in true vertical position.
Figure 24
Note: Trim Thimble/
Extension To Desired Length
And Pitch At The Rood Line
14" Min.
Pitched Roof
Pitched Roof
Bow Roof
14" Min.
Outer Pipe Of
Chimney
Outer Pipe Of
Chimney
Outer Pipe Of
Chimney
14" Min.
Thimble
F8-FSTAE-2
13"
Thimble
F8-FSTAE-2
Thimble
F8-FSTAE-2
Thimble
Extension
F8-TE26
Thimble Cathedral
Ceiling
14" Min.
Outer Pipe Of
Chimney
Use Adjustable Thimble
F8-FSTAE-2 For All
Ceiling Piches, From
Flat To 3/12 Pitch.
Figure 25
FireCraft chimney sections do not need to be
screwed together. Additional reinforcement is
not necessary except in certain offset condi-
tions (refer to page 13, Figure 36 ).
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 FTF8-S4 stabilizer in-
stalled at 30' intervals.
Note: The Model FTF8-S4 adds 3" 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-
lizer section into place over the outer chim-
ney pipe. Position for proper clearance
through framed opening and nail straps se-
curely (under tension in “shear”) into place
on framing. Use 8d nails. Attach successive
lengths of chimney pipe directly to stabilizer
using same techniques as described in Step
4 ( see Figure 26 ).

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
10
Figure 29
Step 9. FTF locking bands, Model FLB, may be
required if the chimney extends too high above
the roof flashing. As a general rule, if the chim-
ney extends more than 6' above the roof flash-
ing, the use of locking bands is advisable to
strengthen the chimney assembly. Align the
locking band at the chimney joint. Locking
bandswraparoundpipejoints equally covering
the joints of both pipe sections. Use the nut
provided and TIGHTEN snugly. Do not over-
tighten as this might damage the chimney
section (
refer to Figure 24 ).
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 30 ). Guy wires are not
supplied by the manufacturer.
Roof Ridge
120°
Figure 30
Locking Band
Mastic
Or Roof
Caulking
Next,slideroofflashingoverextendedchimney
sectionthatpreviouslyhasbeeninstalledabove
the roof opening in Step 4. F8 flashings require
flashing spacers. Slide flashing all the way
down until the flashing base rests flat on the
roof ( Figure 27 ). Again, check the vertical
position of the chimney and the 2" minimum air
space to combustibles.
Figure 27
Note: Do not caulk or seal the ventilating
openings.
Step 7. Secure flashing by nailing along the
perimeter into roof using 8d nails or equivalent
fasteners. 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
fastener heads with roof caulking ( Figure 28 ).
Roof Pitch Model
Flat to 6/12 F8F6
6/12 to 12/12 F8F12
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.
Step 6. Select the proper FireCraft roof flash-
ing based on pitch of roof. Use chart below for
selection:
Figure 28
Step 8. The standard FireCraft Technologies'
FTF8 roof flashing assemblies include a storm
collar. Slide the storm collar over outer chim-
ney,restonflashing spacersand alignwithtop
surface of flashing. Insert tab in slot, pull tight
and bend 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
completely against water penetration (
Figure
29
). Check all joints very carefully to ensure
no water intrusion can take place.
Step 10. Using a CTD Termination:
1. Hold the CTD over top of last chimney
section (
Figure 31 ).
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.
CTD
Termination
Chimney
Figure 31
Note: It is recommended that all exterior ex-
posed related metal fireplace components,
such as terminations, flashings, storm collars
and/or flue be painted with a premium-quality,
high-temperature, rust-preventative paint de-
signed for metal. This is especially important
when installations are made in abnormally
adverse or corrosive environments; such as
near lakes, oceans or in areas with consis-
tently high humidity. Consult the paint manu-
factures instructions for proper preparation
and application.
FTF8-S4 Stabilizer
Figure 26
FTF8 Chimney
F8F6MH
Flashing

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 11
TEN FOOT RULE SUMMARY
The minimum chimney height above the roof
and/orto 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.
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
chimneyedge. 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.
The 2' in 10' rule is necessary in the interest of
safety but does not ensure smoke-free opera-
tion. Trees, buildings, adjoining roof lines,
adverse wind conditions, etc., may require a
taller chimney should the fireplace not draft
properly ( see Figure 32 ).
FTF8 CHIMNEY COMPONENT
CALCULATIONS
The minimum installed height of the BM36ST
fireplacesystem(including fireplaceandchim-
ney components) is 15' (4.6 m). 25' (7.6m)
with two offsets. The maximum system height
is 80' (24.4 m).
To determine the number of chimney sections
and chimney components required, follow
these steps:
Figure 32
Less Than 10'
3'
Min
2' Min.
10' 3'
Min
1. Determine total vertical height of the fire-
placeinstallation.Thisdimensionismeasured
from the surface the fireplace sets on to the
point where smoke exits from the termination.
2. Determine the number of chimney compo-
nents required, except chimney sections. This
would include firestop spacers, stabilizers,
roof flashing, etc.
3. The effective heights of the components are:
BM36ST 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 = 46¹⁄₄" (1175mm)
CTD Termination = 6" (152 mm)
S4 Stabilizer * = 3" (76 mm)*
* Required for every 30' (9.1 m) of vertical
chimney and 10' of offset chimney.
4. Determine amount of chimney height re-
quired by subtracting total combined height of
all pre-selected components (fireplace and
chimneycomponentsfromtotaldesiredheight.)
Reference Vertical Elevation Chart and deter-
minethe number of chimney sections (quantity
and length) required.
F8FS30-2
Firestop Spacer
FTF8-S4 Stabilizer
30°Firestop
And Room Above
10'
Max.
Room Above
2" Min.
Air Space
2" Min.
Air Space
Figure 33
A 30°offset elbow, angling in any direction,
may be the first component used off the top of
the fireplace flue collar. The offset and return
elbowsmaybeattachedtogether,orasectionor
sections of chimney may be used between, but
donotexceed20'intotallengthbetweenelbows.
If sections of pipe exceed 10' between elbows, a
chimney stabilizer must be used at the midpoint
( see Figure 34 ).
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 chim-
ney used between elbows cannot exceed 20'
( see Figure 35 ). Example: If C1= 10' then C2
cannot exceed 10'.
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 36 ).
SPECIAL OFFSET INSTRUCTIONS
Chimney 30°Offset through Floor or Ceiling
It may be necessary to assemble the chimney
at 30°when passing through the floor or
ceiling area. Use the F8FS30-2 firestop spacer
as shown in Figure 33 .
Support the chimney at floor or ceiling pen-
etration with a FTF8 stabilizer if distance of
chimney below ceiling is 10' or more. Main-
tain 2" minimum air space to combustibles
from chimney sections. The chimney must
pass vertically through the attic space.

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
12
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
FTF8 VERTICAL ELEVATION CHART
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
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 37 ). Be sure to drill only through the
outer chimney casting. Do not puncture the
inner flue.
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'.
Return elbow support straps must be securely
attached under tension (in shear) to structural
framing members above. Do not substitute a
FTF8-30 offset elbow in place of a FTF8-E30
return elbow.
Figure 34
Stabilizer
A
1
20'
Max.
B
1
10' Max.
Offset
Elbow
Return
Elbow
OFFSET CALCULATIONS
Step 1. Use Offset Chart to determine amount
of horizontal offset (A) and height (B) for
various chimney section assemblies.
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.
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 19 and 20 and
stabilizers as shown in
Figure 26 .

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 13
Figure 35
A1
C1
B1
B2
C2
A2
A1
C1
B1
B2
C2
A2
Figure 36
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'
A B FTF8-ES30 Number of 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 140010542045
43 ¹⁄₄ 83 ³⁄₄ 1 0 102010992127
44 ¹⁄₄ 85 ¹⁄₄ 1 0 001111242165
45 ¹⁄₄ 87 ¹⁄₂ 1 0 031011492223
46 ¹⁄₄ 89 1 0 012011752261
48 ¹⁄₄ 91 ¹⁄₂ 1 0 202012262324
49 ¹⁄₄ 94 ¹⁄₄ 1 0 101112512394
50 ¹⁄₄ 95 ³⁄₄ 1 0 000212762432
51 ¹⁄₄ 97 ³⁄₄ 1 0 112013022483
54 ¹⁄₄ 103 1 0 0 2 2 0 1378 2616
55 ¹⁄₄ 104 ¹⁄₂ 1 0 100214032654
56 ¹⁄₂ 106 ¹⁄₂ 1 0 212014352705
58 ¹⁄₄ 109 ³⁄₄ 1 0 010214802788
62 ¹⁄₂ 116 ³⁄₄ 1 1 103015882965
65 ¹⁄₂ 122 1 1 0 1 3 0 1664 3099
67 ³⁄₄ 125 ¹⁄₂ 1 1 203017213188
69 ¹⁄₂ 128 ³⁄₄ 1 1 001217653270
70 ³⁄₄ 130 ³⁄₄ 1 1 113017973321
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 104020263715
80 ³⁄₄ 148 1 1 1 0 0 3 2051 3759
82 ³⁄₄ 151 ¹⁄₂ 1 1 014021023848
83 ¹⁄₂ 153 1 1 0 1 0 3 2121 3886
FTF8 OFFSET ELEVATION CHART
Figure 37
Underside Of Chimney
Figure 38
Chimney Section (S)
FTF8-E30 Return Elbow*
FTF8-30 Offset Elbow* B
A
*Part of Offset/Return Package Model FTF8-ES30

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
14
INSTALLING OFFSETS
First, review the Offset Elevation Chart and see
Figure 38 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
ceiling, first determine the center point for a
vertical chimney following the instructions for
vertical installation.
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
show the center point for your offset ceiling
cut.
Step 2. Proceed by using the Straight Up
Installation Instructions for cutting and fram-
ing ceiling 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, 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.
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. Center inner slip section into inner flue
pipe-slip down.
Step 3. Centerouter-locking section over outer
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 39 ).
If additional length of duct is necessary, pur-
chaselocallyavailableClass0orClass1ducting.
The duct may extend up to 50' (15.2 m) in any
direction.
Outside combustion air may be run upwards or
verticallythroughframingandceilingjoists,with
thehoodinstalledthroughanoutsidewalland 3'
(914 mm) below the termination. Ducting 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
WHERE IT COULD BE BLOCKED BY SHRUBS,
SNOW DRIFTS, ETC. NEVER LOCATE THE AIR
INLETINGARAGEORANYAREAWHERETHERE
IS ANOTHER FUEL BURNING APPLIANCE OR
PRODUCTS EMITTING COMBUSTIBLE GASES
SUCH AS PAINT, GASOLINE, ETC. IN COLD
CLIMATES, IT IS RECOMMENDED THAT THE
COMBUSTION AIR 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).
After completing the installation of the com-
bustion air vent system the actuator arm must
be put in service and tested to ensure proper
operation before completing any enclosure
around the firebox. Failure to do so may result
in extensive and costly rework.
Locate the actuator arm along the right side of
theappliance firebox opening and see
Figure41 .
To operate, pull the actuator forward to open
the combustion air door, and push it back to
close. Operate the actuator through several
cyclesensuringproperoperationandfreedom
of movement. Return the actuator arm to the
closed position.
WARNING: THESE FIREPLACES SHOULD
BE OPERATED ONLY WITH THE DOORS
FULLY CLOSED.
Figure 39
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.
Figure 41
Combustion Air Kit Operation
Use combustion air kit, Model FOAK-6 or
FOAK-6W, with these fireplace systems. Refer
to the installation instructions packed with the
airkitforspecificinformation.Outsideairdrawn
into the fireplace supplies air to the fire for
combustion. The outside air kit must be in-
stalled before the fireplace is framed and en-
closed in the finished walls ( refer to Steps 5
thru 8, and Figure 17 on page 8 ).
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
openwhen the fireplace is inoperationandfully
closed when the fireplace is not in use to
prevent outside air from entering your home.
Return
Elbow
Pull To
Open
Push To
Close
Figure 40

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 15
Gas Line Connection
Install only a ¹⁄₂" black iron pipe through fire-
place wall for connection to a decorative gas
appliance inside the firebox. Outside, the iron
pipe 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.
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.
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 requirements for Gas-Fired Log Lighters
forWoodBurningFireplaces, DraftNo.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.
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.
Ifremoval is attempted from theouterwrapper,
side refractory damage may occur. With a me-
dium-sized hammer, lightly tap the surface of
the indentation. The refractory material is very
thin in this area and is easily removed. Once a
small hole has been made, continue tapping
until you have reached sufficient diameter for
the gas line to fit through. The entire knockout
does not have to be removed. Remove insula-
tion in the gas line channel.
IMPORTANT:REPACKINSULATIONMATERIAL
IN SQUARE HOLE AROUND GAS LINE, INTE-
RIORANDEXTERIOROFFIREPLACE,TOSEAL.
Glass Doors
Glass doors have been installed on these fire-
places as standard equipment. Shipping and
transit may have moved them out of alignment.
The doors are properly adjusted when the top
door trim is in a straight, level line and the gap
between the doors is even at the top and
bottom. If adjustments are required, grasp the
door handle and loosen the lower door pivot
pin using a ³⁄₈" open end wrench*. Slide the
door panel on the hinge pin until the gap
between the upper door trim and upper frame
is even. Retighten the lower door pivot pin*.
Repeat this procedure for the opposite door if
needed (
Figure 42 ).
Figure 43
CAUTION: WHEN USING THE DECORATIVE
GAS APPLIANCE, THE FIREPLACE DAMPER
MUST BE SET IN THE FULLY OPEN POSITION.
CAUTION:PLUMBINGCONNECTIONSSHOULD
ONLY BE PERFORMED BY A QUALIFIED, LI-
CENSEDPLUMBER.MAINGASSUPPLYMUST
BE OFF WHEN PLUMBING GAS LINE TO FIRE-
PLACE OR PERFORMING SERVICE.
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.
Usenoncombustiblecaulkingmaterialonlyon
fireplace facing to seal. Also, the outside air
inlet duct should be wrapped with noncom-
bustible insulation to minimize the formation
of condensation. Do not place insulation ma-
terials on top of fireplace or against chimney
sections.
Note:A 2"(51mm) air space must bepreserved
for all combustible materials extending for any
continuous length adjacent to the chimney.
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.
FIREPLACE FINISHES
Mantels and Trim
Combustible mantels and trim may be installed
12" (305mm) above the 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 the requirements as long as it does not
interfere with the operation of glass doors.
COLD CLIMATE INSULATION
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.
Surrounding materials must be caulked where
it meets the black metal facing of the fireplace
to avoid cold air intrusion.
Figure 42
Pivot Pin Roller
Pin
Upper Door
Guide Track
Spring Clip
Hearth Extensions and Wall Shields
A hearth extension must be installed with all
fireplaces. Its purpose is twofold. It protects a
combustible floor in front of the fireplace from
both radiant heat and sparks and it distin-
guishes the prescribed hearth extension area
from other non-protected surfaces.
12"
(305 mm)
Min.
9 ¹⁄₂"
(241 mm)
Finished Wall
Spacer
Combustible
Mantel
and Trim
8"
(203 mm)
Max.
Typical Installation
1 ¹⁄₂"
(38 mm)
Fireplace Opening

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
16
At times it is important to know what combina-
tion of materials are acceptable for use as
hearth extensions. The “R values” are used to
determine acceptable combinations of materi-
als because “R values” are additive where r and
k values are not.
Alternative Hearth Extension
and Wall Shield Materials
Listed Values Min. Thick
Material k r TL
Millboard .84 1.19 1"
Alternative Values Min. Thick
Materials k r TM
Wonderboard 1.92 0.56 2 ¹⁄₄"
Common brick 5.00 0.20 6"
Cement mortar 5.00 0.20 6"
Ceramic tile 12.5 0.08 14 ⁷⁄₈"
Marble 11.0 0.09 13 ¹⁄₈"
Micore CV230 0.43 2.33 ¹⁄₂"
(U.S. Gypsum)
Ceraform 126 0.27 3.70 ³⁄₈"
(Johns-Manville)
Using the r formula:
Desired r value of listed Min.thickness
Required = material (per inch)x of Listed
Thickness r value of desired Material
material (per inch)
TM(inches) = 1.19 x TL
rM
TM(inches) = 1.19 x 1"
2.33*
Answer using r = 0.51 x 1" = .051 = ¹⁄₂"
¹⁄₂" thickness Micore will be required.
Example: Given that the required “R value” for
a suitable hearth extension used must be equal
to or greater than:
“R” = r x TL = 1.19 x 1" = 1.19.
If it is desired to elevate a marble hearth exten-
sion to a level of 5" or more above the floor
surface. What combination of noncombustible
materials can be used to accomplish this?
If common brick is used so that the 3 ¹⁄₂"
dimension is the height, “R” for the common
brick becomes:
“R”M = r x TM= 0.20 x 3 ¹⁄₂" = .70
Using ¹⁄₂" of mortar to set the brick, “R” for the
mortar is calculated as follows:
“R”M = r x TM = 0.20 x ¹⁄₂" = .10
*value taken from chart
MethodsofDeterminingHearthExtension
and Wall Shield Equivalents
To determine the thickness required for any
material when either the k or r values are
known:
TM= Thickness of material in inches
kM= K value of desired material
rM= R value of desired material
TL= Minimum listed thickness
Example: Micore CV230 is to be used for the
hearthextension fireplace. How thick must this
material be?
Using the k formula:
Desired k value of desired Min.thickness
Required = material (per inch) x of Listed
Thickness k value of listed Material
material (per inch)
TM (inches) = kMx TL
.84
TM (inches) = 0.43* x 1"
0.84
Answer using k = 0.51 x 1" = 0.51 = ¹⁄₂"
¹⁄₂" thickness Micore will be required.
“R value” = 1 = r x thickness of material used
k
The hearth extension must extend beyond
both of the BM36ST fireplace side openings.
Use a hearth extension constructed of a du-
rablenoncombustiblematerial havinganequal
or greater insulating value of k=.84 BTU IN/FT2
HR °F or a thermal resistance that equals or
exceeds r=1.19 HR °F FT2/BTU IN. A minimum
³⁄₈" (10 mm) thick noncombustible material is
all that is required over a noncombustible or
slab floor (
Figure 44 ).
Secure the hearth extension to the floor to
prevent possible shifting.
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 5 and 6 ).
If fireplace is installed diagonally across a 90°
corner; no wall shields are required.
Hearth Extension Dimensions
A16" (406 mm)
B26" (660 mm)
C8" (203 mm)
D42" (1067 mm)
Figure 45
Note: Any noncombustible material whose k
value is less than .84 or whose r value is more
than 1.19 is acceptable.
Figure 44
BA
C
C
12" (305 mm) Min.
to Fireplace Opening
Side Wall
D
A
B
D
CC

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 17
FINISH TO YOUR TASTE
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.
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.
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 .
Figure 47
This would not be an acceptable combination
of material for the hearth extension since the
totalcalculated “R value” of thematerialsused
is under the required “R value” of 1.19. An
additional layer of insulating materials must
be used.
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.
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 46 ).
Figure 46
Secure the hearth extension to the floor to
prevent possible shifting.
Combination
Offset/Return Elbow 63L28 FTF8-OR15
INSTALLATION COMPONENTS
The following items are available for use in the
installation of this appliance.
Thimble Extension 2" 19M52 F8-TE26-2
Shipping Weight 215 lbs.
Firestop Spacer (30°) 63L32 F8FS30-2
Firestop Spacer (Flat) 63L31 F8FS-2
Max. Thickness Of Hearth Extension
When Fireplace Is On The Floor
5-3/4" Max.
(146 mm)
63L10 FTF8-12
63L13 FTF8-18
63L14 FTF8-36
Chimney Section 63L15 FTF8-48
19M55 F8F6MM
Flashing 19M56 F8F12MM
A ³⁄₄" marble slab set in ¹⁄₂" mortar covers the
brick, “R” for the marble and mortar becomes:
“R”M= r x TM= 0.09 x ³⁄₄" = .068
“R”M= r x TM= 0.20 x ¹⁄₂" = .10
The sum of all “R values” is:
.70 + .10 +. 068 + .10 = .968
12"
(305 mm)
45˚
Combustible
Materials Allowed
in Shaded Area
1" (25 mm)
12"
(305 mm)

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
18
INSTALLATION COMPONENTS
Storm Collar 63L59 FSC
Stabilizer 63L25 FTF8-S4
Offset/ Return
Package (30°) 63L22 FTF8-ES30 Round Termination 63L42 FTF8-CTD
Firestop/Thimble 19M20 F8-FSTAE-2
Chimney Pipe Kits 19M18 F8-MHPK3
Locking Band 63L60 FLB

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE. 19

NOTE: DIAGRAMS & ILLUSTRATIONS NOT TO SCALE.
20
Printed in U.S.A. © 2001 by LHP
P/N 800,020M REV. N/C 05/2001
LHP
4325 Artesia Avenue • Fullerton, CA 92833
714-521-7302
The manufacturer reserves the right to make changes at any time, without notice, in design, materials, specifications, prices and also to discontinue colors, styles and products.
Consult your local distributor for fireplace code information.