Heatilator traditional T4800 Manual

12-01 1 34922 Rev B
WARNING!
Improper installation, adjustment, alteration, service or maintenance can cause injury or property
damage. Refer to this manual. For assistance or additional information, consult a ualified installer,
service agency or the gas supplier.
TRADITIONAL T4800
WOODBURNING FIREPLACE
INSTALLATION & OPERATING
INSTRUCTIONS

34922 Rev B 2 12-01
T4800 INSTALLATION INSTRUCTIONS
CAUTION:
Do not expose the fireplace to the elements (i.e. rain, etc.) and keep the fireplace dry at all times. Wet insulation
will produce an odor when the fireplace is used.
Table of Contents
Design and Installation Considerations ........................................................................................... 3
A. Listings and Code Approvals........................................................................................................... 4
B. Description of the Fireplace System ............................................................................................... 4
C. System Components ...................................................................................................................... 5
D. re-Installation reparation ............................................................................................................. 9
E. Chimney Requirements ................................................................................................................ 11
F. Installation of Fireplace ................................................................................................................. 13
G. Constructing a Chase ................................................................................................................... 20
H. Operating Instructions .................................................................................................................. 22
I. Maintenance Instructions ............................................................................................................. 26
Index ............................................................................................................................................ 27
Limited Warranty .......................................................................................................................... 28
SAFETY PRECAUTIONS
1. Please read these installation instructions completely
before beginning installation procedures. Failure to
follow them could cause a fireplace malfunction
resulting in serious injury and/or property damage.
2. Always check your local building codes prior to
installation. The fireplace installation must comply
with all local, regional, state and national codes and
regulations.
3. An adequate supply of replacement combustion air
from outside the house must be a ailable to the fire
for the fireplace to operate properly. To achie e this,
the use of the optional outside air kit is highly
recommended.
In the e ent the home is unusually tightly sealed, the
optional combustion air kit may not pro ide all the air
required to support combustion. Hearth Technologies
Inc. 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 pro ided for the fireplace.
4. This fireplace must be installed with the Hearth
Technologies Inc. (HTI) SL Series Chimney System.
The chimney system must always terminate outside
the building. Be sure to follow all chimney
specifications gi en in these installation instructions.
. NEVER lea e children unattended when there is a fire
burning in the fireplace.
6. This woodburning fireplace is built for solid fuel only.
NEVER use gasoline, gasoline type lantern fuel,
kerosene, charcoal lighter fluid, or similar liquids in
this fireplace. Keep any flammable liquids a safe
distance from the fireplace.
7. DO NOT use chimney cleaners or flame colorants in
your fireplace.
8. The flue damper must be open at all times when the
fireplace is in use.
9. While ser icing this fireplace, always shut off any
electricity or gas to the fireplace. This will pre ent
possible electric shock or burns. Also, make sure the
fireplace is completely cooled before ser icing.
10. To ensure a safe fireplace system and to pre ent the
build up of soot and creosote, inspect and clean the
fireplace and chimney prior to use and periodically
during the burning season. See page 26 for cleaning
instructions.

12-01 3 34922 Rev B
T4800 INSTALLATION INSTRUCTIONS
DESIGN AND INSTALLATION CONSIDERATIONS
When selecting a location for your woodburning fireplace, it is important to e aluate a number of considerations. Modern
construction techniques can create conditions that may not allow your chimney to draft properly. This may result in
smoke spillage from your fireplace, as well as cause other combustion appliances to operate incorrectly.
Tightly sealed construction is important for energy efficiency. Unfortunately, a great deal of effort has been directed to
tightening up sidewall construction, while considerably less attention has been paid to tightening upper portions of the
warm air en elope (insulated ceilings). This has increased the Stack Effect, a condition that increases the negati e
pressure generated by the structure. This negati e pressure will directly affect the drafting performance of a fireplace
chimney. To minimize the negati e pressure generated by stack effect, make certain that all ductwork installed in the
attic spaces is sealed airtight. Minimize the number of recessed light fixtures installed in the insulated ceiling, and use
sealed recessed light fixtures. Finally, make certain the whole house fans and attic access panels are tightly sealed.
These are important design considerations that must be obser ed during the design and construction stage of the
home.
If you desire to put a fireplace in your basement, we recommend that you consider a direct ent gas fireplace. Basements
always ha e a significant negati e air pressure that causes the fireplace system to be more susceptible to smoke
spillage and cold flue backdrafting. Since direct ent gas fireplaces are sealed, they are not affected by the negati e
pressure that exists in basements.
Finally, woodburning fireplaces perform best when their chimney (roof termination) is located on the upper half of the
roof, especially when cathedral ceilings are present. Chimneys that are located on the lower half of the roof realize what
is known as lazy flue and will not draft as well as a chimney that is located in the upper portion of the roof. The reason
for this is that the stack effect generated by the o erall height of the li ing spaces inside the house will exceed the draft
generated by the chimney system. If you desire to place a woodburning fireplace in a location where the termination cap
would be located on the lower half of a roof, such as on an outside wall at the base of a cathedral ceiling, we recommend
that you consider using a direct ent gas fireplace. This will assure the homeowner a fireplace that operates correctly.
These properties do not affect just your woodburning factory-built fireplace. They can cause any woodburning fireplace
as well as any con entionally ented (B- ent) gas appliance to operate improperly. Careful planning at this stage of your
project will ensure satisfaction with the operation of your fireplace once it is completed.

34922 Rev B 4 12-01
T4800 INSTALLATION INSTRUCTIONS
WARNING!
This fireplace and its components are designed to be installed and operated as a system. Any alteration to or
substitution for items in this system, unless allowed by these installation instructions, will void the Underwrit-
ers Laboratories listing and may void the product warranty. It may also create a hazardous installation. Read
through these instructions thoroughly before starting your installation and follow them carefully throughout
your project.
1. The Heatilator fireplace system consists of the following:
a. Fireplace/Integral Grate/Outside Combustion Air System
b. Refractory
c. Chimney Termination Cap
d. Chimney System
e. Hearth Extension
2. Optional Components Include:
a. Glass Doors
b. Chimney Air Kit
NOTE: Illustrations used throughout these instructions
reflect typical installations and are for design pur-
poses only. Actual installation may ary slightly due to
indi idual design preferences. Howe er, minimum and
maximum clearances must be maintained at all times.
The illustrations and diagrams used throughout these
installations instructions are not drawn to scale.
Figure 1 - Typical Fireplace System
B. DESCRIPTION OF THE FIREPLACE SYSTEM
This fireplace system has been tested and listed in
accordance with UL 127 standards, and has been listed
by Underwriters Laboratories Inc. for installation and
operation in the United States as described in this manual.
This fireplace has been tested and listed for use with the
optional components listed on page 5. These optional
components may be purchased separately and installed
at a later date. Howe er, installation of an outside air kit
will require significant reconstruction, and should be
installed at the time of the initial fireplace installation.
Check with your local building code agency prior to
installing this fireplace to ensure compliance with local
codes, including the need for permits and follow-up
inspections. If you need assistance during installation,
please contact your local dealer or the Heatilator Technical
Ser ices Department, Hearth Technologies Inc., 1915 W.
Saunders St., Mt. Pleasant, Iowa 52641 (1-800-843-2848).
Heatilator® is a registered trademark of Hearth
Technologies Inc., Di ision, HON INDUSTRIES.
A. LISTINGS AND CODE APPROVALS

12-01 5 34922 Rev B
T4800 INSTALLATION INSTRUCTIONS
C. SYSTEM COMPONENTS
1. Fireplace Components
Fireplace Dimensions
Perception Glass Doors
DP1348
DP1348B
DP1348S
Bi-Fold Glass Doors
DM1348
DM1348B
DM1348S
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HX4 - Hearth Extension
GR14 Integral Grate

34922 Rev B 6 12-01
T4800 INSTALLATION INSTRUCTIONS
2. Chimne Components
The following pictures show only those chimney components which may be safely used with this fireplace.
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AK14 - Outside Air Kit

12-01 7 34922 Rev B
T4800 INSTALLATION INSTRUCTIONS
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SL11 - Chimney Stabilizer SL1130 - Offset/Return
RF 70 - Roof Flashing
Flat to 6/12 Pitch
RF 71 - Roof Flashing
6/12 to 12/12 Pitch
CB 76
Chimney Bracket
JB 77
Joint Band
AS10
Straight Attic
Insulation Shield
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Chimney Sections
Firestop Spacer

34922 Rev B 8 12-01
T4800 INSTALLATION INSTRUCTIONS
LDS33 (3 x 3)
LDS46 (4 x 6)
Decorative Shroud
TR11
Round
Termination Cap TR11T
Round Telescoping
Termination Cap
ST117
Square
Termination Cap
CT 6
Chase Top CAK A
Chimney Air Kit

12-01 9 34922 Rev B
T4800 INSTALLATION INSTRUCTIONS
Figure 4
Corner Installation
WARNING!
Do not draw outside air from garage spaces. Exhaust products of gasoline engines are hazardous.
Do not install outside air ducts such that the air may be drawn from attic spaces, basements or above the
roofing where other heating appliances or fans and chimneys exhaust or utilize air. These precautions will
reduce the possibility of fireplace smoking or air flow reversal.
WARNING!
To prevent contact with sagging or loose insulation, the fireplace must not be installed against vapor barriers
or exposed insulation. Localized overheating could occur and a fire could result.
These are
rough
framing
dimensions
only.
Figure 2 - Fireplace Locations
CLEARANCES!
A minimum 1½ air clear-
ance must be maintained at
the back and sides of the
fireplace assembly except at
the nailing flange where the
clearance is ½.
Chimney sections at any level
require a 2 minimum air
space clearance between the
framing and chimney section.
Figure 3
Installation Along a Wall or an Exterior Chase
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D. PRE-INSTALLATION PREPARATION
1. Fireplace Locations and Space Requirements
Se eral options are a ailable to you when choosing a location for your fireplace. This fireplace may be used as a
room di ider, installed along a wall, across a corner or used in an exterior chase. See Figure 2.
Locating the fireplace in a basement, near frequently opened doors, central heat outlets or returns, or other locations
of considerable air mo ement can affect the performance and cause intermittent smoke spillage from the front of
the fireplace. Consideration should be gi en to these factors before deciding on a location.
Figures 3 and 4 show two typical installations assuming an outside air kit is being used. Therefore, an allowance
must be made for 90° bends. Less space is required when ducting goes directly outside without forming elbows.

34922 Rev B 10 12-01
T4800 INSTALLATION INSTRUCTIONS
Figure - Framing the Fireplace
WARNING!
Do not apply combustible finishing materials over any part of the black face of this fireplace or a structure
fire may result. The black metal fireplace front may only be covered with noncombustible materials such
as ceramic tile, brick, or stone. Do not cover or block any cooling air slots. Do not cover any portion of the
opening to the fireplace that would prevent the installation of an authorized glass door.
Figure 6 - Sidewalls and Surrounds
2. Framing the Fireplace
The T4800 fireplace will fit a framed opening of 567/8 wide x 493/8 tall. The finished ca ity depth must be no less
than 305/8.
Figure 5 shows a typical framing (using 2 x 4 lumber) of the fireplace, assuming combustible materials are used.
All required clearances to combustibles around the fireplace must be adhered to. Any framing across the top of the
fireplace must be abo e the le el of the top standoffs. Chimney sections at any level require a 2 minimum air
space clearance between the framing and chimney section.
3. Sidewalls/Surrounds
Adjacent combustible side walls must be located a minimum of 24 from the fireplace opening. See Figure 6. If you
are using a decorati e surround constructed of combustible material, it must be located within the shaded area
defined in Figure 6. Short stub walls are also acceptable if they are contained within the shaded area.
CLEARANCES!
A minimum 1½ air clearance
must be maintained at the
back and sides of the
fireplace assembly except at
the nailing flange where the
clearance is ½.
Chimney sections at any level
require a 2 minimum air
space clearance between the
framing and chimney section.

12-01 11 34922 Rev B
T4800 INSTALLATION INSTRUCTIONS
E. CHIMNEY REQUIREMENTS
When planning your fireplace location, the chimney construction and necessary clearances must be considered. The
fireplace system and chimney components ha e been tested to pro ide flexibility in construction. The following figures
are the minimum distances from the base of the fireplace.
1. Minimum o erall straight height 18 ft.
2. Minimum height with offset/return 18.5 ft.
3. Maximum height 90 ft.
4. Maximum chimney length between an offset and return 20 ft.
5. Maximum distance between chimney stabilizers 35 ft.
6. Double offset/return minimum height 24 ft.
7. Maximum unsupported chimney length between the offset and return 6 ft.
8. Maximum straight unsupported chimney height abo e the fireplace 35 ft.
Figure 7 - Chimney Offset/Return
Example: Your A dimension from
Figure 7 is 14½. Using Table 1 the
dimension closest to, but not less than
14½ is 145/8 using a 30° offset/return.
It is then determined from the table that
you would need 33 (Dimension B)
between the offset and return. The
chimney components that best fit your
application are two SL1112s.
WARNING!
Do not com-
bine offsets to
create an off-
set greater
than 30° from
vertical. This
may create a
fire hazard
since the natu-
ral draft may
be restricted.
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Offset/Returns Table 1 30° Offset Chart
1. Using Offsets and Returns
a. To bypass any o erhead obstructions, the chimney may be offset using a 30° offset/return (SL1130). Perform
the following steps to determine the correct chimney component combination for your particular installation.
b. An offset and return may be attached together or a chimney section(s) may be used between an offset and
return.
1) Measure how far the chimney needs to be shifted to enable it to a oid the o erhead obstacle. See Figure 7,
dimension A to determine chimney sections required to achie e the needed shift.
2) After determining the offset dimension, refer to Table 1 and find the A dimension closest to but not less
than the distance of shift needed for your installation.
3) The B dimension that coincides with the A dimension represents the required ertical clearance that is
needed to complete the offset and return.
4) Read across the chart and find the number of chimney sections required and the model number of those
particular chimney parts.
) Whene er the chimney penetrates a floor/ceiling, a firestop spacer must be installed.
6) The effecti e height of the fireplace assembly is measured from the base of fireplace to the top of the
starter collar. See Figure 6.

34922 Rev B 12 12-01
T4800 INSTALLATION INSTRUCTIONS
Figure 8 - Chimney Height
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3
/ 4 "
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3
/ 4 "
*Dimensions reflect effective height.
Table 2
3. Number of Sections Required
To determine the chimney components needed to
complete your particular installation, follow the steps
below:
a. Determine the total ertical height of the fireplace
installation. This dimension is measured from
the base of the fireplace assembly to the point
where the smoke exits the termination cap.
b. Subtract the effecti e height of the fireplace
assembly from the o erall height of the fireplace
installation (measured from the base of the
fireplace to the bottom of the termination cap
c. Refer to the chart on the right to determine what
components must be selected to complete the
fireplace installation.
d. Determine the number of firestop spacers, sta-
bilizers, roof flashing, etc. required to complete
the fireplace installation.
2. Chimne Height Requirements (above
roof line)
a. Major building codes specify a minimum chimney
height abo e the roof top. These specifications
are summarized in what is known as the Ten Foot
Rule. This rule states:
If the horizontal distance from the side of the
chimney to the peak of the roof is ten feet or less,
the top of the chimney must be at least two feet
abo e the peak of the roof, but ne er less than
three feet in o erall height abo e the highest point
where it passes through the roof.
If the horizontal distance from the side of the
chimney to the peak of the roof is more than ten
feet, a chimney height reference point is
established on the surface of the roof a distance
of ten feet from the side of the chimney in a
horizontal plane. The top of the chimney must be
at least two feet abo e this reference point, but
ne er less than three feet in height abo e the
highest point where it passes through the roof.
See Figure 8.
b. These chimney heights are necessary in the
interest of safety but do not ensure smoke-free
operation. Trees, buildings, adjoining roof lines,
ad erse wind conditions, etc. may create a need
for a taller chimney should smoking occur.

12-01 13 34922 Rev B
T4800 INSTALLATION INSTRUCTIONS
F. INSTALLATION OF FIREPLACE
WARNING!
Before starting, do the following:
1. Wear gloves and safety glasses for protection.
2. Keep hand tools in good condition. Sharpen cutting edges and make sure tool handles are secure.
3. Always maintain the minimum air space required to the enclosure to prevent fire.
Important: To ensure proper fit of the glass doors,
check the fireplace opening for square. Measure
diagonal distances of the opening to make sure
they are equal. If they are not equal, continue to
shim the fireplace until those diagonals are equal.
Figure 9 - Positioning the Metal Strips
1. Positioning the Fireplace
This fireplace may be placed on either a combustible
or noncombustible continuous flat surface. Follow the
instructions for framing on pages 9 and 10. Slide the
fireplace into position. Be sure to provide the
minimum air clearance at the sides and back of the
fireplace assembly.
2. Placing the Protective Metal Hearth
Strips
Included with your fireplace you will find two metal
hearth strips measuring approximately 28 x 4.
These strips are used to pro ide added protection
where the fireplace and the hearth extension meet.
Slide the metal strip 2 under the front edge of the
fireplace. The indi idual pieces must o erlap each
other by 1 minimum in the middle of the fireplace to
pro ide continuous co erage of the floor. See Figure9.
These metal strips should extend from the front and
sides of the fireplace opening by 2.
3. Leveling the Fireplace
Le el the fireplace side-to-side and front-to-back.
Shim with noncombustible material, such as sheet
metal, as necessary. Secure the fireplace (using the
nailing flanges located on either side of the fireplace)
to the ertical framing.

34922 Rev B 14 12-01
T4800 INSTALLATION INSTRUCTIONS
Figure 11
Installing the Firestop Spacer
CAUTION:
Firestop spacers must be used whenever the
chimney penetrates a ceiling/floor area.
Figure 10
Assembling Chimney
Sections
WARNING!
Carefully follow the instructions for assembly
of the pipe and other parts needed to install this
fireplace system. Failure to do so may result in
a fire, especially if combustibles are too close
to the fireplace or chimney and air spaces are
blocked, preventing the free movement of
cooling air.
4. Assembling Chimne Sections
Attach either a straight chimney section or an offset to
the top of the fireplace (depending on your installation
requirement). Chimney sections are locked together
by pushing downward until the top section meets the
stop bead on the lower section.
The inner flue is placed to the inside of the flue section
below it. The outer casing is placed outside the outer
casing of the chimney section below it. See Figure10.
5. Installing Firestop Spacers
Mark and cut out an opening in the ceiling for the
firestop spacer being utilized (17 x 17 for an FS538,
17 x 26 for an FS540). Frame the opening with the
same dimension lumber used in the ceiling joists.
Install the firestop spacer.
These firestop spacers are designed to pro ide the
minimum 2 air space required around the chimney.
In all situations, the firestop spacers are to be nailed
to the ceiling joists from the bottom or fireplace side,
EXCEPT when the space abo e is an insulated ceiling
or attic space. In this situation, the firestop spacer
must be nailed from the top side to pre ent loose
insulation from falling into the required 2 air space
around the chimney. See Figure 11.

12-01 15 34922 Rev B
T4800 INSTALLATION INSTRUCTIONS
WARNING!
Maintain a minimum of 2 air clearance to all
parts of the chimney system at all times! Fail-
ure to maintain this 2 air clearance will cause
a structure fire.
CAUTION:
Inner flue and outer liner sections cannot be dis-
assembled once locked together. Plan ahead to
ensure the proper installation height is achieved
with the selected chimney components.
Figure 12 - Installing an Insulation Shield
NOTE: You must pro ide support for the pipe dur-
ing construction and check to be sure inad ertent
loading has not dislodged the chimney section
from the fireplace or at any chimney joint.
WARNING!
When chimney sections exceeding six feet in
length are installed between an offset and re-
turn, structural support must be provided to re-
duce off-center loading and prevent chimney
sections from separating at the chimney joints.
Figure 13 - Offset/Return with Stabilizer
6. Attic Insulation Shield
An insulation shield should be installed when there
is a possibility of insulation coming into contact with
the factory built chimney system. The insulation shield
is installed by positioning it o er the ertical chimney
section where it penetrates a firestop spacer. The
firestop spacer will support the insulation shield. See
Figure 12.
7. Double-checking the Chimne
Assembl
Continue assembling the chimney sections up
through the firestop spacers as needed. While doing
so, be aware of the height and unsupported chimney
length limitations that are gi en on page 11 under
Chimney Requirements.
Check each section by pulling up slightly from the top
to ensure proper engagement before installing the
succeeding sections. If they ha e been connected
correctly, they will not disengage when tested.
8. Securing the Chimne S stem
When offsets and returns are joined to straight pipe
sections, they must be locked into position with the
screws pro ided (outer only), using the predrilled
holes. To pre ent gra ity from pulling the chimney
sections apart, the returns and the chimney stabilizers
ha e straps for securing these parts to joists or rafters.
See Figure 13.

34922 Rev B 16 12-01
T4800 INSTALLATION INSTRUCTIONS
Figure 14 - Ceiling/Attic Construction
Figure 1 - Air Kit Handle Location
9. Marking the Exit Point of the Roof
Locate the point where the chimney will exit the roof
by plumbing down to the center of the chimney. Dri e
a nail up through the roof to mark the center. See
Figure14.
10.Cutting out the Hole in the Roof
Measure to either side of the nail and mark the
17x17 or 17 x 26 opening required. This is
measured on the horizontal; actual length may be
larger depending on the pitch of the roof. Cut out and
frame the opening. See Chapter 25 of the Uniform
Building Code for Roof Framing Details.
Be sure to maintain a 2 minimum air space
between the chimney section and the roof.
11.Assembling the Chimne Sections
Through the Roof
Continue to add chimney sections through the roof
opening, maintaining at least a 2 air space.
12.Installing the Roof Flashing
If a roof flashing is to be used, install the roof flashing
appropriate to the roof pitch and install a round
termination cap following the instructions shipped
with the cap.
For chase installations you can use a round
termination cap (TR11), a round telescoping
termination cap (TR11T) or a square termination cap
(ST1175). A chase installation must use a chase top.
Chase tops are a ailable from your Heatilator
distributor. See page 20 for building a chase.
13.Installing the Outside Air Kit
The outside air kit is supplied as a standard feature
with this fireplace and its use is highly recommended
to minimize the effects of negati e pressure within the
structure. It is recommended to utilize the shortest
duct run to optimize the performance of the outside
air kit. The outside air kit inlet thimble should be
positioned at least four feet abo e the ground le el,
in a manner that will not allow snow, lea es, etc. to
block the inlet.
The outside air kit is installed on the left hand side of
the fireplace. Remo e the co er plate from the side of
the fireplace assembly where the air kit is to be
installed. See Figure 15 for handle location.
14.Installing the Chimne Air Kit
When installing the chimney air kit, follow the
instructions pro ided with this accessory.

12-01 17 34922 Rev B
T4800 INSTALLATION INSTRUCTIONS
NOTE: Use only a noncombustible material to fin-
ish the face of the fireplace below the le el of the
front standoffs. A noncombustible material such as
USG MICORE CV230 Mineral Fiber Board, or USG
DUROCK Cement Board is recommended for this
purpose.
Figure 16 - Air Clearance Around Gas Line
CAUTION:
When using a gas log set, the fireplace damper
must be set in the fully open position. This en-
sures proper venting of combustion products.
WARNING!
This fireplace was not tested by the fireplace
manufacturer for use with an unvented gas log
heater. To reduce risk of injury, do not install an
unvented gas log heater in this fireplace unless
it has been specifically tested and listed by
Underwriters Laboratories Inc. for use in this
specific model fireplace. Unless the unvented
gas log heater is tested and listed for use in this
factory-built fireplace, a fire hazard may be cre-
ated that can result in a structure fire.
16.Gas Log/Lighter Provisions
Knockouts are pro ided on both sides of the fireplace
to allow for connection of a certified gas log lighter or
a decorati e gas appliance with a maximum input of
100,000 BTU/hour, incorporating an automatic gas
shut-off de ice and complying with the Standard for
Decorati e Gas Appliances for Installation in
Vented Fireplaces, ANSI Z21.60. The decorati e gas
appliance should be installed in accordance with the
National Fuel Gas Code, ANSI Z223.1-1980. The side
refractories are designed to allow ½ iron pipe to pass
through. Use a noncombustible sealant to seal any
opening between the gas pipe and refractory on the
inside. Repack the insulation remo ed to seal around
the gas pipe where it exits the side of the fireplace. A
minimum 1½ air clearance must be pro ided around
the ½ iron pipe for a minimum of 4 inches beyond
the fireplace. See Figure 16.
CLEARANCES!
A minimum 1½ air clearance must be maintained
at the back and sides of the fireplace assembly
except at the nailing flange where the clearance is
½.
Chimney sections at any level require a 2 minimum
air space clearance between the framing and
chimney section.
15. Completion of the Enclosure
Complete the fireplace enclosure, allowing space for
outside air ducts and gas piping if desired. Electrical
wiring should not come in contact with the fireplace.
A minimum clearance of 1½ must be maintained
between the fireplace sides and the enclosure as
well as the fireplace back and the enclosure. See
pages 9-10 for framing details.

34922 Rev B 18 12-01
T4800 INSTALLATION INSTRUCTIONS
Figure 17 - Factory Built Hearth Extension
Figure 18 - Field Constructed Hearth Extension
WARNING!
Hearth extensions are to be installed only as illustrated to prevent high temperatures from occurring
on concealed combustible materials. Hearth sealing strips prevent burning or hot particles from inad-
vertently falling directly on combustible surfaces in the event the building should settle and disturb
the original construction.
17.Hearth Extension
A hearth extension must be installed with all fireplaces to protect the combustible floor in front of the fireplace from
both radiant heat and sparks.
The construction of, and materials used for a hearth extension are shown in Figures 17 and 18. A hearth extension
of this construction may be co ered with any noncombustible decorati e material and may ha e a maximum thickness
as per the illustration. Seal gaps between the hearth extension and the front of the fireplace with a bead of
noncombustible sealant.
Field constructed hearth extensions should be constructed in accordance with the instructions in Figure 18. The
field constructed hearth extension must be constructed from ½ MICORE CV230, or a material with an equi alent
insulation alue.

12-01 19 34922 Rev B
T4800 INSTALLATION INSTRUCTIONS
Figure 19 - Position the Hearth Extension
18.Position the Hearth Extension
Position and secure the hearth extension o er the
protecti e metal strips that ha e been placed partially
under the fireplace front. These strips should be
protruding approximately 2 from under the fireplace
front and 2 on both sides of the fireplace opening.
Seal the crack between the hearth extension and
fireplace with a bead of noncombustible sealant.
See Figure 19. Apply a noncombustible finishing
material of your choice to the hearth extension.
19.Finishing Material
Do not install combustible materials over the black
face of the fireplace! This poses a safety hazard and
may start a fire. You may only use noncombustible
material o er the black face of the fireplace.
a. Combustible Material
Material which is made of or surfaced with wood,
compressed paper, plant fibers, plastics, or any
material capable of igniting and burning, whether
flame proofed or not, plastered or unplastered.
b. Noncombustible Material
Material which will not ignite and burn. Such
materials are those consisting entirely of steel,
iron, brick, tile, concrete, slate, glass or plasters,
or any combination thereof.
c. Noncombustible Sealant Material
Sealants which will not ignite and burn; General
Electric RTV103 Black (or equi alent), Rutland,
Inc. Fireplace Mortar #63 (or equi alent).
After completing the framing and applying the
facing material (dry wall) o er the framing, a ½
wide (maximum) bead of noncombustible
sealant must be used to close off any gaps at
the top and sides between the fireplace and
facing to pre ent cold air leaks.
Only noncombustible materials may be used to
co er the black metal fireplace front.
20.Mantel
A combustible mantel may be positioned no lower
than 12 abo e the top of the fireplace opening. The
combustible mantel may ha e a maximum depth of
12. Combustible trim pieces that project no more
than 1½ from the face of the fireplace can be placed
no closer than 6 from the top and side of the fireplace
opening. Combustible trim must not co er the black
metal surfaces of the fireplace. This mantel clearance
is in accordance with Section 7-3.3.3 of ANSI/
NFPA211.
21.Glass Doors
This fireplace has been tested and listed for use with
doors as specified in Section C, Fireplace System
Components. Please refer to the manual packed
with each set of doors for installation instructions.

34922 Rev B 20 12-01
T4800 INSTALLATION INSTRUCTIONS
G. CONSTRUCTING A CHASE
Figure 20 - Chase Constructions
Figure 21 - Chase Assembly
1. Materials
a. The chase is constructed using framing
materials much the same as the walls in your
home. A ariety of materials may be used
including brick, stone, eneer brick, or standard
siding materials.
b. In constructing the chase, se eral factors must
be considered:
1) Maintain a 2 air space around the chimney.
2) The chase top must be constructed of
noncombustible material.
3) In cold climates, a firestop spacer should be
installed in an insulated false ceiling at the
8 le el abo e the fireplace assembly. This
reduces heat loss through the chase.
4) In cold climates, the walls of the chase
should be insulated to the le el of the false
ceiling as shown in Figure 21. This will help
reduce heat loss from the home around the
fireplace.
A chase is a ertical boxlike enclosure built around the
chimney and fireplace. A chase may be constructed for
the fireplace and chimney or for the chimney only. It is most
commonly constructed on an outside wall.
In cold climates, it is recommended that the chase floor
be insulated using batt type insulation between the floor
joists.
Three examples of chase applications are shown in
Figure 20.
1. Fireplace and chimney enclosed in an exterior
chase.
2. Chimney offset through exterior wall and
enclosed in chase.
3. Chase constructed on roof.