Heatilator CL36D Manual

02-02 1 12538 Rev D
CL36D and CR36D
WOODBURNING FIREPLACE
INSTALLATION & OPERATING
INSTRUCTIONS
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 qualified installer, service agency or the gas supplier.

12538 Rev D 2 02-02
CL36D AND CR36D INSTALLATION INSTRUCTIONS
CAUTION:
Do not expose the fireplace to the elements (i.e. rain, etc.) and eep the fireplace dry at all times. Wet insulation
will produce an odor when the fireplace is used.
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.
5. 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 29 for cleaning
instructions.
Table of Contents
Design and Installation Considerations ........................................................................................... 3
A. Listings and Code Approvals .......................................................................................................... 4
B. Description of the Fireplace System .............................................................................................. 4
C. Fireplace System Components ...................................................................................................... 5
D. re-Installation reparation .......................................................................................................... 10
E. Chimney Requirements ................................................................................................................ 12
F. Installation of Fireplace ................................................................................................................ 15
G. Constructing a Chase .................................................................................................................. 22
H. Operating Instructions .................................................................................................................. 25
I. Maintenance Instructions ............................................................................................................. 29
Index ........................................................................................................................................... 31
Warranty ...................................................................................................................................... 32

02-02 3 12538 Rev D
CL36D AND CR36D 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.

12538 Rev D 4 02-02
CL36D AND CR36D 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 purposes
only. Actual installation may ary slightly due to indi-
idual design preferences. Howe er, minimum and maxi-
mum clearances must be maintained at all times.
The illustrations and diagrams used throughout these
installation instructions are not drawn to scale.
Figure 1 - Typical Fireplace System
B. DESCRIPTION OF THE FIREPLACE SYSTEM
A. LISTINGS AND CODE APPROVALS
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 and Canada.
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.

02-02 5 12538 Rev D
CL36D AND CR36D INSTALLATION INSTRUCTIONS
C. SYSTEM COMPONENTS
1. Fireplace Components
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B6341DssarBdehsiloP-weiV-raelC,dlof-iB-srooDssalG
S6341DleetSsselniatS-weiV-raelC,dlof-iB-srooDssalG
6341PDkcalB-detniT-srooDssalG
B6341PDssarBdehsiloP-detniT-srooDssalG
S6341PDleetSsselniatS-detniT-srooDssalG
6341EPDlenaPdnE-srooDssalG
B6341EPDssarBdehsiloP-lenaPdnE-srooDssalG
S6341EPDleetSsselniatS-lenaPdnE-srooDssalG
3XHnoisnetxEhtraeH
R3RG/L3RG)ecalperiFhtiwdedulcni(etarGlargetnI
41KA)ecalperiFhtiwdedulcni(tiKriAedistuO
Bi-Fold Glass Doors
DM1436
DM1436B
DM1436S
Perception Glass Doors
DP1436
DP1436B
DP1436S
Perception Glass Door
End Panel
DPE1436
DPE1436B
DPE1436S
HX3 - Hearth Extension
GR3L/GR3R Integral
Grate

12538 Rev D 6 02-02
CL36D AND CR36D INSTALLATION INSTRUCTIONS
AK14 - Outside Air Kit
Fireplace Dimensions

02-02 7 12538 Rev D
CL36D AND CR36D 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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213LSgnol"21-noitceSyenmihC
813LSgnol"81-noitceSyenmihC
423LSgnol"42-noitceSyenmihC
633LSgnol"63-noitceSyenmihC
843LSgnol"84-noitceSyenmihC
3LSrezilibatSyenmihC
513LS°51-nruteR/tesffOyenmihC
033LS°03-nruteR/tesffOyenmihC
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933SF°51-potseriF
043SF°03-potseriF
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64SDL'6x'4-duorhSevitaroceD

12538 Rev D 8 02-02
CL36D AND CR36D INSTALLATION INSTRUCTIONS
#golataCAB
603LS"6"¾4
213LS"21"¾01
813LS"81"¾61
423LS"42"¾22
633LS"63"¾43
843LS"84"¾64
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SL3 - Chimney Stabilizer Offset/Return
RF370 - Roof Flashing
Flat to 6/12 Pitch
RF371 - Roof Flashing
6/12 to 12/12 Pitch
CB876
Chimney Brac et
AS8
Straight Attic
Insulation Shield
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933SF°5181
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Chimney Sections
Firestop Spacer
JB877
Joint Band
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513LS°51
033LS°03

02-02 9 12538 Rev D
CL36D AND CR36D INSTALLATION INSTRUCTIONS
LDS33 (3 x 3)
LDS46 (4 x 6)
Decorative Shroud
TR344
Round
Termination Cap TR342
Round Telescoping
Termination Cap
ST375
Square
Termination Cap
CT35
Chase Top
CAK4A
Chimney Air Kit
TS345/TS345P
Square
Termination Cap

12538 Rev D 10 02-02
CL36D AND CR36D INSTALLATION INSTRUCTIONS
Figure 3
Installation Along a Wall or an Exterior Chase
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 smo ing 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
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.
CLEARANCES!
A minimum ½ air clearance
must be maintained at the
bac and side of the fireplace
assembly.
Chimney sections at any level
require a 2 minimum air
space clearance between the
framing and chimney section.
D. PRE INSTALLATION PREPARATION
Figure 3 shows a 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.
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5
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02-02 11 12538 Rev D
CL36D AND CR36D INSTALLATION INSTRUCTIONS
Figure 4 - Framing the Fireplace
WARNING!
Do not apply combustible finishing materials over any part of the blac face of this fireplace or a structure fire
may result. The blac metal fireplace front may only be covered with noncombustible materials such as ce-
ramic tile, bric or stone. Do not cover or bloc 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.
2. Framing the Fireplace
The CL36D/CR36D fireplace will fit a framed opening of 44 or 365/8 wide (depending on where the outside air is
located) x 42½ tall. The finished ca ity depth must be no less than 22½.
Figure 4 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.
CLEARANCES!
A minimum ½ air clearance must be
maintained at the back and side of the
fireplace assembly.
Chimney sections at any le el require a
2 minimum air space clearance
between the framing and chimney
section.

12538 Rev D 12 02-02
CL36D AND CR36D INSTALLATION INSTRUCTIONS
3. Sidewalls/Surrounds
Adjacent combustible side walls must be located a minimum of 18 from the fireplace opening. See Figure below. If
you are using a decorati e surround constructed of combustible material, it must be located within the shaded area
defined below. Short stub walls are also acceptable if they are contained within the shaded area.
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 14 ft.
2. Minimum height with offset/return 14.5 ft.
3. Maximum height 50 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 20 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.

02-02 13 12538 Rev D
CL36D AND CR36D INSTALLATION INSTRUCTIONS
WARNING!
Do not combine offsets to create an offset greater than 30° from vertical.
This may create a fire hazard since the natural draft may be restricted.
1. Using Offsets and Returns
a. To bypass any o erhead obstructions, the chimney may be offset using a 15° (SL315) or a 30° (SL330) offset/
return. 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 5,
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.
5) Whene er the chimney penetrates a floor/ceiling, a firestop spacer must be installed.
6) The effecti e height of the fireplace assembly is 38½ and is measured from the base of fireplace to top
of starter collar.
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
SL312s.
Figure 5 - Chimney Offset/
Return
* Proper assembly of air cooled chimney parts result in an o erlap at chimney
joints of 1¼. Effecti e length is built into this chart.
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1
5
/ 8 "31
3
/ 8 "3
7
/ 8 "41
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/ 2 "------
2
7
/ 8 "71
3
/ 4 "6
1
/ 4 "81
5
/ 8 "1 - - - - -
--8
5
/ 8 ""¾222-----
4
1
/ 2 "32
5
/ 8 "9
1
/ 4 "32
3
/ 4 "- 1 - - - -
--11
5
/ 8 "72
7
/ 8 "11- - --
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3
/ 8 "21
1
/ 4 ""92--1---
7
1
/ 4 ""4341
5
/ 8 ""33-2----
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1
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1
/ 8 "---1--
--71
5
/ 8 "83
1
/ 4 "1 - - 1 - -
--02
5
/ 8 "34
1
/ 2 "- - 2 - - -
01
5
/ 8 "64
3
/ 4 "12
1
/ 4 "44
5
/ 8 "----1-
11
7
/ 8 "15
3
/ 8 "32
5
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3
/ 8 "1 - - - 1 -
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5
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7
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3
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3
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1
/ 4 "55
3
/ 4 "-----1
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5
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1
/ 2 "86
3
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5
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1
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5
/ 8 "53
5
/ 8 "96
1
/ 2 "--1--1
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5
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5
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3
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5
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/ 2 ""7498
1
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52
7
/ 8 "301
1
/ 2 "05
5
/ 8 "59
1
/ 2 "-----2
Table 1 Offset Chart*

12538 Rev D 14 02-02
CL36D AND CR36D INSTALLATION INSTRUCTIONS
Figure 6 - Chimney Height
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3
/ 4 "
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513LS31
3
/ 8 "
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½ "
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173FR0
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603LS4
3
/ 4 "
213LS01
3
/ 4 "
813LS61
3
/ 4 "
423LS"¾22
633LS43
3
/ 4 "
843LS64
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 (38½) 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 Table 2 to determine what components
must be selected to complete the fireplace
installation.
d. Determine the number of firestop spacers,
stabilizers, 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 6.
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.

02-02 15 12538 Rev D
CL36D AND CR36D 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 ma e 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 7 - 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 10-12. Slide the
fireplace into position. Be sure to provide the
minimum ½ air clearance at the sides and bac of
the fireplace assembly.
2. Placing the Protective Metal Hearth
Strips
Included with your fireplace you will find three 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 each 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7.
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.

12538 Rev D 16 02-02
CL36D AND CR36D INSTALLATION INSTRUCTIONS
Figure 9
Installing the Firestop Spacer
CAUTION:
Firestop spacers must be used whenever the
chimney penetrates a ceiling/floor area.
Figure 8
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
bloc ed, 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8.
5. Installing Firestop Spacers
Mark and cut out an opening in the ceiling for the
firestop spacer being utilized (14½ x 14½ for an
FS338, 14½ x 183/8 for an FS339 and 14½ x 23
for an FS340). 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 9.

02-02 17 12538 Rev D
CL36D AND CR36D 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 loc ed together. Plan ahead to
ensure the proper installation height is achieved
with the selected chimney components.
Figure 10 - Installing an Attic 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 11 - 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 10.
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 12 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 11.

12538 Rev D 18 02-02
CL36D AND CR36D INSTALLATION INSTRUCTIONS
Figure 12 - Ceiling/Attic Construction
Figure 13 - 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12.
10.Cutting out the Hole in the Roof
Measure to either side of the nail and mark the
14½x14½ 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 (TR344), a round telescoping
termination cap (TR342) or a square termination cap
(ST375/TS345/TS345P). A chase installation must
use a chase top. Chase tops are a ailable from your
Heatilator distributor. See page 22 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 13 for handle location/operation.
14.Installing the Chimne Air Kit
When installing the chimney air kit, follow the
instructions pro ided with this accessory.

02-02 19 12538 Rev D
CL36D AND CR36D INSTALLATION INSTRUCTIONS
Note: Use only a noncombustible material to finish
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 14 - Air Clearance Around Gas Line
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 ½ must be maintained
between the fireplace sides and the enclosure as
well as the fireplace bac and the enclosure. See
pages 10-12 for framing details.
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 ris 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
created 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 14.
CLEARANCES!
A minimum ½ air clearance must be maintained
at the bac and side of the fireplace assembly.
Chimney sections at any level require a 2
minimum air space clearance between the
framing and chimney section.

12538 Rev D 20 02-02
CL36D AND CR36D INSTALLATION INSTRUCTIONS
Figure 15 - Factory Built Hearth Extension
Figure 16 - 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 15 and 16. 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 16. In all
cases, the hearth extension must extend a minimum of 16 to the front and 8 on either side of the fireplace opening.
The field constructed hearth extension must be constructed from ½ MICORE CV230, or a material with an equi alent
insulation alue.