Heatilator NA36 Manual

07/03 17789 Rev H 1
INSTALLATION & OPERATING
INSTRUCTIONS
NA36 NA42
WOODBURNING FIREPLACE
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.

2 17789 Rev H 07/03
NA SERIES INSTALLATION INSTRUCTIONS
CAUTION:
Do not expose the fireplace to the elements (i.e. rain, etc.) and keep the fireplace dry at all times. Wet insula-
tion 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. 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
Safety Precautions
1. lease 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 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 available to the fire for the
fireplace to operate properly. To achieve this, the use of the optional outside air kit is highly recommended.
In the event the home is unusually tightly sealed, the optional combustion air kit may not provide all the air required
to support combustion. Hearth & Home Technologies 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.
. The fireplace must be installed with the Hearth & Home Technologies SL Series Chimney System.
The chimney system must always terminate outside the building. Be sure to follow all chimney specifications given in
these installation instructions.
5. NEVER leave children unattended when there is a fire burning in the fireplace.
6. This fireplace is built for solid fuel only. NEVER use gasoline, gasoline type lantern fuel, kerosene, charcoal light 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 servicing this fireplace, always shut off any electricity or gas to the fireplace. This will prevent possible electric
shock or burns. Also, make sure the fireplace is completely cooled before servicing.
10. To ensure a safe fireplace system and to prevent the build up of soot and creosote, inspect and clean the fireplace
and chimney prior to use and periodically during the burning season. See Maintenance Instructions in this manual
for cleaning instructions.
WARNING!
This appliance is tested and listed for use only with the optional accessories listed in these instructions. Use
of optional accessories not specifically tested for this appliance could void the warranty and/or result in a
safety hazard.

07/03 17789 Rev H 3
NA SERIES INSTALLATION INSTRUCTIONS
DESIGN AND INSTALLATION CONSIDERATIONS
When selecting a location for your woodburning fireplace, it is important to evaluate 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 envelope (insulated ceilings). This has increased the Stack Effect, a condition that increases the negative
pressure generated by the structure. This negative pressure will directly affect the drafting performance of a fireplace
chimney. To minimize the negative pressure generated by stack effect, make certain that all duct work 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 observed 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 vent gas fireplace. Basements
always have a significant negative air pressure that causes the fireplace system to be more susceptible to smoke spillage
and cold flue back drafting. Since direct vent gas fireplaces are sealed, they are not affected by the negative 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 overall height of the living 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 vent 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 conventionally vented (B-vent) 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.

4 17789 Rev H 07/03
NA SERIES 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
b. Refractory
c. Chimney Termination Cap
d. Chimney System
e. Hearth Extension
2. Optional Components Include:
a. Glass Doors
b. Chimney Air Kit
c. Outside Combustion Air System
d. Fan Kit
Note: Illustrations used throughout these instructions
reflect typical installations and are for design purposes
only. Actual installation may vary slightly due to indi-
vidual design preferences. However, 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 UL127 and ULC-S610 standards, and has
been listed by Underwriters Laboratories Inc. for installation
and operation in the United States and Canada 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. However, 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 Services
Department, Hearth & Home Technologies, 1915 W.
Saunders St., Mt. leasant, Iowa 52641 (1-800-843-2848).
Heatilator® is a registered trademark of Hearth & Home
Technologies Inc., Division, HON INDUSTRIES.

07/03 17789 Rev H 5
NA SERIES INSTALLATION INSTRUCTIONS
C. SYSTEM COMPONENTS
1. Firep ace Components
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HEARTH EXTENSION
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4XH"66"02
GLASS DOORS
DM1036 DM10 2
DM1036B DM10 2B
DM1036S DM10 2S
NADM1036B NADM10 2B
DP1036 DP10 2
DP1036B DP10 2B
DP1036S DP10 2S
INTEGRAL GRATE
(supplied)
GR /GR6
FAN KIT
FK18/NAFK18
JUNCTION BOX
JK8
DMA1036B
DMA10 2B

6 17789 Rev H 07/03
NA SERIES INSTALLATION INSTRUCTIONS
Fireplace Dimensions
OUTSIDE AIR KIT
AK1 /
NAAK1

07/03 17789 Rev H 7
NA SERIES INSTALLATION INSTRUCTIONS
2. Chimney Components
The following pictures show only those chimney components which may be safely used with this fireplace.
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8 17789 Rev H 07/03
NA SERIES INSTALLATION INSTRUCTIONS
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SL3 - Chimney Stabilizer SL330/NASL330
Offset/Return
RF370/NARF370 - Roof Flashing
Flat to 6/12 Pitch
RF371 - Roof Flashing
6/12 to 12/12 Pitch
CB876
Chimney Bracket
AS8
Straight Attic
Insulation Shield
Chimney Sections
Firestop Spacer
JB877
Joint Band
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213LS"21"¾01
213LSAN"21"¾01
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423LS"42"¾22
633LS"63"¾43
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843LS"84"¾64
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833SFAN°0"½41
933SF°5181
3
/ 8 "
043SF°03"32

07/03 17789 Rev H 9
NA SERIES INSTALLATION INSTRUCTIONS
LDS33 (3 x 3)
LDS 6 (  x 6)
Decorative Shroud
TR3 /NATR3
Round
Termination Cap
TR3 2
Round Telescoping
Termination Cap
ST375
Square
Termination Cap
CT35
Chase Top
CAK A
Chimney Air Kit
TS3 5/TS3 5P
Square
Termination Cap

10 17789 Rev H 07/03
NA SERIES INSTALLATION INSTRUCTIONS
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.
Figure 2 - Fireplace Locations
1. Firep ace Locations and Space Requirements
Several options are available to you when choosing a location for your fireplace. This fireplace may be used as a
room divider, 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 movement can affect the performance and cause intermittent smoke spillage from the front of the
fireplace. Consideration should be given to these factors before deciding on a location.
CLEARANCES!
A minimum ½ air clear-
ance must be maintained
at the back and sides of
the fireplace assembly.
Chimney sections at any
level require a 2 mini-
mum air space clearance
between the framing and
chimney section.
D. PRE-INSTALLATION PREPARATION
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.
Figure 3
Installation Along a Wall or an Exterior Chase These are rough framing
dimensions only.
Figure - Corner Installation
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/ 4 "63
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/ 8 "15
3
/ 8 "
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3
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3
/ 8 "71
5
/ 8 "55
3
/ 8 "

07/03 17789 Rev H 11
NA SERIES INSTALLATION INSTRUCTIONS
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 ce-
ramic 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.
2. Framing the Firep ace
The NA Series fireplaces will fit a framed opening with the width shown in the Table below x 40¼ tall. The finished
cavity depth must be no less than 23½
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 above the level 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 main-
tained at the back and sides of the fireplace
assembly.
Chimney sections at any level require a 2
minimum air space clearance between the
framing and chimney section.
Figure 5
Framing the Fireplace

12 17789 Rev H 07/03
NA SERIES INSTALLATION INSTRUCTIONS
Figure 6 - Sidewalls and Surrounds
3. Sidewa s/Surrounds
Adjacent combustible side walls must be located a minimum of 12 from the fireplace opening. See Figure 6. If you
are using a decorative 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.
E. CHIMNEY REQUIREMENTS
When planning your fireplace location, the chimney construction and necessary clearances must be considered. The
fireplace system and chimney components have been tested to provide flexibility in construction. The following figures are
the minimum distances from the base of the fireplace.
1. Minimum overall straight height 13 ft.
2. Minimum height with offset/return 14.5 ft.
3. Maximum height 90 ft.
. 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 above the fireplace 35 ft.

07/03 17789 Rev H 13
NA SERIES 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 overhead obstructions, the chimney may be offset using a 15°
or 30° offset/return. erform 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 avoid the
overhead obstacle. See Figure 7, dimension A to determine chimney
sections required to achieve 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 vertical clearance that is needed to complete the offset and return.
) Read across the chart and find the number of chimney sections required
and the model number of those particular chimney parts.
5) Whenever the chimney penetrates a floor/ceiling, a firestop spacer must
be installed.
6) The effective height of the fireplace assembly is measured from the base
of fireplace to top of starter collar. See Figure 6.
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/213S
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/633S
633SAN
/843S
843SANABAB
1
5
/ 8 "31
3
/ 8 "3
7
/ 8 "41
1
/ 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
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7
1
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5
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1
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1
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5
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1
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5
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1
/ 2 "- - 2 - - -
01
5
/ 8 "64
3
/ 4 "12
1
/ 4 "44
5
/ 8 "----1 -
11
7
/ 8 "15
3
/ 8 "32
5
/ 8 "84
3
/ 8 "1 - - - 1 -
--62
5
/ 8 "35
7
/ 8 "---2- -
31
3
/ 4 "85
3
/ 8 "72
1
/ 4 "55
3
/ 4 "----- 1
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5
/ 8 ""951 - -- - 1
61
1
/ 2 "86
3
/ 4 "23
5
/ 8 "46
1
/ 4 "- 1 - - - 1
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5
/ 8 "53
5
/ 8 "96
1
/ 2 "--1-- 1
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5
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52
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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 7 - Chimney Offset/
Return
Tab e 1 Offset Chart*
* roper assembly of air cooled chimney parts result in an overlap at chimney joints of
1¼. Effective length is built into this chart.

14 17789 Rev H 07/03
NA SERIES INSTALLATION INSTRUCTIONS
Figure 8 - Chimney Height
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/ 4 "
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/ 8 "
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073FRAN/073FR0
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603LS4
3
/ 4 "
213LSAN/213LS01
3
/ 4 "
813LS61
3
/ 4 "
423LS"¾22
633LSAN/633LS43
3
/ 4 "
843LSAN/843LS64
3
/ 4 "
*Dimensions reflect effective height.
Tab e 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 vertical 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 effective height of the fireplace
assembly from the overall 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, stabi-
lizers, roof flashing, etc. required to complete the
fireplace installation.
2. Chimney Height Requirements (above roof
ine)
a. Major building codes specify a minimum chimney
height above 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
above the peak of the roof, but never less than
three feet in overall height above 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 above this reference point, but
never less than three feet in height above 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,
adverse wind conditions, etc. may create a need
for a taller chimney should smoking occur.

07/03 17789 Rev H 15
NA SERIES 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 Firep ace
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 air clearance at the sides and back of
the fireplace assembly.
2. P acing the Protective Meta Hearth Strips
Included with your fireplace you will find two metal
hearth strips measuring approximately 26 x 4. These
strips are used to provide added protection where the
fireplace and the hearth extension meet.
Slide each metal strip 2 under the front edge of the
fireplace. The individual pieces must overlap each
other by 1 minimum in the middle of the fireplace to
provide continuous coverage of the floor. See Figure9.
These metal strips should extend from the front and
sides of the fireplace opening by 2.
3. Leve ing the Firep ace
Level 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
vertical framing.

16 17789 Rev H 07/03
NA SERIES 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 cool-
ing air.
4. Assemb ing Chimney 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. Insta ing Firestop Spacers
Mark and cut out an opening in the ceiling for the
firestop spacer being utilized (14½ x 14½ for an
FS338/NAFS338, 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 provide 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 above is an insulated ceil-
ing or attic space. In this situation, the firestop spacer
must be nailed from the top side to prevent loose in-
sulation from falling into the required 2 air space
around the chimney. See Figure 11.

07/03 17789 Rev H 17
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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
disassembled once locked together. Plan
ahead to ensure the proper installation height
is achieved with the selected chimney compo-
nents.
Figure 12 - Installing an Attic Insulation Shield
Note: You must provide support for the pipe during
construction and check to be sure inadvertent load-
ing 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 Insu ation Shie d
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 over the vertical chimney
section where it penetrates a firestop spacer. The
firestop spacer will support the insulation shield. See
Figure 12.
7. Doub e-checking the Chimney Assemb y
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 given 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 have been connected
correctly, they will not disengage when tested.
8. Securing the Chimney System
When offsets and returns are joined to straight pipe
sections, they must be locked into position with the
screws provided (outer only), using the predrilled holes.
To prevent gravity from pulling the chimney sections
apart, the returns and the chimney stabilizers have
straps for securing these parts to joists or rafters. See
Figure 13.

18 17789 Rev H 07/03
NA SERIES INSTALLATION INSTRUCTIONS
Figure 1 - Ceiling/Attic Construction
Figure 15 - 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. Drive
a nail up through the roof to mark the center. See
Figure14.
10. Cutting out the Ho e 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. Assemb ing the Chimney Sections Through the
Roof
Continue to add chimney sections through the roof
opening, maintaining at least a 2 air space.
12. Insta ing the Roof F ashing
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/NATR344), a round telescoping
termination cap (TR342) or a square termination cap
(ST375/TS345/TS345 ). A chase installation must use
a chase top. Chase tops are available from your
Heatilator distributor. See page 22 for building a chase.
14. Insta ing the Chimney Air Kit (Required in
Canada)
When installing the chimney air kit, follow the
instructions provided with this accessory.
13. Insta ing the Outside Air Kit
The outside air kit is supplied as an optional feature
with this fireplace and its use is highly recommended
to minimize the effects of negative 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 above the ground level, in a manner
that will not allow snow, leaves, etc. to block the inlet.
The outside air kit may be installed on either the left
hand or right hand side of the fireplace. Remove the
cover plate from the side of the fireplace assembly
where the air kit is to be installed. Install the outside
air kit as detailed in the installation instructions provided
with the outside air kit. See Figure 15 for handle
location/operation.
15. Insta ing a Fan Kit
If a fan kit is desired, the FK18/NAFK18 fan kit contains
all material needed to complete the fan installation.
Follow the instructions provided with the fan kit.
If you are not going to install a fan kit at this time, we
recommend that you pre-wire by purchasing the JK8
junction box. In line with this junction box, you must
have an ON/OFF switch or a BC10. The FK18/NAFK18
fan kit can be added at a later date.
CAUTION:
The air kit handle may get hot while burning
the fireplace. Use care when operating the
handle.

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Note: Use only a noncombustible material to finish
the face of the fireplace below the level 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
16. Comp etion of the Enc osure
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 back 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 manu-
facturer 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 Labo-
ratories 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.
17. Gas Log/Lighter Provisions
Knockouts are provided on both sides of the fireplace
to allow for connection of a certified gas log lighter or
a decorative gas appliance with a maximum input of
100,000 BTU/hour, incorporating an automatic gas
shut-off device and complying with the Standard for
Decorative Gas Appliances for Installation in
Vented Fireplaces, ANSI Z21.60. The decorative gas
appliance should be installed in accordance with the
National Fuel Gas Code, ANSI Z223.1-1980.
CLEARANCES!
A minimum ½ air clearance must be maintained at
the back and sides of the fireplace assembly.
Chimney sections at any level require a 2 minimum
air space clearance between the framing and chim-
ney section.
WARNING!
Disconnect power before stripping or joining any
supply wires. Only persons qualified for making
electrical installations (electricians) as recognized
by local or national governmental bodies should
attempt to make the incoming supply wire connec-
tions.
Edges are sharp! Hand protection is recommended.
Recheck all fasteners before leaving the job.
Note: A BC10 motor speed control kit is available for
use with this fan kit. Refer to the instructions packed with
it for proper installation. If a speed control option is
desired, it is recommended that you use the BC10 kit to
ensure proper function.
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 removed to seal
around the gas pipe where it exits the side of the
fireplace. A minimum 1½ air clearance must be
provided around the ½ iron pipe for a minimum of 4
inches beyond the fireplace. See Figure 16.

20 17789 Rev H 07/03
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WARNING!
Hearth extensions are to be installed only as illustrated to prevent high temperatures from occurring on con-
cealed combustible materials. Hearth sealing strips prevent burning or hot particles from inadvertently falling
directly on combustible surfaces in the event the building should settle and disturb the original construction.
18. 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 covered with any noncombustible decorative material and may have 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 equivalent insulation
value.
Figure 17 - Factory Built Hearth Extension
Figure 18 - Field Constructed Hearth Extension