StoneAge NA36IND Owner's manual

1
Report 307-F-02b-2
Installation and Operation
Instructions
Stone Age Indoor Fireplace
1.0 Introduction
The following provides instructions for the installation
and operation of the Stone Age Fireplace, manufac-
tured by Stone Age Manufacturing, Collinsville, Okla-
homa.
Three generations of fireplace knowledge and experi-
ence have gone into the design and construction of the
New Age series fireplaces. New Age Fireplaces are
certified to UL127 for the US, and ULCS610 for Can-
ada. They are also certified in accordance with ICC-
ES AC156 meeting structural design requirements for
Earthquake Testing at a compliance level of Sds =
2.5g. The ICC-ES AC156 complies with 2010 Ameri-
can Society of Civil Engineers (ASCE) 7-10, 2009
International Building Code (IBC), 2010 California
Building Code and 2012 ICC-ES AC156. Assembly
and Cutaway views of a NA36IND fireplace are
shown in Figure 1.
Because of structural modifications required in an ex-
isting home, it is recommended that this fireplace be
installed by a professional installer, or by a builder in
new construction. Installation by a non-qualified per-
son may negate the warranty.
Keep these instructions for future use.
2.0 Description
The fireplace is delivered as a kit with all components
necessary to complete the installation. The kit is con-
figured for a flue chimney, but a special adapter is
available for a metal chimney. Component arrange-
ment, some of which is optional, is shown in Figure 2.
Components are shown in Table 1. Specifications and
installation dimensions are shown in Table 2.
A completed installation should include the following:
A. Fireplace items shown in Figure 2 and listed in
Table 1.
B. Damper (sold separately) (Shown in Figure 11).
C. Chimney Cap (sold separately) (Shown in Figure
22).
D. Fireplace Grate (sold separately) (Shown in Fig-
ure 26).
E. Full firebrick (sold separately)
F. Stone Age Multi-Purpose Ready-Mix Cement
(sold separately).
The Stone Age Fireplace has been tested and listed in
accordance with UL 127 and ULC S610 standards for
indoor or outdoor use, and is listed by OMNI-Test La-
boratories, Inc. for installation and operation in the
United States and Canada as described in this manual.
This fireplace is designed to supplement your current
heating system. It is not designed to be used as a pri-
mary heat source.
Ensure that appropriate building permits required by
local codes are obtained before installation in an exist-
ing home.
Ce manuel est disponible en français à www.stoneagemanufacturing.com.
This manual is available in French at www.stonea
g
emanufacturin
g
.co
m
.
NA36IND
Front View
Side
Cutaway
V
iew
Figure 1. NA36IND Fireplace Assembly
& Cutawa
y
View

2
Table 1. Fireplace Components
Item Description
1 Base Plate
2 Lower & Middle Sidewall
3A Lower Back Plate
3B Lower Back Plate
4A Middle Back Plate
4B Middle Back Plate
5A Upper Back Plate
5B Upper Back Plate
6 Upper Slanted Sidewall - Right
7 Upper Slanted Sidewall - Left
8 Front Header
9 Lower Throat – Right Front
10 Lower Throat – Left Front
11 Lower Throat – Left Rear
12 Lower Throat – Right Rear
13 Middle Throat – Right Rear
14 Middle Throat – Right Front
15 Middle Throat – Left Front
16 Middle Throat – Left Rear
17 Upper Throat – Right Rear
18 Upper Throat – Right Front
19 Upper Throat – Left Front
20 Upper Throat – Left Rear
21 Throat Cap – Right
22 Throat Cap - Left
23 Masonry Chimney Block or Metal Flue
Adapter (Sold separately, Not shown)
2.1 Specifications
Table 2: Clearances (See Figure 3)
NA 36 Fireplace
Item Clearance Figure 2
Reference
Backwall 0
Sidewalls 0 to Appliances
18” from Fireplace opening
at points in front of fire-
place
Floor: Non
combustible
extending
as follows
20” when hearth is less than
6” from floor
18” when hearth is greater
than 6” from floor
A
12” Mantle 48” from hearth B
Top Trim 36” from hearth C
Side Trim 6” from fireplace opening D
Front en-
closure
Non combustible from
hearth up 36.” (E-1)
Combustible 36” from
hearth (E-2)
E
Hearth If the fireplace opening is 6
sq feet or larger, the hearth
shall extend at least 20
inches in front of the open-
ing and 12 inches beyond
each side. If the opening is
less than 6 sq feet, the
hearth shall extend at least
16 inches in front of the
opening and 8 inches be-
yond each side.
Clearance
around
chimney
0” New Age Chimney
Block
2” Metal Pipe chimney (UL
103 and ULC S604)
F
Chimney
Height
16’ from floor
Note 1: This Fireplace intended for use with solid wood
fuel or vented gas logs.
CAUTION: When using this appliance, the fireplace
damper must be set in the fully open posi-
tion.
Note 2: This fireplace has not been tested for use with glass
doors.
Note 3: Do not use fireplace insert or other products not
specified for use with this model. Use a fireplace grate
when burning wood.
Note 4: Clay flue liners installed in flue section meet the
specifications of ASTM Section C315-02.
1
2
2
2
2
3A 3B
4A
4B
5A
5B 6
7
8
9
10
11 12
13
14
15
16
17
18
19
20
21 22
Figure 2. Fireplace Components

3
Note 5: Ensure installation complies with local building
codes.
2.2 Installation of Additional Equipment
WARNING: THIS FIREPLACE HAS NOT
BEEN TESTED FOR USE WITH
DOORS. TO REDUCE THE RISK
OF FIRE OR INJURY, DO NOT
INSTALL GLASS DOORS.
A. Do not install a fireplace insert unless it is tested
with this fireplace.
B. Cutting or drilling a hole into the floor or walls
for gas supply for a vented decorative gas appliance
(log), fresh air venting, or an ash dump, is accepta-
ble.
C. If a decorative gas appliance is installed, it must
be installed in accordance with the National Gas Fire
Code, ANSI Z223.1.
D. It must incorporate an automatic shutoff device.
E. Installation must comply with the Standard for
Decorative Gas Appliances in Vented Appliances,
ANSI Z21.60 (1991) or American Gas Association
draft requirements for Gas-Fired Log Lighters for
Burning Fireplaces, Draft No. 4 dated August 1993.
3.0 Installation of the Fireplace
WARNING: DO NOT USE SUBSTITUTE
MATERIALS IN THE
ASSEMBLY, INSTALLATION OR
OPERATION OF THIS
FIREPLACE. TO DO SO WILL
VOID THE WARRANTY AND
MAY RESULT IN FIRE AND
PERSONAL INJURY.
It is most important that the Stone Age fireplace be
installed according to the following instructions. It is
also important that local building codes be consulted
and followed. Improper installation could result in:
 Overheating, leading to fireplace failure
 Leakage of rainwater through and around the
chimney
 Cracks and settling because of poor founda-
tions
 Emission of smoke, sparks and gases into the
living area
 Combustion of materials adjacent to the fire-
place.
WARNING: THIS FIREPLACE HAS NOT
BEEN TESTED WITH AN
UNVENTED GAS LOG SET. TO
REDUCE THE RISK OF FIRE OR
INJURY, DO NOT INSTALL AN
UNVENTED GAS LOG SET INTO
THIS FIREPLACE.
Do not install this fireplace in a manufactured or mo-
bile home.
3.1 Preparations
Select a wall location in the home plans where all the
minimum distances, as shown in Table 2 and Figure 3
can be met. Proceed as follows. Numbers in ( ) are
item numbers from Table 1 and Figure 2. Ensure the
base on which the fireplace is to be installed is a solid
and level foundation and is composed of non-
combustible material, such as concrete.
Select a high temperature fire clay or refractory ce-
ment and mix according to manufacturer’s instruc-
tions. Several companies in the U.S. and Canada sell
refractory cement or fire clay including Stone Age
Manufacturing.
Figure 3. Clearances (Use with Table 2)

4
Once the fireplace is constructed you must wait at least
28 days before building a fire to give adequate time to
cure. This will provide ample time for any water resi-
due to evaporate, eliminating the adverse reaction of
the combination of water and fire.
3.2 Assembly of Components
Components that become broken during shipment and
handling can be mortared back together providing the
breaks or cracks are clean and the original alignment
can be maintained. Components broken into multiple
pieces must be replaced.
If this is your first Stone Age installation, it is suggest-
ed that you first assemble the components without
mortar to familiarize yourself with how the compo-
nents fit together. See Figure 1.
A. Determine the height off the floor you want to
place the base plate (1). The base plate, plus fire-
brick, will be about 5 ½ inches thick. Set cement
blocks under the base plate to obtain the desired
height. Note that holes in many pieces of the kit al-
low the placement of rebar and mortar for additional
reinforcement, if desired.
B. When the base is level and square, set the base
plate (1). Level it from side to side and front to back.
See Figure 4.
C. Install the sidewall pieces (2) and the lower and
middle back plates (3A, 3B and 4A, 4B). Use 3/8”
joint of mortar between each section. Smooth out
mortar and ensure sections remain level. See Figures
5 and 6.
D. Lay a straightedge across the left and right side-
wall to ensure level is maintained.
E. Install the slanted sidewalls (6 and 7), and the up-
per back plates (5A, 5B). Check the sides and the
top with a level. See Figure 7.
F. After installation of the back plates and side-
walls, install the firebrick inside the firebox, using
1/8-inch mortar joints. Cover the floor first with 1/8-
inch high temperature cement. On the side walls,
stand the brick on its sides, and on the back wall, lay
the brick flat, leaving 1/2-inch air space between the
firebrick and fireplaces walls. Stack brick until it is
flush with the tops of pieces 5A, 5B, 6 and 7. See
Figures 8 and 9.
Figure 4. Base Plate
2
3A 3B
4A 4B
2 2
5A 5B 6
7
1
4A 4B
22
2
Figure 5. Lower Back Plates & Sidewalls
Figure 6. Middle Back Plates & Sidewalls
Figure 7. Upper Back Plates & Sidewalls

5
G. After fire brick installation is complete, install the
front lintel (8).
H. Install the cast iron damper. See Figures 11 and
12. Attach poker handle through damper to damper
door. Set damper on top of firebox with handle fac-
ing toward front of the fireplace. The bottom lip of
the damper should rest on the firebrick with the front
lip resting on the front header (8). Mortar damper in
place. Ensure the damper opens and closes properly.
I. Install the first complete ring of four interlocking
throat components (items 9, 10, 11 and 12). Check
with a level. See Figure 13.
J. Install second ring of four throat components
(Items 13, 14 15 16). Check with a level. See Figure
14.
8 9
10
11 12
Figure 13. Lower Throat Level
Figure 10. Front Lintel
Figure 8. Firebrick Installation
Figure 12. Damper Placement
Figure 9. Firebrick Completed
Fi
g
ure 11. Dam
p
er

6
K. Install the first smaller ring of throat components,
consisting of items 17, 18, 19 and 20. Ensure the
ring is centered. See Figure 15.
L. Install the throat cap pieces, items 21 and 22. See
Figure 16.
M. Install Stone Age masonry chimney system, con-
sisting of clay liners and outer blocks, or Stone Age
Pipe Adapter if installing a metal pipe chimney. See
Figures 17 and 18.
N. If installing a mantel and side trim, especially if
it is wood or other combustible materials, ensure the
13
14
16
15
17
18
19
20
21 22
23 Outer Block
23 Pi
p
e Ada
p
te
r
22
Cla
y
Flue
22
21
21
Figure 18. Metal Pipe Chimney
Figure 17. Stone Age Masonry Chimney
Figure 14. Middle Throat Level
Figure 15. Upper Throat Level
Figure 16. Throat Cap

7
minimum distances shown in Table 2 and Figure 2
are met.
O. Install the hearth and or hearth extension. En-
sure the Table 2 and Figure 3 clearances and distanc-
es are maintained. Ensure that the hearth and
flooring under and in front of the hearth are made of
fully non-combustible materials, not just a non-
combustible floor covering. When the hearth instal-
lation is complete, you are now ready to install the
exterior.
3.3 Exterior finishing
The exterior finish of an indoor fireplace will vary as
compared to an outdoor application and may be lim-
ited depending on location in the home and framing
that encompasses the fireplace. Mantle and exterior
veneers may be fabricated stone, thin veneer or full
bed depth natural stone, tile, brick or stucco.
If the exterior finish is going to be stucco, stain, tile or
manufactured thin stone wrap outside of firebox with
metal lathe. Attach metal lathe to firebox using con-
crete nails, tapcons, masonry or concrete anchors.
Natural stone, full bed depth or thin veneer, full size
brick, concrete pavers, CMU block, etc. do not require
metal lathe.
Ensure same refractory mortar is used.
4.0 Installation of Chimney
Either one of two types of chimney may be installed,
the Stone Age masonry chimney system consisting, of
proprietary outer blocks and clay flues, or metal pipe
chimney pipe tested and certified to UL 103 standards
for the US and ULC S604 standards for Canada.
4.1 Stone Age Masonry System
The Stone Age Masonry chimney system consists of
stacking Stone Age chimney blocks and installing a
clay flue inside.
A. Place a clay flue inside the chimney block. The
holes in each corner of the chimney block allow the
placement of rebar and mortar for additional rein-
forcement, if desired.
B. Continue with stacking the outer blocks and clay
flues until the desired height is reached. Mortar the
flue sections together, and mortar the chimney block
sections together. There will be dead air space be-
tween the flue and chimney block sections. See Fig-
ure 19.
C. The chimney is completed by stacking as many
flue sections as necessary to reach chimney height.
Chimney plumbing can either be straight through the
ceiling and through the roof, or if the fireplace is in-
stalled on an outside wall, the chimney can be external
to the house. When needed offset blocks can be used
for the chimney and should be engineered to structur-
ally support the offset with CMU or custom fabricated
steel post and or angle iron capable of supporting the
weight and height of the chimney. Never exceed
more than a 30 degree angle when offsetting a chim-
ney. See Figure 20.
D. Masonry chimneys taller than 24 feet should be
tied into the surrounding structure for additional sup-
port, due to the weight of the flue system. Consult
Offset
Blocks
CMU
Figure 20. Offset Blocks and CMU Support
Figure 19. Masonry Chimney Assembly

8
with an engineer to determine the best way to do so
for your project.
E. If chimney exit opening does not already exist
locate the point where the chimney will exit the roof
by plumbing down to the center of the fireplace
chimney. Drive a nail into the roof to mark the cen-
ter.
F. Measure to all sides of the nail and mark the re-
quired opening, and then cut a hole in the roof. Re-
member that the hole is measured on the horizontal,
and then projected to the roof. The hole may then be
larger, depending on the pitch of the roof. See Fig-
ure 21.
G. Frame the opening in the roof.
H. Continue to add flue sections, extending the
chimney through the roof.
I. Install roof flashing appropriate to the roof pitch.
J. Use mortar to create a slope away from the clay
flue, running out to the edge of the finish material, to
assist with water drainage. Install the chimney cap
following instructions provided. This will protect
the chimney from rain, birds, animals and leaves.
See Figure 22.
4.2 Metal Chimney
Install the metal chimney following the instructions
below and the instructions provided by the chimney
pipe manufacturer.
Install a Stone Age masonry pipe adapter (sold sepa-
rately) to the top of the firebox, using a 14” I.D. adapt-
er for the NA 36. Connect the first pipe section to the
metal adapter as shown in Figure 23. Chimney
plumbing can either be straight through the ceiling and
through the roof, or if the fireplace is installed on an
outside wall, the chimney can be external to the house.
Affix warning labels to the pipe. See Figure 23.
A. When the chimney passes through a ceiling to an
upper floor, ensure the chimney pipe manufacturers
recommended clearances to combustibles is main-
tained with framing where it passes through the ceil-
ing.
B. Complete chimney installation as shown in Fig-
ure 24. As the chimney extends through the attic to
the roof, attach securing straps to rafters and joists as
required to provide stability.
C. As the chimney rises through the ceiling, perhaps
a second floor, and through the attic and roof, 16
inches or 30 degrees is the maximum offset allowed,
and only one offset is permitted.
D. If chimney exit opening does not already exist, lo-
cate the point where the chimney will exit the roof by
Pipe
Adapter
Chimney
Pi
p
e
Figure 21. Roof Penetration
Figure 22. Install Chimney Cap
Figure 23. Connect Chimney
Warning
Label

9
plumbing down to the center of the chimney. Drive a
nail into the roof to mark the center.
E. Measure to all sides of the nail and mark the re-
quired opening, and then cut a hole in the roof. Re-
member that the hole is measured on the horizontal,
and then projected to the roof. The hole may then be
larger, depending on the pitch of the roof. See Fig-
ure 21.
F. Frame the opening, ensuring that the recom-
mended minimum clearance to combustibles by the
chimney pipe manufacturer exists between the roof
and the chimney, ensuring that distance is maintained
all the way around.
WARNING: DO NOT PACK REQUIRED AIR
SPACES WITH INSULATION OR
OTHER MATERIALS.
G. Continue to add pipe sections, extending the
chimney through the roof.
H. A wood chase may be constructed around the
exposed chimney for aesthetic effect. Ensure the
minimum recommended clearances to combustibles
specified by the metal chimney pipe manufacturer
are maintained inside the chase.
I. Install roof flashing appropriate to the roof pitch,
and any other pipe accessories, per the pipe manufac-
turer’s instructions.
J. Install the appropriate chimney cap for the pipe
being used.
4.3 Height of Chimney
Figure 25 illustrates the proper height of the chimney
top. Correct height depends on the chimney’s location
on the roof and distance from the peak of the roof.
Surrounding trees, other buildings and hills may also
be a consideration.
If the chimney top is not high enough, unusual
downdrafts may occur, resulting in undesired smoke
Figure 24. Metal Chimney Construction
Figure 25. Chimney Height

10
spillage. For a more thorough explanation of the fig-
ure 25 illustration, this is the traditional 2/10 rule. The
center of your chimney should be a minimum of two
feet higher than any roof or projection within ten feet
horizontally from the chimney center. This means the
chimney does not have to extend above the peak of the
roof. Once the chimney is ten feet away and extended
two feet above roof structure at that distance, the
height is sufficient, but it should never be less than
three feet taller than the point where it penetrates the
surface of the roof.
5.0 Operating Instructions
5.1 Safety Precautions
A fireplace can bring many hours of enjoyment, com-
fort and warmth if operated and maintained properly.
Certain safety precautions must be observed to elimi-
nate the dangers associated with fire and provide a
satisfactory, smoke free fire.
A. When burning wood use solid, seasoned wood
only. Do not use scrap wood or artificial wax based
logs, treated coal or woods dipped in pine tar or
pitch.
B. Never use gasoline or other combustible liquids
when starting a fire.
C. Keep the chimney damper open while burning a
fire. Do not interrupt air flow. Ensure sufficient air
is present to support combustion. The manufactur-
er of this fireplace is not responsible for interior
smoke resulting from lack of combustion air.
CAUTION: WHEN USING THE DECORATIVE GAS
APPLIANCE (VENTED GAS LOGS); THE
FIREPLACE DAMPER MUST BE SET IN
THE FULLY OPEN POSITION.
D. Keep a screen in front of the fireplace except
when tending the fire.
E. Keep combustible furniture/pillows at least four
feet from the opening.
F. Never leave the fire unattended.
G. Be extremely careful when adding wood and
handling fireplace tools. Never throw, kick or by
any other means force wood into the firebox as this
could damage the firebrick and fireplace walls that
could result in permanent damage and void the war-
ranty. Stress cracks from thermal cycling are nor-
mal.
H. Do not alter this fireplace to the extent that it
would jeopardize the structural integrity of the fire-
place. Drilling or cutting a hole for a gas line, fresh
air vent or ash dump is acceptable. Use only Stone
Age authorized equipment with this fireplace.
5.2 Selection of Wood
Use cured wood logs only. Scrap wood produces
sparks. Treated wood, coal, or woods dipped in pine
tar should not be used because they may leave a com-
bustible residue in the fireplace and chimney.
Use of seasoned wood is preferred.
The amount of heat available from logs will depend on
the type of wood, its dryness, quantity of wood and the
size of the logs. Ten pounds of twigs will produce as
much heat as a 10 pound log, but will produce it much
faster because the air supply is more available.
5.3 Softwood vs. Hardwood
Wood is divided into two classes, hard and soft woods.
Each has a use in a fireplace and each has advantages
and disadvantages.
The hardwood category includes such woods as oak,
walnut, birch, elm and maple. Softwoods include
pine, fir, cedar and spruce.
Selection of wood depends on the type of fire you
want. Softwoods are good to offset a morning chill
because the fire develops faster. Hardwoods are pref-
erable for a slower burning and uniform heat output.
Softwoods contain a highly flammable resin that will
leave creosote soot in the chimney flue. This often
results in sparking. Burning softwood exclusively will
require more frequent inspection and cleaning of the
chimney.
Experienced fire builders often use small amounts of
softwood kindling and newspaper when starting a split
hardwood log fire.
5.4 Seasoned Wood
Most freshly cut “green” wood will not burn well and
will smoke. The pressure of moisture and resin inside
green wood will build under heat and explode as
sparks. Therefore, it is recommended that only sea-
soned wood be used in your fireplace.
Most wood requires 9 to 12 months of seasoning and
drying to reduce the moisture content enough to pro-
duce good steady fires. Ensure that you buy only sea-
soned wood, or if you buy green wood (usually
cheaper), store it properly to aid in the seasoning pro-

11
cess. The following steps will assist in the seasoning
process.
A. Stack wood loosely to permit maximum air cir-
culation.
B. Do not stack wood on the ground. Use a wood
rack or stack on scrap lumber. Storage on the ground
will cause rotting and insect infiltration.
C. Cover wood stacks with a tarp so that it is not
excessively exposed to the elements such as snow
and rain.
D. Do not stack wood against the walls of your
home.
5.5 Building a Fire
A. Use a log grate (sold separately) with your fire-
place. This will contribute to good air circulation
around the wood, and keep the wood out of the ash.
This grate is shown in Figure 26.
B. Close windows located near the fireplace when
first lighting a fire to reduce the possibility of smok-
ing. It can be reopened once a draft has been created
through the chimney.
WARNING: NEVER USE GASOLINE,
GASOLINE-TYPE LANTERN
FUEL, KEROSENE, CHARCOAL
LIGHTER FLUID OR SIMILAR
LIQUIDS TO START OR
“FRESHEN UP”, A FIRE IN THE
FIREPLACE. KEEP ALL SUCH
LIQUIDS WELL AWAY FROM
THE FIREPLACE WHILE IT IS
IN USE.
C. Do not overload the wood grate with wood. Three
to four logs on the fire at one time are sufficient.
Too much wood on the fire at one time can result in
“over firing,” and too much heat in the firebox, caus-
ing damage to the fireplace.
D. When lighting a fire in a cold chimney, a
downdraft may be created, letting a little smoke into
the room. To correct this, hold a wadded newspaper
in the firebox and light it. This will create an updraft
and clear the flue of cold air.
The following steps are recommended when starting a
fire.
A. Remove any excess ash from the fireplace. Ex-
cessive ash may reduce airflow. Some owners prefer
to leave a small layer to insulate the cold refractory
brick below the grate, helping fire starting.
B. Open and close the damper to ensure it operates
properly. Leave it in the full open position when
starting a fire and while the fire is burning.
C. Center the grate over the bottom hearth of the
firebox.
D. Crumble several newspapers across the fire area
underneath the grate. Criss-cross kindling wood on
top of the grate, above the newspaper.
E. Lay three logs on the grate; two side by side and
the third in pyramid fashion on top. Split logs will
start faster. Ensure there is space between the logs
for air circulation. As the air is heated, it is drawn
upwards through the space between the logs, creating
more combustion.
F. Light the paper at both sides of the firebox.
Caution: The fireplace requires air for operation.
Ensure there is sufficient air so that other
fuel burning appliances are not starved of
combustion, ventilation, and dilution air.
G. Set the screen in front of the firebox to prevent
the escape of sparks and embers.
H. Ensure the fire remains centered in the firebox.
Don’t let it move to the front part. Move it back with
the poker.
I. Add wood to the fire as necessary.
CAUTION: Be extremely careful when adding wood
to the fire. Use proper fireplace tools and
wear gloves. If adding an un-split log, it is
possible that it may want to roll out.
Figure 26. Log Grate

12
6.0 Cleaning, Inspection and
Maintenance
As is the case with most other equipment, cleanliness
is the best maintenance practice and will contribute too
many hours of warmth and pleasure.
WARNING: DO NOT CLEAN THE FIRE-
PLACE WHEN IT IS HOT.
A. Creosote – Formation and Removal. When wood
is burned slowly, it produces tar and other organic
vapors, which combine with expelled moisture to
form creosote. The creosote vapors condense in the
relatively cool chimney flue of a slow burning fire.
As a result, creosote residue accumulates on the flue
lining. When ignited, this creosote makes an ex-
tremely hot fire. The chimney shall be inspected at
least twice a year during the heating season to deter-
mine when a creosote buildup has occurred. If a sig-
nificant layer of creosote has accumulated (3 mm or
more), it should be removed to reduce the risk of a
chimney fire.
B. Disposal of ashes - Ashes should be placed in a
metal container with a tight-fitting lid, and taken out-
side and placed on the ground, well away from all
combustible materials, pending final disposal. If the
ashes are disposed of by burial in soil or otherwise
locally dispersed, they should be retained in the
closed container until all cinders have thoroughly
cooled.
C. The grate may be removed from the firebox for
cleaning. However, ensure it is returned prior to lay-
ing the next fire.
D. Keep the fireplace screen clean so air flows
freely through it.
E. Spot check the refractory bricks and mortar for
small cracks. It will expand slightly with the heat,
and then contract as it cools. Replace refractory
bricks when the cracks open more than ¼”; or when
pits become extensive and deeper than 3/16”; or
when any piece of refractory larger than 2 inches in
diameter becomes dislodged.
F. If creosote has accumulated, it should be re-
moved to reduce the risk of a chimney fire. Clean
the chimney as outlined below or have the chimney
cleaned by a professional chimney sweep.
WARNING: DO NOT USE CHEMICAL
CHIMNEY CLEANERS THAT
ARE POURED ON A HOT FIRE.
THE CHEMICAL CLEANER CAN
BE DANGEROUS AND
GENERALLY WILL ONLY
WORK ON THE FLUE SECTION
NEAREST THE FIRE, LEAVING
THE REST OF THE FLUE
UNAFFECTED.
G. Inspect the top cap and opening in your chimney
top and remove any debris that could clog it. If pos-
sible, birds will often nest there, and it must be kept
clear of nest material.
H. Check the metal flashing and seals around the
chimney. Seal any cracks or loose nail heads to pre-
vent roof leaks.
I. Cover the firebox opening with a damp sheet and
seal with masking tape to retain soot in the firebox
while cleaning.
J. Inspect the entire flue from the top down for ob-
structions. Use a flexible handled cleaning brush. If
the chimney contains offset/return elbows, clean
from the top down to the offset, then from the fire-
box up to the offset.
K. Check the flue from inside the fireplace with the
damper open for obstructions.
L. After completion of cleaning, use a vacuum
cleaner to remove all soot and residue from the fire-
box.

13

14
Stone Age Fireplace Instructions
Models NA 36/NA36IND
Revised August 2017 Printed in USA  2013-2017, All Rights Reserved
Stone Age Manufacturing, Inc
LIMITED WARRANTY
The products of Stone Age Manufacturing, Inc. (“Stone Age”) have
been carefully manufactured and the components assembled to give the
customer a quality product. Stone Age warrants to the original pur-
chaser the materials that it provides to the customer against defects in
manufacture for a period of twenty-five (25) years from the date of pur-
chase on UL-127 listed fireplaces, for a period of five (5) years from the
date of purchase on all unlisted fireplaces, fire pits, and other masonry
components. Other accessory items or components offered, but not
produced by Stone Age Manufacturing, Inc., shall be covered by their
manufacturer’s warranties. This Limited Warranty covers only actual
manufacturing defects in the Stone Age product and does not cover de-
fects or faulty workmanship in the installation of the product or the ma-
sonry or other structure in which it is installed. Also this warranty does
not cover items that have been damaged due to over-heating, modifica-
tion, improper storage or maintenance. Stone Age shall repair or re-
place, at its option, any defective Stone Age product component upon
receipt of written notice addressed to Stone Age. This Limited Warran-
ty covers only replacement of any defective components within the
product itself occurring during the warranty period and does not cover
the cost of installation or removal from a fixed location. NO OTHER
WARRANTIES, EXPRESS OR IMPLIED, ARE MADE, INCLUDING
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
FOR PARTICULAR PURPOSES WHICH ARE SPECIFICALLY
DISCLAIMED. Stone Age is not liable for damages or injury to per-
sons or property or other incidental or consequential damages.
Stone Age Manufacturing, Inc.
11107 E. 126th St. N., Collinsville, OK 74021
WWW.Stoneagefireplaces.com