Stove Builder International MODEL OSBURN STRATFORD User manual

MODEL OSBURN STRATFORD
Installation Instructions
This installation manual will help you obtain a safe, efficient, dependable installation for
your fireplace and chimney system. Please read and understand these installation
instructions before beginning your installation.
CAUTION:Do not attempt to modify or alter the construction of the fireplace or its
components. Any modification or alteration of construction may void the warranty,
listings and approvals of this system. In that case, Stove Builder International (SBI) will
not be responsible for damages. Install the fireplace only as described in these
instructions.
PLEASE RETAIN THIS MANUAL
FOR FUTURE REFERENCE
Listed to standards ULC-S610 and UL-127
Manufactured by:
Stove Builder International Inc.
STOVE BUILDER INTERNATIONAL INC.
1700 Leon-Harmel Street, Quebec City, Quebec, Canada, G1N 4R9 Tel.: [phone]
45178 Printed in Canada

TABLE OF CONTENTS Page
1. SAFETY RULES FOR OPERATING YOUR FIREPLACE.......................................1
2. CERTIFICATION LABEL.........................................................................................2
3. THE FIREPLACE.....................................................................................................3
3.1 INTRODUCTION..................................................................................................................3
3.1.1 Parts Required..................................................................................................................3
3.1.2 Additional Equipment (optional) .....................................................................................3
3.2 OPERATING THE OSBURN STRATFORD......................................................................4
3.2.1 Fuel...................................................................................................................................4
3.2.2 The use of manufactured logs..........................................................................................4
3.2.3 First Fires .........................................................................................................................4
3.2.4 Building a Fire..................................................................................................................5
3.2.5 Maintaining the Fire.........................................................................................................5
3.2.6 Primary Air.......................................................................................................................6
3.2.7 Combustion Settings ........................................................................................................6
3.2.8 Smoking − Causes and Troubleshooting..........................................................................7
3.3 MAINTAINING YOUR OSBURN STRATFORD..............................................................9
3.3.1 Creosote............................................................................................................................9
3.2.2 Chimney Maintenance .....................................................................................................9
3.3.3 Top Baffle Removal Prior to Cleaning the Chimney.......................................................9
3.3.4 Dealing with a Chimney Fire........................................................................................10
3.3.5 Plated Finish Maintenance.............................................................................................10
3.3.6 Ashes..............................................................................................................................10
3.3.7 Refractory Replacement.................................................................................................11
3.3.8 Glass Care – Replacement .............................................................................................11
3.3.9 Glass Care – Cleaning....................................................................................................11
3.3.10 Gasket Replacement.......................................................................................................11
3.4 FIREPLACE INSTALLATION.........................................................................................12
3.4.1 Locating the OSBURN STRATFORD..........................................................................12
3.4.2 Heart Extension Requirements.......................................................................................12
3.4.3 Framing, Facing, Mantel, and Combustible Shelf .........................................................13
3.5 HOT AIR DUCTING INSTALLATION...........................................................................17
3.5.1 Gravity Kit .....................................................................................................................17
3.5.2 Central Forced Air Kit (Not tested under EPA certification) ........................................19
3.6 FRESH AIR KIT (Optional)...............................................................................................21
3.6.1 Outside Air Installation..................................................................................................21
3.7 DOOR OVERLAY INSTALLATION...............................................................................22
4. THE CHIMNEY.......................................................................................................23
4.1 CHIMNEY INSTALLATION NOTES..............................................................................23

4.2 CHIMNEY INSTALLATION INSTRUCTIONS.............................................................24
4.3 OFFSET CHIMNEY INSTALLATION..............................................................................26
4.4 ANGLED WALL RADIATION SHIELD.........................................................................29
4.5 CHIMNEY SUPPORT INSTALLATION.........................................................................30
4.6 CHIMNEY CHASE AND MULTIPLE TERMINATIONS ............................................30
4.7 INSTALLATION INSTRUCTIONS FOR MASONRY APPLICATION......................32
5. OPTIONS ...............................................................................................................33
6. APPENDIX.............................................................................................................34
7. OSBURN LIMITED LIFETIME WARRANTY..........................................................35
ii

1. SAFETY RULES FOR OPERATINGYOUR
FIREPLACE
• Use only an Osburn glass door, specifically designed for the model Osburn Stratford.
• When cleaning the fireplace, the ashes should be placed in a metal container with a tight
fitting lid. The closed container of ashes should be placed on a non-combustible floor or
on the ground outside the house, 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.
CAUTION:Never use gasoline, kerosene, charcoal lighter fluid or similar liquids to start or
rekindle a fire in this fireplace. Keep all such liquids well away from the
fireplace at all times.
CAUTION: Keep combustible materials at least 48 inches away from the front of the
fireplace opening.
CAUTION: Never leave children unattended when there is a fire burning in the fireplace.
CAUTION: Never use grate or elevate fire. Build wood fire directly on hearth.
CAUTION: Do not use a fireplace insert and other products not specified for use with this
fireplace.
WARNING: THIS FIREPLACE HAS NOT BEEN TESTED WITH AN UNVENTED OR
VENTED GAS LOG SET. TO REDUCE RISK OF FIRE OR INJURY, DO
NOT INSTALL AN UNVENTED GAS LOG SET INTO THIS FIREPLACE.
PLEASE NOTE THAT THE PICTURES SHOWN IN THIS
MANUAL ARE GENERIC AND MAY NOT MATCH
EXACTLY THE LOOK OF YOUR FIREPLACE.
1

2. CERTIFICATION LABEL
2

3. THE FIREPLACE
3.1 INTRODUCTION
The OSBURN STRATFORD fireplace is an energy efficient, heat circulating, close
combustion fireplace. You will receive a lifetime of comfort and enjoyment from your
fireplace provided it is installed, maintained and operated properly.
• Please read these instructions and retain this manual for future reference.
• Before beginning the fireplace installation, consult the local authorities to obtain your
building permit and check your local building codes. Install the fireplace only as described
in these instructions and using only components from the manufacturers listed in table 2.
• The OSBURN STRATFORD is not intended for use with a gas log. Failure to follow these
instructions will void the certification and the warranty of the fireplace and may result in
an unsafe installation.
3.1.1 Parts Required
• Fireplace model OSBURN STRATFORD
• Insulated chimney made by the manufacturers listed in table 2, with the corresponding
specifications :
−Chimney lengths
−Elbows (where necessary)
−Associated components as per these installation instructions.
3.1.2 Additional Equipment (optional)
• Forced air kit
• Gravity venting system
• Outside air kit
• Fireguard
3

3.2 OPERATING THE OSBURN STRATFORD
3.2.1 Fuel
The OSBURN STRATFORD is designed to work best when fuelled with seasoned cordwood.
Hardwoods are preferred to softwoods since the energy content of wood is relative to its
density. Hardwoods will result in a longer burning fire and less frequent refuelling. A
moisture content of 15% to 20% (seasoned) is recommended. Wood that has been cut and
split and let to dry under a cover for a period of one year will usually meet that criteria.
Excessively wet wood will be difficult to burn and will result in lower efficiency, increased
creosoting and deposits on the glass and in the chimney. Excessively dry wood will burn well
but will also have higher emissions and shorter burning time.
Do not burn scrap or garbage, treated wood or wood such as driftwood from the ocean which
has been exposed to salt or other chemicals. Salt or chemicals can corrode the firebox and
chimney. Do not burn large amounts of paper, cardboard, Christmas tree branches or building
construction materials. Intense firing with these materials may overheat the fireplace, causing
damage to the unit, a fire or even possibly igniting a chimney fire if the chimney is creosoted.
3.2.2 The use of manufactured logs
There are numerous types of manufactured logs sold on the market. You must be very
careful with this type of product. Many brands of manufactured logs contain chemical
additives. DO NOT BURN ANY MANUFACTURED LOGS CONTAINING CHEMICAL
ADDITIVES. If you do, you may overheat you fireplace, therefore causing a fire hazard and
voiding your warranty. Logs containing chemical additives burn a lot hotter and were
designed for decorative fireplaces. Decorative fireplaces generally have larger, cooler, and
less air-tight fireboxes. Your OSBURN STRATFORD, on the other hand, has a smaller,
completely sealed firebox which attains much higher temperatures. It is therefore not
designed to support excessive heat caused by the addition of chemicals in manufactured
logs. Manufactured logs made of 100% wood residues do not pose a threat to your fireplace.
However, they must be used carefully. Manufactured logs typically release a much larger
heat output over a short period of time. Therefore, you cannot place a large quantity of such
logs into your fireplace. Start with one log, and gradually increase the load. Never put more
than 4 logs. The logs should be of an average size and not exceed 8 inches in diameter.
3.2.3 First Fires
The fresh paint on your fireplace needs to be cured to preserve its quality. Once the fuel load
is properly ignited, only burn small fires in your fireplace for the first four hours of operation.
Never open the air control more than necessary to achieve a medium burn rate. Make sure
that there is enough air circulation while curing the stove. Open one or more windows. The
odours can be smelled during the 3 or 4 first fires.
4

3.2.4 Building a Fire
To start a fire, place several crumpled up balls of newspaper in the firebox. Place small dry
pieces of kindling on top of the paper, criss-crossing the kindling so that there are air spaces
in between. Keep the fuel far back enough so that air can get underneath. Open the air
controls fully and light the newspaper. Once the newspaper and the kindling is well ignited,
close the door. Once the kindling fire is well established, cordwood can be added. (See
Primary Air Combustion Control section for proper operation of the air controls.)
The unit will burn best with 2-3 pieces of cordwood spaced 1 to 2 inches apart and allowing
air to get under the fuel. Criss-crossing or arranging the fuel so that air can get underneath,
will help the fire to get started easily. The unit should be operated with the air control fully
open long enough to get the cordwood well ignited
3.2.5 Maintaining the Fire
Once the wood has been consumed (or partially consumed) and you have obtained a good bed
of embers, you should reload the unit. In order to do so, open the air control to its maximum
for approximately 15 seconds prior to opening the fireplace door. Then, proceed by opening
the door very slowly. Open it by 2" to 4" (52 to 104 mm) for 10 seconds before opening it
completely. This procedure will increase the draft and thus eliminate the smoke which is
stagnant in a state of slow combustion in the fireplace. Then, bring the red embers to the front
of the stove and reload the unit.
Your OSBURN STRATFORD fireplace will work best if a thick bed of hot embers is
maintained in the bottom of the firebox, and a minimum of two large pieces of seasoned fuel
are added. Combustion efficiency is largely related to establishing a hot ember bed, and hot
firebox temperatures. The quicker the fireplace and chimney (flue) get up to normal operating
temperatures, the better. A small intense fire is preferred to a large smouldering fire, both to
improve combustion efficiency and to reduce the amount of creosote build-up. The best
performance will be obtained by adding relatively small amounts of fuel to a well established
ember bed, and then operating with the air inlet control open long enough to achieve a hot
fire. Use a poker to make an air channel in the embers below the wood. This will allow air to
flow under the wood for a more efficient burn. Once you have reached the desired
temperature, the primary air can be set to a medium setting. You know you have reached the
desired temperature when, closing the primary air control, you can see a flame at the top of
the firebox. The benefit of this technique will be cleaner glass, less creosoting, greater
efficiency and the most pleasing fire for your enjoyment.
5

3.2.6 Primary Air
There is no flue damper in the OSBURN STRATFORD. As in common with air tight stoves,
the combustion air control sets the flow of air entering the firebox. This allows for a more
precise control of the fire. The combustion air control is located below the door on the right
side. The main source of air (primary air) entering the firebox can be diminished by moving
the air combustion control from right to left. The primary air is fully opened when the air
control is completely moved to the right. The combustion air control should be in the closed
position (primary air) when the fireplace is not in use. This will minimize air leakage up the
chimney. The combustion air control should be opened before opening the door to minimize
the possibility of back draft coming into the room.
SLOW
MEDIUM
ACCELERATED
Figure 1
3.2.7 Combustion Settings
Accelerated Combustion
The maximum heat output for the OSBURN STRATFORD is achieved by burning with the
door closed and the combustion air opened. By this method, the OSBURN STRATFORD can
produce up to 75,000 BTU of heat per hour. However, it will be necessary to reload with
wood every one or two hours. This is the least efficient method of burning the OSBURN
STRATFORD. Use caution when firing with the combustion air control wide open. Only burn
cordwood in this manner. Small dry pieces of softwood and construction scraps will burn very
intensely using this method and may damage the firebox.
6

Medium Combustion
This is the recommended mode of operating the OSBURN STRATFORD and should be the
one normally used since it will deposit the least amount of creosote on the glass and in the
chimney. The combustion air control must be ¾ closed. The precise setting will depend on
many factors, including chimney length and the moisture content of the wood.
For instance, a long chimney will necessitate closing the combustion air control. To obtain the
proper combustion, close the combustion air control completely, then open it about ¼" to ½".
Three medium size pieces of wood should be burning on a bed of hot coals. The heat output
will be approximately 35,000 BTU per hour and the loading time will be about every 3-4
hours. Softwoods may be burned using this method but the time will be substantially reduced.
Slow Combustion
When the air combustion control is completely closed, the fireplace is in a slow combustion
phase. If the heart is hot enough, slow combustion will not stop the fire, but there will be a
noticeable change in the flame pattern. The flames will be slow and may appear dirty if the
wood is too wet (moisture content of 20% and more). Do not allow the wood to burn without
flame, since this will produce excessive creosote in the unit.
Creosote may accumulate on the glass door. This method of burning should be used only after
operating the OSBURN STRATFORD with the air control opened to produce a hot fire for
about an hour or at medium pace for at least 2 hours. Slow combustion can be used at night in
order to reduce the heat output and to prolong the burn. The refuelling interval time will be
between 6-8 hours.
3.2.8 Smoking − Causes and Troubleshooting
To reduce the likelihood of smoking when opening the door, set the combustion air controls
to the right (accelerated) before opening the door. Your fireplace has been designed and tested
to provide smoke free operation. Occasionally, there may be a small amount of smoking upon
lighting the fire, until the chimney heats up but this should not continue. If the fireplace
continues to smoke it is probably for one of the following reasons:
A. Negative pressure in the house
As the fire burns, air goes up the chimney. This air must be replaced through leakage into
the house or through the fresh air kit. When operating the OSBURN STRATFORD, open a
nearby window temporarily to check if there is adequate air supply replacement. If
opening a window solves the problem, the house is under negative pressure.
B. Fans operating (e.g. : range hood)
These fans draw air out of the house and may actually cause a negative pressure in the
house. Turn off all fans and open a nearby window to determine if this is the cause of the
problem.
7

C. Wet wood
Wet or tarred wood will smoulder and smoke instead of burning properly.
D. Dirty or blocked chimney
Check to make sure the chimney is clear and clean.
E. Chimney not long enough
The minimum chimney height is 15 feet (4.6m). not including the fireplace’s height. The
chimney must extend at least 3 feet (915 mm) above its point of contact with the roof and
at least 2 feet (0.6 m) higher than any roof or wall within 10 feet (3 m) of it. When
installed with offsets, the minimum chimney height is 15 feet (4.6 m). Additional height
will increase draught and will decrease the tendency to smoke.
F. Poor chimney draft
With no fire, there should be sufficient draught to exhaust cigarette smoke introduced
under the baffle. Chimneys installed against an outside wall without protection may
generate back draught problems which will cause start-up problems. To prevent this, open
a nearby window, roll up a piece of paper and light it. Then, hold it in the upper part of the
firebox to warm up the chimney. Wait until the draught is sufficient, then start the fire.
IMPORTANT NOTES
A. Do not block the hot air vents to the fireplace as this will cause the fireplace to overheat.
B. Never start a fire using gasoline, kerosene, charcoal lighter fluid or any other combustible
liquid.
C. Do not burn coal. The sulphur in coal will corrode the firebox.
D. Do not burn driftwood which has been in the ocean or salt water. The salt will corrode the
firebox and chimney.
E. Do not abuse the unit by burning paper, or cardboard or construction material such as
pressed wood, plywood or lumber.
F. Do not allow the wood to smoulder or burn without flame, since this will produce
excessive creosote in the unit.
8

3.3 MAINTAINING YOUR OSBURN STRATFORD
3.3.1 Creosote
When wood is burned slowly without a flame, it produces tar and other organic vapours
which combine with expelled moisture to form a black deposit called creosote. Creosote
accumulates on the flue lining. When ignited, this creosote makes an extremely hot fire. If the
creosote accumulation is large, a creosote fire in the chimney can damage the chimney and
overheat the surrounding wood framing. Creosote formation in a chimney can be minimized
by making sure there is always visible flame burning, avoid smouldering fires and by proper
refueling techniques.
3.2.2 Chimney Maintenance
Regular chimney inspection and maintenance combined with proper operation will prevent
chimney fires. Keep your chimney clean. Do not allow more than 1/16″creosote build up in
your chimney. The amount of creosote will depend on variables such as frequency of use and
type of fire. We recommend that you:
A. Initially inspect the chimney system weekly. From this, you will learn how often it
will be necessary to clean your chimney.
B. Have your chimney cleaned by a qualified chimney sweep. If you wish to clean it
yourself, we recommend using a stiff plastic or non-metallic brush. If a metal brush is
used, its size should be slightly smaller than the flue to avoid damaging the chimney.
Do not use a brush that will scratch the stainless steel interior of the chimney.
C. Do not expect chemical cleaners to keep your chimney clean. The rain cap can be
removed for inspection and/or cleaning of the chimney.
3.3.3 Top Baffle Removal Prior to Cleaning the Chimney
Before starting to clean your chimney, we recommend that you remove the top baffle to avoid
creosote dust collection at the top of the baffle. Follow these steps to set the top baffle out of
the way:
1. Remove the front air tube by pulling out the cutter pin on the side of the tube. They are
located at the top, underneath the baffle.
2. Lift the baffle and slide it out of the fireplace. You now have access to the chimney.
9

Figure 2
3.3.4 Dealing with a Chimney Fire
FRONT AIR
TUBE
Regular chimney maintenance and inspection can prevent chimney fires. If you have a
chimney fire, follow these steps:
1. Close the fireplace door and the combustion air controls;
2. Alert your family of the possible danger;
3. If you require assistance, alert your fire department;
4. If possible, use a dry chemical fire extinguisher, baking soda or sand to control the fire.
Do not use water as it may cause a dangerous steam explosion;
5. Check outside to ensure that sparks and hot embers coming out of the chimney are not
igniting the roof;
6. Do not use the fireplace again until your chimney and fireplace have been inspected by a
qualified chimney sweep or a Fire Department Inspector;
3.3.5 Plated Finish Maintenance
Use a glass cleaner and a soft cloth to polish the plated finish on the door frame. Do not use
abrasives such as steel wool, steel pads or an abrasive polish for they may scratch the finish.
3.3.6 Ashes
Remove ashes only when the fire is out and the ashes are cold (24 to 48 hours after the fire
is out).
10

3.3.7 Refractory Replacement
The intense heat of the fire will normally cause hairline cracks in the refractory. These cracks
can be minimized by proper curing as described in “First Fires”. They will not normally
diminish the effectiveness of the refractory. If large cracks develop, then the refractory should
be replaced. To replace the refractory bricks, follow these steps:
1. Remove the left side bricks
2. Remove the right side bricks
3. Remove the back bricks
4. Remove the two floor bricks
To install the new bricks, follow the
above steps in reverse.
14
2
3
4
Figure 3
3.3.8 Glass Care – Replacement
The glass used for the OSBRUN STRATFORD is a high temperature ceramic glass (1400º F).
If the glass breaks, it must be replaced with an identical ceramic glass. Tempered glass or
ordinary glass will now withstand the high temperatures of the OSBURN STRATFORD.
Replacement glass should be purchased from a Osburn dealer (see “Replacement Parts”, in
Section 7 – APPENDIX). Do not operate the unit with a cracked or broken glass.
3.3.9 Glass Care – Cleaning
The OSBURN STRATFORD is designed to keep the glass clean under normal operating
conditions. If the OSBURN STRATFORD is operated continuously with the combustion air
controls closed, the glass will tend to get dirty unless the fuel, firebox and glass are
maintained at hot. To clean the glass, there are a number of specially designed cleaners. Your
authorized Osburn dealer can recommend a suitable cleaner which is available in your area.
Regular household glass cleaners will not clean creosote. Do not use abrasives such as steel
pads, steel wool or oven cleaner as they will scratch the glass.
3.3.10Gasket Replacement
Remove the doors from the unit and lay them on a clean, unabrasive surface. To replace the
gasket around the door frame, first remove the old gasket and adhesive. Make sure that the
surface is totally clean before applying new adhesive (a high temperature silicone caulking
11

rated for at least 500ºF, 260ºC, is suitable) or adhesion problems may result. Apply the
adhesive inside the door groove (gasket channel) and install the new gasket with a gentle
pressure. Let dry for at least 24 hours. To replace the glass gasket, simply remove the glass
retainers holding the glass to the door frame. Remove the glass and peel off the gasket
surrounding it. Replace it by a new, self-adhesive glass gasket. The proper replacement
gaskets are available from your Osburn dealer in the following dimensions:
Gasket Length Dimensions
Around each glass 51 ½" (131 cm) U SHAPE
On each door frame 41 ¼" (105 cm) Flat ¼" x ½"
Along the door joint 14" (36 cm) Flat ¼" x ½"
3.4 FIREPLACE INSTALLATION
3.4.1 Locating the OSBURN STRATFORD
A. The best location to install your fireplace is determined by considering the location of
windows, doors, and the traffic flow in the room where the fireplace is located, allowing
space in front of the unit for the heart extension and the mantel, and taking into
consideration the location of the hot air ducts (optional), outside air kit and chimney. If
possible, you should choose a location where the chimney will pass through the house
without cutting floor or roof joists.
B. Usually, no additional floor support is needed for the fireplace. The adequacy of the floor
can be checked by first estimating the weight of the fireplace system. Weights are given in
the appendix. Next, measure the area occupied by the fireplace which is normally 36" ×
26". Note the floor construction and consult your local building code to determine if
additional support is needed.
C. The OSBURN STRATFORD may be installed directly on the floor or on a raised base (for
proper guidelines, refer to “Heart Extension Requirements”) and a minimum of 7 feet
(2.15 m) measured from the base of the appliance to the ceiling is required.
3.4.2 Heart Extension Requirements
The OSBURN STRATFORD may be installed directly on a combustible floor; however, the
combustible floor in front of the fireplace must be covered with a non-combustible material
(tile, marble, stone, etc.). The hearth extension floor area shall extend at least 16" in front and
at least 8" on each side of the fireplace opening. (see figure 4). If the fireplace is to be used with
a fireguard, the floor protector in front of the fireplace must have a R value of 1.53 or greater.
12

41 3/4"
16"
3"
45°
50" MIN.
6.000" 17" MIN.
COMBUSTIBLE
SHELF
AREA WHERE
WOOD MANTEL
CAN BE INSTALLED
NON COMBUSTIBLE
MATERIAL
Figure 4
3.4.3 Framing, Facing, Mantel, and Combustible Shelf
The construction of the framing, facing, and mantel must be in accordance with the standards
and the following illustrations (figures 4 to 11):
A. Frame the fireplace using 2" × 3" or heavier lumber.
B. WARNING:Combustible framing material cannot be used in the space directly above the
fireplace, except for the studs above the facing that support the facing material and
mantel. This area must remain empty for a height of 7′(2,15 m) measured from the base
of the appliance.
C. Frame the fireplace with vertical studs at the sides of the fireplace running from floor to
ceiling (see figure 6). Position the studs back from the front edge of the fireplace, a space
the thickness of the facing material so that the facing can be installed flush with the
fireplace facing (within limitations of figure 11). Frame headers between the vertical studs
only as follows:
− Place 2" × 3" or 2" × 4" headers, only along the upper part of the front, side and back
faces. Do not put wood or any combustible material within the area above the fireplace
except on the front facing.
− Place headers only as required to support the facing and mantel.
D. WARNING: The fireplace must not be in contact with any insulation or loose filling
material. Cover the insulation with gyproc panels around the fireplace.
13

Figure 5 Figure 7
Figure 6 Figure 8
INSULATED CHASE CONSTRUCTION
37 31/32"
19 13/16"
53 23/32"
75 31/32"
20"
10 1/4"
12 13/32"
24 1/32"
1 1/2"
2"
22 7/8"
8 3/32"
36"
26"
7' MIN.
43 3/16"
36"
24 1/32"
43 1/4"
36"
38 1/32"
14

2" X 4"
GYPROC
7 MIN.
1/2" PLYWOOD
FIRESTOP
FOYER
ATTIC
RADIATION
SHIELD
ROOF SUPPORT FLASHING
STORM COLLAR
NOTE:
FLOOR AND WALL BELOW THE ATTIC
MUST BE INSULATED USING THE SAME
INSULATION.
MUST HAVE THE SAME FIRESTOPPING RESISTANCE
AS ADJACENT WALL.
MUST HAVE THE SAME INSULATION AS ADJACENT
CEILING.
FOLLOW LOCAL RULES REGARDING FRAMING
CONSTRUCTION.
FLOOR /
CEILING WALL
Figure 9
Facing
1. Combustible material may be installed flush with the fireplace decorative frame.
Combustible material may not project in front of and onto the fireplace decorative
frame (figure 11).
2. Non-combustible materials such as brick, stone or ceramic tile may project in front of
and onto the fireplace decorative frame.
15

Combustible shelf
Any combustible shelf must be installed at least 50" (127 cm) above the base of the fireplace
if the depth of the shelf is 6" or less. If the depth of the shelf is more that 6" but less that 12",
the shelf must be installed at least 52" (132 cm) from the base of the fireplace (see figure 10).
12
52
6"
50"
Figure 10
SPACER
COMBUSTIBLE
FACING 1/2" GYPROC
2" X 4"
Figure 11
16

3.5 HOT AIR DUCTING INSTALLATION
Different hot air ducting systems can be installed with the OSBURN STRATFORD:
− Gravity kit
− Forced air kit
3.5.1 Gravity Kit
The kit includes:
−2 x hot air outlets (grilles and frames);
−2 x 90oelbows with brackets;
−1 deflector.
The gravity kit allows you to block the upper fireplace louver. To do so, follow the steps
below:
a) Remove the upper louver from the fireplace;
b) Install the deflector as shown on figure 12;
c) Put the upper louver back into place.
Figure 12 Figure 13
DEFLECTOR
UPPER
LOUVER
GRILLE
FRAME
The safety rules for hot air ducting gravity kit installations are the following:
Minimum height* 68" (1.7 m)
Maximum length 10' (3m) (see figure 14)
*The minimum height of the hot air ducting must be measured from the floor to the top of the
hot air grilles.
The hot air grilles can be installed in the same room as the fireplace, or one or both of the
grilles can be installed in adjacent or upper rooms. Installing the ducts at different elevations
will tend to exhaust more heat out of the higher grilles (figure 15).
17