MHSC SB38 User manual
87D0057 5/10 Rev. 6
SB38 / SB44 Series Woodburning Fireplace
87D0057
You have chosen the finest wood burning fireplace available. Your fireplace has been designed for years of heating and
viewing enjoyment. Please take time to read this entire manual before installing or operating your fireplace.
The instructions contained in this manual provide the information necessary to install this fireplace in
accordance with Underwriter’s Laboratories requirements and in compliance with the National Fire
Protection Association Standard No. 11. Some codes may require the fireplace and chimney be
electrically grounded. Before beginning the installation, you should check with local building officials
to obtain required permits and assure compliance with local regulations and coded. If you encounter
problems with code requirements, contact your dealer for assistance.
These Fireplace models are listed by Underwriters Laboratories, Inc. to U.L. 17-standard for factory-
built fireplaces. The design of this fireplace and these instructions complied with applicable safety
standard for a factory built fireplace in effect at the time the fireplace was manufactured. You should
be aware, however, that failure to install, operate, and maintain this or any other factory built fireplace
properly can result in a house fire or other occurrences that could cause deaths, injuries, and property
damages. It is very important that the persons installing and/or supervising the installation of this fireplace
have appropriate skills in using the tools and techniques required; and reading and comprehension
skills sufficient to read and follow these instructions. These instructions contain warnings, cautions, and
notes to emphasize important safety information. To assure that safe and satisfactory service is received
from this fireplace, please read the following special notices and all the contents of this manual.
Listing and Code Approvals ................................................................................................
Safety Information ..............................................................................................................3
Important Information .........................................................................................................4
Operation Guidelines ..........................................................................................................5
Fireplace Dimensions .........................................................................................................6
Clearances ........................................................................................................................7
Fireplace Location .............................................................................................................9
Installation Preparation ..................................................................................................... 11
Floor Protection ...............................................................................................................13
Mantel Clearance .............................................................................................................15
Fireplace Components .....................................................................................................17
Fireplace Installation .........................................................................................................18
Chimney Installation .........................................................................................................19
Chimney Offset Installation ...............................................................................................1
Chimney Cap Installation ..................................................................................................3
Chimney Cap Chase Installation ......................................................................................5
Outside Combustion Air Precautions and Recommendations .......................................... 6
Combustion Air Assembly .................................................................................................8
Gas Appliance Installation ...............................................................................................9
Trim and Door Installation ................................................................................................31
Fireplace Operation .........................................................................................................33
Maintenance and Safety ..................................................................................................34
Replacement Parts ...........................................................................................................37
Warranty ...........................................................................................................................39
SB38 / SB44 Series Woodburning Fireplace
87D0057 3
Read all instructions and warnings carefully before starting installation. Failure to fol-
low these instructions may result in a possible fire hazard and will void the warranty.
MHSC fireplaces and component parts have been highly tested and will operate safely when installed
in accordance with instructions provided in this manual. Carefully read and understand all instructions
beginning installation.
If you notice any damage to fireplace or component parts, immediately report damage to your MHSC
dealer.
Only use MHSC components or the warranty will be voided and a fire hazard may be created.
MHSC warranty will be voided by and MHSC disclaims any responsibility for the following actions:
•
•
•
•
•
Consult local building codes to ensure that you are in compliance installing the fireplace.
Fireplaces must be vented to the out-of-doors.
: Do not pack required air spaces with combustible material or insulation not specifically
recommended for use in such areas.
The fireplace should not be located in areas that create drafts (ie: frequently opened doors and central
heating air inlets/outlets) that hamper the normal flow of air into the fire.
If you plan to install a gas log, the gas line should be installed before framing the fireplace. The gas line
must be installed by a certified gas line installer.
Fuels used in gas, wood-
burning or oil fired appliances, and the products of
combustion of such fuels, contain chemicals known
to the State of California to cause cancer, birth de-
fects and other reproductive harm.
California Health & Safety Code Sec. 549.6
SB38 / SB44 Series Woodburning Fireplace
487D0057
1. Read these instructions entirely before beginning any part of the installation. Save these instructions
for any future repairs.
. Use these instructions as a guide during the installation of the fireplace.
3. Be sure these instructions become the property of and are reviewed by all future users of this fireplace
to encourage proper operation and maintenance.
4. All the parts used with this fireplace system must be installed in accordance with these installation
instructions. Failure to do so may be hazardous and will void the warranty.
5. This fireplace and accessories should not be altered in any way that is not specifically recommended
in this manual.
6. Refer to your local building code for local requirements pertaining to installation of factory-built
fireplaces. These fireplaces are intended for installation and use according to standard NFPA No.11
of the National Fire Protection Association.
7. This fireplace must not be installed with a masonry flue.
8. This fireplace and chimney should not be used for venting a wood or coal burning heater or fireplace
insert.
The fireplace is designed to sit directly on a combustible floor. The fireplace must be installed with
clearances to combustible building materials specified in this manual. Only parts manufactured by MHSC
and labeled for use with the fireplace should be used in the installation of this fireplace except for special
roof flashings that may be fabricated locally. The use of improper parts in the installation can be hazardous
and voids the warranty offered by MHSC.
This fireplace is designed to burn wood. This fireplace is not designed to burn coal, unplumbed liquid
fuels, unplumbed gaseous fuels or household refuse. Any attempt to burn these fuels in the fireplace
can be hazardous.
Failure to heed usuage warnings may cause a fire hazard and will void the Warranty. This fireplace is
intended for supplemental heating only and is not intended for use as a primary heating system. For
use with Solid Wood Fuel, UL Classified Processed Solid Fuel Fire Logs, or Certified Decorative Gas
Appliance.
Improper installation or use of this fireplace will void the warranty and can cause:
1. Damage to the fireplace from overheating.
. Hazardous temperatures to develop on combustible materials adjacent to the fireplace or
chimney.
3. The emission of smoke, sparks or hazardous gases into the dwelling.
4. Leakage of rain water into the dwelling.
SB38 / SB44 Series Woodburning Fireplace
87D0057 5
When an AK4 combustion air assembly and a combustion air duct are attached to the connecting point
on the left of the fireplace, combustion air may enter the firebox through a dampered opening behind
the left side panel. This feature is designed for your benefit to reduce the room air used for combustion
and to prevent excessive loss of heat from the room. When the fireplace is in use, this damper should
be open. When the fireplace is not in use, the damper should be closed to prevent cold air from entering
the firebox. The combustion air damper is open when the lever, located on the left side of the firebox
near the top of the left firebrick, is up and closed when the lever is down.
Outside air for combustion is optional unless required by federal, state or local building codes. See the
section of this manual providing the instructions for installation of the combustion air assembly. The
design of the fireplace allows the routing of the combustion air duct up, down, or horizontally to obtain
the outside combustion air. This permits flexibility in planning your installation. Refer to Page 21 for
typical installation methods. Review the precautions and recommendations in this manual pertaining
to outside combustion air installation.
Glass doors should be installed to receive the maximum benefit from your fireplace. For large fires, the
maximum heating benefit from the fireplace will be obtained with the doors open due to the high amount
of radiant heat being emitted out of the front opening of the fireplace. With a small fire, or before retiring
in the evenings, it is best to operate the fireplace with the doors closed to prevent excessive room air
from being drawn up the chimney. When the doors are open, the mesh screens should be closed to
help keep burning embers from popping out of the firebox.
The fireplace should also be equipped with a flue damper, which must be open when the fireplace is
in use. The flue damper control lever is located inside the fireplace. The counterweighted damper is
operated by simply pushing up to open or pulling down to close the damper. When the fireplace is not
in use, the damper should be closed to prevent cold air form entering the chimney as well as preventing
warm air in the room from escaping up the chimney.
It is normal for a small amount of smoke to be released from the upper portion of the fireplace
the first few times you use your new fireplace. This results from an oil residue on the metal. Open a
door or window to allow the smoke to escape.
The grate included with this fireplace helps to appropriately locate and contain the burning wood. Failure
to use this grate may cause overheating of parts of the fireplace and allow large pieces of burning wood
to roll forward out of the firebox. If the grate becomes warped or damaged, it must be replaced with
grate number 050499 for the SB44/44HB; 05874 for the SB38/38HB.
Fireplaces equipped with doors should be operated only with the doors fully open or doors
fully closed. If doors are left partly open, gas and flame may be drawn out of the fireplace opening,
creating risks of both fire and smoke.
All fireplace chimneys are in direct contact with cold air on the exterior of the structure. Consequently,
when the fireplace is not in use, cold air can fall down the chimney of the fireplace to cool off the fireplace
chase. Therefore, the fireplace chase must be insulated to minimize the risk of cold air infiltration to
the home. Even if the fireplace chase is adequately insulated, this cannot completely ensure that cold
air infiltration into the structure will be eliminated. Cold air infiltration is a possibility with any fireplace
or device that freely communicates with the air on the outside of the structure. Today’s homes are
more energy-efficient and, therefore, better insulated and tightly constructed. Unfortunately, when air
is removed from the house, as by a bathroom fan, or consumed by a furnace, additional air is needed
to replace the air consumed. Unless the additional air is supplied, this can cause a negative pressure
in the home. When this happens, the house will draw in outside air form the cracks in the windows,
down the fireplace flue or other locations of air leakage in the home. Because cold air infiltration may
be unavoidable in some structures, MHSC is not responsible for heat loss or air infiltration through or
around the fireplace.
SB38 / SB44 Series Woodburning Fireplace
687D0057
28”
96M”
266”
166”
9/16”
46QE”
46QE”38”
4756”
1/8”
66”
1156QE”
27”
856QE”
3556”
52(6”
106QE” 8(6”
116”
1556:O”
Figure 2
SB44 / SB44HB
34”
96M”
166”
266”
9/16”
44”
5356”
856QE”
27”
1156QE”
66”
1/8”
3556QE”
52(6”
106QE”8(6”
116”
1556:O”
46QE”
46QE”
11” ID Flue
13” OD Outer Pipe
Gas Line Opening
Outside Air Opening
Figure 1
SB38 / SB38HB
Gas Line
Opening
Outside Air
Opening
11” ID Flue
13” OD Outer Pipe
Required 1Z\x”
Air Space
Required 1Z\x”
Air Space
SB38 / SB44 Series Woodburning Fireplace
87D0057 7
Figure 3
476”
5356”
Chimney Cap
Roof Flashing
Flue Outlet Height to Floor
Storm
Collar
15 ft. = Min. Height (No offsets)
15 ft. = Min. Height ( 30° Elbows)
1 ft. = Min. Height (4 30° Elbows)
86 ft. = Max. Height (Chimney sup-
port every 5 ft.)
Chimney Sections
Maintain ” Minimum Air
Space Between Chim-
ney and Combustibles
Flexible Duct
Type FP-4-U
Combustion Air
Assembly
Nail to Framing Members
Galvanized Metal Strip
Do Not Restrict
Side Air Inlet Vents with Sur-
round or Trim Materials
Floor Line
Top Spacer
Firestop
FP1875
SB38 / SB44 Series Woodburning Fireplace
887D0057
5356O”
536”
Chimney Cap
Roof Flashing
Chimney Section
Maintain ” Min. Air
space between Chimney
and Combustibles
Flexible
Duct Type
FP-4-U
Combustion
Air Assembly
FP36
Nail to Framing
Members
Galvanized Metal Strip
Do not restirict
side air inlet vents with sur-
round or trim materials
Storm Collar
Flue Outlet Height to Floor
15 ft. = Min. Height (No offsets)
15 ft. = Min. Height ( 30° Elbows)
1 ft. = Min. Height (4 30° Elbows)
86 ft. = Max. Height (Chimney
Support every 5’)
Floor
Figure 4
Firestop
SB38 / SB44 Series Woodburning Fireplace
87D0057 9
This fireplace does not weigh more than large pieces of furniture and can normally be located near a
load bearing wall without requiring additional foundations or supports. If however, the fireplace is to
be trimmed with a heavy stone or brick facing and hearth extension, be sure the supporting structure
is adequate.
Figures 5, 6 and 7 provide dimensional details of the fireplace, required spacing to combustible walls,
and some suggested fireplace locations. When selecting a location, choose one that is away from
frequently opened doors, central heat outlets or returns, or other places where air movements may
disturb the airflow around the fireplace. Air turbulence near the fireplace may cause smoke to spill out
of the fireplace opening.
6456QE” Min.
536”196”
Min.
926” Min.
196”
Min.
**16"
Min.
156O”
Air Space
Clearance
27(6”
Min.
2356O" Min.
*28” Min.
*Applies when Glass Doors are not installed
**Applies when Glass Doors are installed
Figure 6
606M” Minimum
196”
Min.
476”
85(6” Minimum
196”
Min.
27(6”
Minimum
2356O” Min.
*28” Min.
**16”
156O” Minimum Air Space Clearance
*Applies when Glass Doors are not installed
**Applies when Glass Doors are installed
Figure 5
FP37
FP1879
SB38 / SB44 Series Woodburning Fireplace
10 87D0057
Figure 7
Corner
Full Protection
Flush
FP0
A
B
C
SB38/38HB 36” (914 mm) ” (559 mm) 0” (508 mm)
SB44/44HB 4” (1067 mm) 8” (711 mm) 0” (508 mm)
Figure 8
FP1531
SB38 / SB44 Series Woodburning Fireplace
87D0057 11
Figure 9
8’ 0”
Level
Joist - Insulate
Same as Ceiling
Refer to Notes
Firestop Spacer
Solid
Surface
Chimney Cap
Flat Chase
Top Flashing
Chimney
Section
Insulate Outside
Walls of Chase
Solid Continuous
Surface
Insulation
(Thermal Barriers)
Outside Base
FP1880
1. Firestop spacer must be used.
. Local codes may not require A
firestop at the ceiling level for chase
installation, but it is recommended
for safety and reducing heat loss.
3. Do not insulate the chase with blown
or fill type insulation. Insulation
should only contact the fireplace at
points where the fireplace would nor-
mally be contacted by framing mate-
rials.
Survey the planned location for the fireplace for overhead plumbing or electrical wires, etc., that might
complicate the installation or endanger persons installing or cleaning the chimney. Avoid a location
where the chimney cap will be near abrupt changes in the roof shape, nearby wall or embankments,
under or near trees or above the roof of a single story wing of a two story building. Figure 11. All
these conditions can cause turbulence or pressure conditions that can cause poor chimney draft
and smoke spillage from the fireplace opening. Elbows may be used to offset the chimney to avoid
obstructions or to locate the chimney cap in a preferred location. Refer to the sections of this manual
pertaining to chimney offsets for instructions on proper elbow use. Poor installation or location of
the chimney cap and/or components can cause wind blown rain to enter the chimney.
Be sure the selected location will allow a 17” square combustible material-free space for the chimney
to pass through. If the chimney is to pass through living or storage spaces, be sure there is adequate
space to enclose the chimney to avoid personal contact with, or damage to, the chimney. If the
fireplace is to be installed on an outside wall, the surrounding walls (chase) should be constructed
and insulated as shown by Figure 9. Failure to insulate the fireplace form outside temperatures will
cause heat loss through and around the fireplace.
SB38 / SB44 Series Woodburning Fireplace
1 87D0057
18’ Min.
Chimney Cap
Storm Collar
Flashing
Flue Outlet Height
3’ Min. or ’ Above
any Point within 10’
See Table
1 for Roof
Opening Size
Attic Space
Firestop Spacer
(” Air space
Clearance to
Combustibles)
Chimney
Sections
17”
Square
Opening
in Joist
FP1881
Figure 10
Figure 11
Preferred Location
Poor Location
FP188
3 ft. Min.
Figure 12
Chimney Cap
Storm Collar
(Included with cap)
Flashing
See Table 1 for
Roof Opening
Size
Attic Space
Firestop
Spacer (”
Air Space
Clearance to
Combustibles)
” Clearance to
Combustibles (Min.)
17” Square
Opening in
Joist
Third Floor
Area
Second
Floor Area
First Floor
Area
Flue Outlet Height
17” Square
Opening in
Joist
17” Square
Opening in Joist
Firestop
Spacer
Firestop
Spacer
FP1883
that you insulate the fireplace enclosure to
eliminate cold air penetration as much as possible.
Insulate base of fireplace with a noncombustible insulation
rated for a minimum of 300° F. Insulating is very important
for outside wall installations over a concrete slab. If fire-
place is installed on a platform, insulation should be placed
on top of the platform before fireplace is set. Figure 9
When a fireplace is installed in a chase or on an outside
wall, enclosure should be treated like any outside wall in
a home. Insulation should be installed on the inside wall
as well as the outside wall(s). In a chase, it is also a good
idea to install a firestop at the first ceiling level above the
fireplace and enclose the chase with sheeting material.
Insulation may then be installed above sheeting material to
assure the space around the fireplace is totally protected.
Figure 9
Figures 10 & 12
” Minimum Clear-
ance to Combus-
tibles
SB38 / SB44 Series Woodburning Fireplace
87D0057 13
If this fireplace is installed on a combustible floor, the floor area 0 inches in front of, and 1 inches
either side of the fireplace opening must be protected by an insulating noncombustible hearth exten-
sion. This hearth extension may be either minimum 6-inch thick stone or brick as shown by Figure
13, an H068 hearth extension kit or a locally constructed equivalent to the H068.
The H068 hearth extension kit consists of sufficient insulation board to cover the floor area with
1/” inch layer of insulation. A piece of galvanized steel is included in the kit to cover the insulation
before a finishing layer of noncombustible material of stone, brick, tile, etc., is applied to finish the
hearth extension.
The insulation used in the H068 hearth extension has a thermal conductivity (K factor) of 0.43. If
you do construct a hearth extension equivalent to the H068, be sure the insulation you use has
enough compressive strength to support the weight of the covering materials and persons standing
on it, and insulating qualities equal to or better than the 1/” covering provided by the H068.
Figure 15
Figure 13
12”
Min.
6” Min.
20” Min.
12”
Min.
Hearth
Safety Strip is Re-
quired When Unit
is Placed on a
Combustible Floor
or Platform
Brick or Stone Hearth Extension
- SB38/38HB 6” Long Min.
- SB44/44HB 68” Long Min.
Alternate brick or stone hearth
extensions for use with the SB38/
SB44 Series fireplace when
placed over a combustible floor
without insulation board protec-
tion.
FP38
12” 12”
20”
Screened Opening
FP39
Minimum Hearth Extension Dimensions
A hearth extension placed on a
combustible floor must be constructed
with rigid insulation which has a mini-
mum “R” value of 1.16 or a “K” value of
0.43. The insulation must be covered
with a noncombustible covering such as
a tile, stone, marble, or a piece of 0.018
minimum sheet metal which is needed
to protect the insulation. Follow instruc-
tions provided with the for all other
specifications and directions for proper
installation of the fireplace and hearth
extension.
Do not
place finishing materials
beyond these edges or
cover air inlets
Screen
Rail
Hearth
FP1168
Figure 14
SB38/38HB - 6” Min.
SB44/44HB - 68” Min.
SB38 / SB44 Series Woodburning Fireplace
14 87D0057
The ability of insulating material to retard the transfer of heat may be expressed as either Thermal
Conductance (C), Thermal Conductivity (K), or Thermal Resistance (R). The mathematical re-
lationship of these values and the formulas for converting one value to another is as follows:
C= K divided by the material thickness
(Example C = .43 divided by 1/ (.50)
C = .86)
K = C multiplies by the material thickness
(Example K = .86 multiplied by 1/ (.50)
K = .43)
R= The material thickness divided by K
(Example R = 1/ (.50) divided by .43
R = 1.16)
With either type hearth extension minor shifting of the supporting floor or expansion and contrac-
tion may eventually cause a crack to develop between the hearth extension and the face of the
fireplace. To help prevent the crack from developing, the hearth extension materials must be
firmly fastened in place. Wall ties should be screwed to the face of the fireplace and imbedded
in the mortar joints of brick, stone, or other noncombustible materials. The metal safety strip
packed with the fireplace must be placed beneath the fireplace and extended under the hearth
extension or into a mortar joint of the hearth extension as shown by Figures 13, 16 & 17. In the
event a crack does eventually develop, the metal safety strip will serve as a barrier to prevent
sparks or embers from falling from the fireplace onto combustible flooring materials.
Figure 17
266”
20”
Figure 16
FP39
Metal Safety
Strip
Combustible
Floor
12”
Min.
12”
Min. 20” Min.
Top of Raised
Hearth Floor Line with Raised
Hearth
Hearth Extension Metal Safety
Strip
FP40
The hearth extension and the
metal safety strip should be installed only
in a horizontal relationship to the fireplace. SB38/38HB - 6” Min.
SB44/44HB - 68” Min.
SB38 / SB44 Series Woodburning Fireplace
87D0057 15
Finish the wall with material of your choice.
Figure 18. If a combustible ma-
terial is used below a flat mantel shelf, consult your local building codes for minimum clearance
from top of fireplace opening to bottom of mantel shelf.
All joints (top, bottom and sides) where wall or decorative facing material meets fireplace sur-
round must be completely sealed with a noncombustible material. Figure 19
156O"
Ref.
*
* *
MA81
Figure 18 -
Combustible Mantel Clearances
Face Plate
SB38 / SB44 Series Woodburning Fireplace
16 87D0057
12"
(305mm)
Max.
12"
(305mm)
min.
*
156O"
12"
(305mm)
Max.
12"
(305mm)
min.
156O"
6"
(159mm)
Min.
3/4"
FP683
Figure 19 -
Mantel Clearance
Header
Must be sealed with non-
combustible material
Surround
Face
Finished Wall
Ledge Bracket
Finished Wall
Ledge Bracket
Combustible
Mantel and Trim
Fireplace Opening
* Minimum width from
top of surround to bottom
of screen rail
Noncombustible
Material
Combustible
Mantel and Trim
Finished Wall
Header
Ledge Bracket
Noncombustible
Material
Surround
Face
Noncombustible Facing
Material
Fireplace Opening
x 4 Stud
Finished Wall
Must be sealed with
noncombustible
material
SB38 / SB44 Series Woodburning Fireplace
87D0057 17
FP2225
SB6000 fireplace components
SB38 38” front opening fireplace. Includes firescreen, sealing flue damper and outside combustion air capa-
SB38HB bility. When installed, outside combustion air can be connected to either left or right side. Refer to
installation instructions for details. HB models have herringbone pattern firebrick.
SB44 44” front opening fireplace. Includes firescreen, sealing flue damper and outside combustion air capa-
SB44HB bility. When installed, outside combustion air can be connected to either left or right side. Refer to
installation instructions for details. HB models have herringbone pattern firebrick.
11CF1 1” chimney section
11CF18 18” chimney section
11CF3 36” chimney section
11CF4 48” chimney section
11CF30- 30° elbows (package contains two 11” diameter elbows) One pair is required for each offset.
11CS Chimney support (required when chimney height exceeds 30 feet)
SLTCF11 Chimney cap for contemporary installations.
RLTCF11 Round chimney cap for contemporary installations.
RLTCF11L Extended chimney cap for contemporary installations.
8-6-1 0-6/1 pitch flashing for contemporary installation.
8-1-1 6/1 to 1/1 pitch flashing for contemporary installation.
FSA Vertical Firestop spacer - One required at each ceiling or floor level.
FS6A 30° Firestop spacer - for 30° chimney incline through ceiling or floor.
FP-4-U 4” insulated combustion air duct, 8’ length.
403 4” duct connector (for splicing FP-4 ducts). Includes clamps.
AK4 4” outside combustion air assembly.
WSB54 Optional polished brass glass door kit.
H068 Hearth extension. Protects floor against sparks and radiant heat (residential installation). 0” x 68”
SB38
SB44
WSB48
WSB54
Glass Doors
AK4 Combustion Air
Assembly
RLTCF11
SLTCF11
Chimney Cap RLTCF11L
Extended Chimney
Cap
H068 Hearth
Extension Kit 11CF30-
Elbow
11CS
Chimney Support
11CF4 11CF3 11CF18 11CF1
Chimney Sections
8-6-1 or 8-1-1
Flashing
FSA or FS6A
Firestop Flat Washer
36” or 7” (13Z\x” Dia. Hole)
SB38HB
SB44HB
SB38 / SB44 Series Woodburning Fireplace
18 87D0057
Unpack and check the fireplace and chimney for damage. If any items have been damaged,
report this to your dealer. Before beginning the installation, be sure you have the proper parts
in sufficient quantity. Refer to Page 37 for proper identification of parts.
Do not substitute parts. Use only parts listed for use with the Models SB38 Series or SB44
Series fireplaces.
1. Refer to Figures 3 & 4 for an example of a typical installation of the fireplace components.
. Be sure the location of the fireplace will provide the required clearances indicated by Figures
1 through 6 and the minimum chimney air space clearance to combustibles of two inches.
3. Set the fireplace in the desired location and be sure it is securely supported and leveled.
Check the face of the fireplace with a carpenter’s level and if it is not plumb; correct it by
placing shims under the edges of the fireplace.
4. Block in the fireplace to prevent any shifting of the firebox. Secure the fireplace with nails or
screws through the flanges located on each side of the fireplace. Do not enclose the fireplace
until the combustion air duct and chimney pipes are installed.
Some local codes may require electrically grounding the fireplace and chimney.
In order to assure safe and satisfactory performance of the fireplace, it is very important to
properly install the chimney. This is an important part of the installation and the sections of this
manual pertaining to chimney installation should be reviewed very thoroughly.
For your safety, some of the important things to remember in regard to chimneys are listed
below:
1. Use only parts and accessories labeled for use with this fireplace.
. Use only undamaged parts and accessories.
3. Enclose the chimney where it passes through the living spaces to prevent contact with and
possible damage to the chimney.
4. Install firestop spacers at each ceiling level.
5. Install the proper chimney cap or chimney housing on the chimney to prevent the entry of
rain and debris into the chimney and to assure the proper venting of smoke.
6. Do not use more than four elbows in the chimney.
To select the proper chimney height, refer to Figure 3 or 4. The flue outlet must be a
minimum of three feet above the highest point where the chimney penetrates the roof and a
minimum of two feet above all portions of the building within ten feet. If the chimney is to include
elbows to offset the chimney, refer to the Chimney Offset and Cap Installation section of this
manual. There must be at least two inches air space between all sections of the chimney and
combustible materials between floors.
SB38 / SB44 Series Woodburning Fireplace
87D0057 19
1. Lay out, cut and frame openings through all ceilings and the roof at the point where the chimney
will pass through. Unless the chimney is to be offset, the point where the center line of the chimney
will pass through the ceiling and roof can be determined with a plumb line as shown by Figure
21. The fireplace should be located in the planned installation position. After the center line is
established and a nail is driven to mark the point, the opening can be cut if you are satisfied with
the chimney location relative to ceiling and roof joists and/or any other obstructions. The roof
opening center line should be marked by driving a nail through the roof from underneath that will
penetrate the roof and can be located from the rooftop. If the chimney is to penetrate a pitched
roof, the hole in the roof must be rectangular instead of square and should be sized according
to Table1.
. Install the firestop spacer as required from beneath the ceiling unless the space above is attic
space. In an attic, the firestop spacer should be installed at the floor level of the attic. You must
have joists or headers on all four sides of the spacer and use a minimum of four 8-penny nails
to secure the spacer.
3. To install the chimney sections, insert the male end of the flue, the smallest diameter pipe, into
the flue outlet of the fireplace and press down until the snap locks engage. Continue the process,
adding the chimney sections on top of each other until the chimney is at least six inches above
the roof opening on all sided. As the chimney sections are installed, check each joint to make
sure it is properly locked to the previous section. If additional strength of the outer pipe joints is
desired, you may use two or three sheet metal screws placed through the area where the outer
pipes overlap one another. To install these screws, drill a 1/8-inch diameter hole through the
chimney sections, taking care not to penetrate the inner flue pipe. : Be very careful
when drilling the holes into the outer pipe. The drill must not penetrate the inner stainless steel
pipe.
If you intend to have a total fireplace installation of more that 30 feet you must use chimney
support model 11CS at or below 30 feet to support the weight of additional chimney pipe.
To install the chimney support, place the crimped end of the flue and outlet air duct portions into the
last section of chimney pipe. Push down until the outside or inlet air duct of the chimney support
overlaps and snap locks the chimney support into the chimney section.
Nail the support straps tightly to a building frame member or ceiling joist as shown by Figure 20.
You must use at least two 8-penny nails per strap.
Figure 20
2' Min.
2' Min.
3'
Min.
10'
3'
Min.
10'
AC617
Flue outlet should be two feet above all portions of the building
within ten feet as shown in Figure 20. The chimney must not extend
more than 90 inches above the roof without additional support.
SB38 / SB44 Series Woodburning Fireplace
0 87D0057
Centerline of
Chimney
Figure 21
Actual Center Point
Plumb Line
Plumb Bob
Imaginary Center
Point
FP1891
Figure 22
Outer Pipe
Flue
Support Straps
Fasten Securely
Firestop
Chimney Support
Snap Lock Chimney
Support Securely to
Lower pipes Before
Fastening Support
Straps
FP1890
Angle of Chimney at Ceiling
Size of Chimney Vertical 30˚
11" CF 2-Wall FS2A
1756O" x 1756O"
(445 x 445 mm)
FS6A
17(6" x 296"
(454 x 753 mm)
CHIMNEY HOLE SIZE
Figure 23
Inlet Air Pipe
Ceiling Joist Flue Pipe
Firestop Spacer
Chimney Section
Header
Floor
Joist
Inlet Air Pipe
Flue Pipe
Firestop Spacer
Chimney Section
Header
FP189
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