MHSC SB50HB Owner's manual
87D0058 8/12 Rev. 6
3"COVER
287D0058
SB50HB Series Woodburning Fireplace
You have chosen the nest wood burning replace available. Your replace has been designed for years of heating and
viewing enjoyment. Please take time to read this entire manual before installing or operating your replace.
The instructions contained in this manual provide the information necessary to install this replace in accordance
with Underwriter’s Laboratories requirements and in compliance with the National Fire Protection Association
Standard No. 211. Some codes may require the replace and chimney be electrically grounded. Before beginning
the installation, you should check with local building ofcials 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 OMNI-Test Laboratories Inc. to U.L. 127-standard for factory-built replaces.
The design of this replace and these instructions complied with applicable safety standard for a factory built
replace in effect at the time the replace was manufactured. You should be aware, however, that failure to install,
operate, and maintain this or any other factory built replace properly can result in a house re 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 replace have appropriate skills in using the tools and techniques required;
and reading and comprehension skills sufcient 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 replace, please read the following special notices and all the contents of this manual.
Listing and Code Approvals ......................................................................................................................... 2
Safety Information ........................................................................................................................................ 3
Important Information ................................................................................................................................... 4
Operation Guidelines ................................................................................................................................... 5
Fireplace Dimensions .................................................................................................................................. 6
Clearances ................................................................................................................................................... 7
Fireplace Location........................................................................................................................................ 8
Installation Preparation ................................................................................................................................ 9
Floor Protection ...........................................................................................................................................11
Mantel Clearance ........................................................................................................................................13
Fireplace Components ................................................................................................................................15
Fireplace Installation ...................................................................................................................................16
Chimney Installation ....................................................................................................................................17
Chimney Offset Installation .........................................................................................................................19
Chimney Cap Installation ............................................................................................................................21
Chimney Cap Chase Installation ................................................................................................................ 23
Outside Combustion Air Precautions, Recommendations & Assembly ......................................................24
Gas Appliance Installation ......................................................................................................................... 26
Trim Installation .......................................................................................................................................... 27
Door Installation ......................................................................................................................................... 28
Fireplace Operation ................................................................................................................................... 29
Maintenance and Safety .............................................................................................................................31
Replacement Parts .................................................................................................................................... 34
Warranty .................................................................................................................................................... 35
87D0058 3
SB50HB Series Woodburning Fireplace
Read all instructions and warnings carefully before starting installation. Failure to fol-
low these instructions may result in a possible re hazard and will void the warranty.
MHSC replaces 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 replace or component parts,
immediately report damage to your MHSC dealer.
Only use MHSC components or the warranty will be voided
and a re hazard may be created.
MHSC warranty will be voided by and MHSC disclaims
any responsibility for the following actions:
•
•
•
•
•
Fuels used in gas, wood-
burning or oil red 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. 25249.6
Consult local building codes to ensure that you are in
compliance installing the replace.
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 replace should not be located in areas that create
drafts (ie: frequently opened doors and central heating
air inlets/outlets) that hamper the normal ow of air into
the re.
If you plan to install a gas log, the gas line should be in-
stalled before framing the replace. The gas line must be
installed by a certied gas line installer.
487D0058
SB50HB Series Woodburning Fireplace
1. Read these instructions entirely before beginning any
part of the installation. Save these instructions for any
future repairs.
2. Use these instructions as a guide during the installation
of the replace.
3. Be sure these instructions become the property of
and are reviewed by all future users of this replace 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 replace and accessories should not be altered
in any way that is not specically recommended in this
manual.
6. Refer to your local building code for local requirements
pertaining to installation of factory-built fireplaces.
Fireplaces are intended for installation and use
according to standard NFPA No.211 of the National Fire
Protection Association.
7. This replace must not be installed with a masonry
ue.
8. This replace and chimney should not be used for
venting a wood or coal burning heater or replace
insert.
The fireplace is designed to sit directly on a
combustible oor. The replace must be installed with
clearances to combustible building materials specied
in this manual. Only parts manufactured by MHSC
and labeled for use with the replace should be used
in the installation of this replace except for special
roof ashings that may be fabricated locally. The use
of improper parts in the installation can be hazardous
and voids the warranty offered by MHSC.
This replace is designed to burn wood. This replace
is not designed to burn coal, unplumbed liquid fuels,
unplumbed gaseous fuels or household refuse. Any
attempt to burn these fuels in the replace can be
hazardous.
Failure to heed usage warnings may cause a re
hazard and will void the Warranty. This replace is
intended for supplemental heating only and is not
intended for use as a primary heating system. For
use with Solid Wood Fuel, UL Classied Processed
Solid Fuel Fire Logs, or Certied Decorative Gas
Appliance.
Improper installation or use of this replace will void
the warranty and can cause:
1. Damage to the replace from overheating.
2. Hazardous temperatures to develop on
combustible materials adjacent to the replace
or chimney.
3. The emission of smoke, sparks or hazardous
gases into the dwelling.
4. Leakage of rain water into the dwelling.
87D0058 5
SB50HB Series Woodburning Fireplace
When an AK4 combustion air assembly and a combustion
air duct are attached to the connecting point on the left or
right side of the replace, combustion air may enter the
rebox through a dampered opening behind the left or
right side brick. This feature is designed for your benet
to reduce the room air used for combustion and to prevent
excessive loss of heat from the room. When the replace
is in use, this damper should be open. When the replace
is not in use, the damper should be closed to prevent cold
air from entering the rebox. The combustion air damper
is open when the lever, located on the left and right side
of the rebox near the top of the rebrick, 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 replace
allows the routing of the combustion air duct up, down,
or horizontally to obtain the outside combustion air. This
permits exibility in planning your installation. Refer to Page
19 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
benet from your replace. For large res, the maximum
heating benet from the replace will be obtained with the
doors open due to the high amount of radiant heat being
emitted out of the front opening of the replace. With a
small re, or before retiring in the evenings, it is best to
operate the replace with the doors closed to prevent
excessive room air form 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 rebox.
The replace also is equipped with a ue damper, which
must be open when the fireplace is in use. The flue
damper control lever is located inside the replace. The
counterweighted damper is operated by simply pushing
up to open or pulling down to close the damper. When
the replace 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 replace the rst
few times you use your new replace. 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 replace helps to appropriately
locate and contain the burning wood. Failure to use this
grate may cause overheating of parts of the replace and
allow large pieces of burning wood to roll forward out of the
rebox. If the grate becomes warped or damaged, it must
be replaced with grate number 072954 only.
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 ame may be
drawn out of the replace opening, creating risks of both
re and smoke.
All replace chimneys are in direct contact with cold air
on the exterior of the structure. Consequently, when the
replace is not in use, cold air can fall down the chimney of
the replace to cool off the replace chase. Therefore, the
replace chase must be insulated to minimize the risk of
cold air inltration to the home. Even if the replace chase
is adequately insulated, this cannot completely ensure that
cold air inltration into the structure will be eliminated. Cold
air inltration is a possibility with any replace or device
that freely communicates with the air on the outside of
the structure. Today’s homes are more energy-efcient
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 replace ue
or other locations of air leakage in the home. Because
cold air inltration may be unavoidable in some structures,
MHSC is not responsible for heat loss or air inltration
through or around the replace.
687D0058
SB50HB Series Woodburning Fireplace
Figure 1
3856O”
11”
1756O”
2856O”
59”
6656O”
456O”50”
59”
11”
30”
8”
38”
58”
456O”
956O”8”
1356M”
18”
539027
SB6000 dims
11” I.D. Flue
13C\,” O.D. Flue
A
B
C
FP1531
hearth dimensions
9/04 djt
SB50HB 48” 32” 22”
(1219 mm) (819 mm) (559 mm)
Figure 2
FP1531
87D0058 7
SB50HB Series Woodburning Fireplace
5956O”
5856O”
FP2217
SB6000 res install
Chimney Cap
Roof Flashing
Chimney Section
Maintain 2” Min. Air
space between Chimney
and Combustibles
Flexible Duct
Type FP-4-U
Combustion Air
Assembly
FP2217
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
18’ = Min. Height (No offsets)
24’ = Min. Height (2 30° Elbows)
30’ = Min. Height (4 30° Elbows)
86’ = Max. Height (Chimney Support
every 25’)
If Model WSB60B or GD60B glass doors are to
be used, noncombustible trim attached to the face of the
replace must not extend over the screen cover at the
top of the rebox opening. The screen cover will have
to be removed before the glass doors can be installed.
Noncombustible trim must not extend over each side of
the replace into the rebox opening to avoid interference
with installation of the Model WSB60B or GD60B glass
doors.
Floor
Figure 3
887D0058
SB50HB Series Woodburning Fireplace
This replace 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 replace is to be trimmed with a heavy stone
or brick facing and hearth extension, be sure the supporting
structure is adequate.
6956M” Min.
5956O”1956M”
MIn.
98” Min.
1956M”
Min.
24"
Min.
156O”
Air Space
Clearance
30”
Min.
FP2219
SB6000 framing
Figure 4
Screened Opening
FP2219
&0
FIREPLACELOCATION
Figure 5
Full Protection
Corner
Flush
FP2220
Figures 4 and 5 provide dimensional details of the replace,
required spacing to combustible walls, and some suggested
replace 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 airow around the replace. Air turbulence
near the replace may cause smoke to spill out of the
replace opening.
87D0058 9
SB50HB Series Woodburning Fireplace
Survey the planned location for the replace 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 as shown by Figure
8. All these conditions can cause turbulence or pressure
conditions that can cause poor chimney draft and smoke
spillage from the replace 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.
Figure 6
8’ 0”
Level
FP1880
install prep
8/08
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.
2. Local codes may not require restop-
ping at the ceiling level for chase in-
stallation, but it is recommended for
safety and reducing heat loss.
3. Do not insulate the chase with blown
or ll type insulation. Insulation
should only contact the replace at
points where the replace would nor-
mally be contacted by framing mate-
rials.
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 replace is to be installed on an outside
wall, the surrounding walls (chase) should be constructed
and insulated as shown by Figure 5. Failure to insulate the
replace from outside temperatures will cause heat loss
through and around the replace.
10 87D0058
SB50HB Series Woodburning Fireplace
3 ft. Min.
FP1883
multistory install
8/08
&0
CHIMNEYLOCATION
Figure 8
Preferred Location
Poor
Location
FP1882
18’ Min.
FP1881
single story install
8/08
Chimney Cap
Storm Collar
Flashing
Flue Outlet Height
3’ Min. or 2’ Above
any Point within 10’
See Table
1 for Roof
Opening Size
Attic Space
Firestop Spacer
(2” Air space
Clearance to
Combustibles)
Chimney
Sections
17”
Square
Opening
in Joist
FP1881
Figure 7
2” Minimum Clear-
ance to Combus-
tibles
Chimney Cap
Storm Collar
(Included with cap)
Flashing
See Table 1 for
Roof Opening
Size
Attic Space
Firestop
Spacer (2”
Air Space
Clearance to
Combustibles)
2” 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
Figure 9
that you insulate the replace enclosure to
eliminate cold air penetration as much as possible.
Insulate base of replace with a noncombustible insulation
rated for a minimum of 300° F. Insulating is very important for
outside wall installations over a concrete slab. If replace is
installed on a platform, insulation should be placed on top of
the platform before replace is set. Figure 6
When a replace 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
restop at the rst ceiling level above the replace and enclose
the chase with sheeting material. Insulation may then be in-
stalled above sheeting material to assure the space around
the replace is totally protected. Figure 6
Figures 7 & 9
87D0058 11
SB50HB Series Woodburning Fireplace
If this replace is installed on a combustible oor, the oor
area 20 inches in front of, and 12 inches either side of the
replace opening must be protected by an insulating non-
combustible hearth extension. This hearth extension may
be either minimum 6-inch thick stone or brick as shown by
Figure 10, or a locally constructed hearth equivalent.
A 20” x 74” piece of galvanized steel should be installed
to cover the insulation before a nishing layer of noncom-
bustible material of stone, brick, tile, etc., is applied to nish
the hearth extension.
12”
Min.
12”
Min.
FP2221
decorative hearth
20”
Min.
8”
Min.
Figure 10
Hearth
Safety Strip is Re-
quired When Unit is
Placed on a Combus-
tible Floor or Platform
Brick or Stone Hearth
Extension - 74” Long
Min.
FP2221
12”
74”
12”
20”
FP2222
hearth extension
Figure 12
Minimum Hearth Extension Dimensions
Screened Opening
FP2222
A hearth extension placed on a
combustible oor 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
specications and directions for proper
installation of the replace and hearth
extension.
FP2247
finishing front
12/20/01 djt
Do not
place nishing materials
beyond these edges or
cover air inlets
Screen
Rail
Hearth
FP1168
Figure 11
The insulation used in the hearth extension should have a
thermal conductivity (K factor) of 0.43. If you do construct
a hearth extension, be sure the insulation you use has
enough compressive strength to support the weight of the
covering materials and persons standing on it, and insulat-
ing qualities equal to or better than that described above.
12 87D0058
SB50HB Series Woodburning Fireplace
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 relationship 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 1/2 (.50)
C = .86)
K = C multiplies by the material thickness
(Example K = .86 multiplied by 1/2 (.50)
K = .43)
R= The material thickness divided by K
(Example R = 1/2 (.50) divided by .43
R = 1.16)
With either type hearth extension minor shifting of the sup-
porting oor or expansion and contraction may eventually
cause a crack to develop between the hearth extension and
the face of the replace. To help prevent the crack from
developing, the hearth extension materials must be rmly
fastened in place. Wall ties should be screwed to the face
of the replace and imbedded in the mortar joints of brick,
stone, or other non-combustible materials. The metal safety
59”
30”
58”
2856O”
20”
74”
FP2223
hearth protection
Figure 13
Metal Safety Strip
Combustible
Floor
FP2223
Hearth
Protection
The hearth extension and the
metal safety strip should be installed only
in a horizontal relationship to the replace.
12”
Min. 12”
Min.
20” Min.
FP2224
hearth ext front
Top of Raised Hearth Floor Line with
Raised Hearth
Hearth
Extensions
Metal Safety
Strip
Figure 14
FP2224
strip packed with the replace must be placed beneath
the replace and extended under the hearth extension
or into a mortar joint of the hearth extension as shown by
Figures 10, 13, and 14. In the event a crack does eventu-
ally develop, the metal safety strip will serve as a barrier
to prevent sparks or embers from falling from the replace
onto combustible ooring materials.
87D0058 13
SB50HB Series Woodburning Fireplace
MA81
rev. 8/5/97
rev. 4/18/01
156O"
Ref.
*
* *
MA81
Figure 15 -
Combustible Mantel Clearances
Face Plate
Finish the wall with material of your choice.
Figure 15. If a combustible material is
used below a at mantel shelf, consult your local building
codes for minimum clearance from top of replace opening
to bottom of mantel shelf.
All joints (top, bottom and sides) where wall or decorative
facing material meets replace surround must be com-
pletely sealed with a noncombustible material. Figure 16
14 87D0058
SB50HB Series Woodburning Fireplace
FP531
surround flush with
finish wall
12/20/01 djt
12"
(305 mm)
Max.
18"
(457 mm)
min.
6”
(152 mm)
156O"
12"
(305 mm)
Max.
18"
(457 mm)
min.
156O"
6"
(152 mm)
Min.
3/4"
FP2683
Figure 16 -
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
Noncombustible
Material
Combustible
Mantel and Trim
Finished Wall
Header
Ledge Bracket
Noncombustible
Material
Surround
Face
Noncombustible Facing
Material
Fireplace Opening
2 x 4 Stud
Finished Wall
Must be sealed with
noncombustible
material
87D0058 15
SB50HB Series Woodburning Fireplace
FP2225
SB6000 fireplace components
SB50HB
WSB60B,
GD60B
Glass Doors AK4 Combustion Air
Assembly
SLTCF11
Chimney Cap RLTCF11L
Extended Chimney
Cap
H2074 Hearth
Extension Kit 11CF30-2
Elbow
11CS
Chimney Support
11CF4 11CF3 11CF18 11CF1
Chimney Sections
8-6-12 or 8-12-12
Flashing
FS2A or FS6A
Firestop Flat Washer
36” or 72” (13Z\x” Dia. Hole)
SB50HB 50” front opening replace. Includes rescreen, sealing ue damper and outside combustion air capa-
bility. When installed, outside combustion air can be connected to either left or right side. Refer to
installation instructions for details.
11CF1 12” chimney section
11CF18 18” chimney section
11CF3 36” chimney section
11CF4 48” chimney section
11CF30-2 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.
8-6-12 0-6/12 pitch ashing for contemporary installation.
8-12-12 6/12 to 12/12 pitch ashing for contemporary installation.
FS2A Vertical Firestop spacer - One required at each ceiling or oor level.
FS6A 30° Firestop spacer - for 30° chimney incline through ceiling or oor.
FP-4-U 4” insulated combustion air duct, 8’ length.
403 4” duct connector (for splicing FP-4 ducts). Includes 2 clamps.
AK4 4” outside combustion air assembly.
WSB60B, GD60B Optional polished brass glass door kit.
S20BR/BT/BW/S20UB Top Housing with Upper Bafe
FS2100-HT Attic Insulation Shield (not shown)
S20BR/BT/BW
Top Housing
S20UB Upper
Bafe
16 87D0058
SB50HB Series Woodburning Fireplace
Unpack and check the replace and chimney for dam-
age. If any items have been damaged, report this to your
dealer. Before beginning the installation, be sure you have
the proper parts in sufcient quantity. Refer to Page 35 for
proper identication of parts.
Do not substitute parts. Use only parts listed for use with
the Model SB50HB replace.
1. Refer to Figure 1 for an example of a typical installation
of the replace components.
2. Be sure the location of the replace will provide the re-
quired clearances indicated by Figures 1, 3 & 4 and the
minimum chimney air space clearance to combustibles
of two inches.
3. Set the replace in the desired location and be sure
it is securely supported and leveled. Check the face
of the replace with a carpenter’s level and if it is not
plumb; correct it by placing shims under the edges of
the replace.
4. Block in the replace to prevent any shifting of the re-
box. Secure the replace with nails or screws through
the anges located on each side of the replace. Do not
enclose the replace until the combustion air duct and
chimney pipes are installed.
Some local codes may require electrically ground-
ing the replace and chimney.
In order to assure safe and satisfactory performance of the
replace, 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
replace.
2. 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 restop 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. The ue 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 build-
ing 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 oors.
87D0058 17
SB50HB Series Woodburning Fireplace
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 18. The replace 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 satised 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.
2. Install the restop spacer as required from beneath the
ceiling unless the space above is attic space. In an attic,
the restop spacer should be installed at the oor 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.
Figure 17
2' Min.
2' Min.
3'
Min.
10'
3'
Min.
10'
AC617
RLTSKC8
2/11/98
AC617
Flue outlet should be two feet above all portions of the building
within ten feet as shown in Figure 17. The chimney must not extend
more than 90 inches above the roof without additional support.
3. To install the chimney sections, insert the male end of
the ue, the smallest diameter pipe, into the ue outlet
of the replace 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 sides. 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 diam-
eter hole through the chimney sections, taking care not
to penetrate the inner ue 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 replace 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 ue 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 19. You must use at
least two 8-penny nails per strap.
18 87D0058
SB50HB Series Woodburning Fireplace
&P
CENTERPOINT
Centerline of
Chimney
Figure 18
Actual Center Point
Plumb Line
Plumb Bob
Imaginary Center
Point
FP1891
&0
CHIMNEYINSTALL
Figure 19
Outer Pipe
Flue
Support Straps
Fasten Securely
Firestop
Chimney Support
Snap Lock Chimney
Support Securely to
Lower pipes Before
Fastening Support
Straps
FP1890
FP 548b
SHR
5/11/99 djt
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
&0
FIRESTOPINSTALL
Figure 20
Inlet Air Pipe
Ceiling Joist Flue Pipe
Firestop Spacer
Chimney Section
Header
Floor
Joist
Inlet Air Pipe
Flue Pipe
Firestop Spacer
Chimney Section
Header
FP1892
87D0058 19
SB50HB Series Woodburning Fireplace
The following are important points that should be observed
when installing elbows on the replace:
1. The support straps of all elbows not installed directly
on top of the replace should be nailed securely to the
surrounding structure. This allows the support strap to
carry the weight of the chimney above the elbow and
prevents this weight from breaking the elbow or chimney
sections apart.
2. Elbows should not be used in any combination that
inclines the chimney more than 30 degrees from
vertical.
3. The limitations on the quantity of elbows per chimney
are as follows: If the total height of the replace and
chimney is — 24 feet or more — two elbows may be
used in the chimney. 30 feet or more — four elbows
may be used in the chimney.
4. The inclined portions of chimneys that pass through
living spaces likely to be used for storage should be
enclosed to avoid contact with and possible damage
to the chimney. The minimum air space of two inches
between the chimney and enclosing materials must be
maintained.
5. The length of the inclined portion of chimney between
elbows must not exceed 6 feet when unsupported or
20 feet if the chimney is supported at six-foot intervals
with support such as metal support straps.
6. When enclosing the elbows and inclined portions of the
chimney, enclosing materials must be installed vertically
to maintain the required two-inch minimum air space
clearance to the chimney at the extremities of the offset.
It is recommended that enclosing material not follow the
inclined portions of the chimney.
&0
ELBOW
Figure 21
Inlet Air
Pipe
Flue
All four (4) support straps
must be nailed on to fram-
ing member around the
elbow with a minimum of
two (2) 8-Penny nails per
strap
Although both halves of the
elbow set may have tie straps, only
the top half must be secured. The
bottom elbow half is not required to
be secured for added stabilization of
pipe.
FP1893
1. Determine the location and amount of offset required,
then select the combinations of chimney sections and
elbows required from the offset chart. Refer to Page
20.
2. Install the rst 11CF30 elbow by placing the extended
ue into the mating part of the replace or chimney
section. Push down until the outside or inlet air duct of
the elbow overlaps and the snaps lock the elbow into
the replace or chimney section.
3. Nail the support straps to the framing member with a
minimum of two 8-penny nails per strap.
4. Install the sections of pipe between elbows until
the proper number of chimney sections have been
installed.
5. Install the second elbow to return the run of the chimney
to vertical.
6. Nail the support straps of the second elbow to a building
frame member.
7. Continue installing the vertical portion of the chimney.
If the inclined portion of the chimney passes
through a oor or ceiling, an FS6A restop spacer should
be installed to provide the restop and support required.
Be sure proper spacing in maintained between the chimney
and combustibles.
20 87D0058
SB50HB Series Woodburning Fireplace
0 0 0 0 0 3" 11"
1 0 0 0 0 8Z\₄" 20"
0 1 0 0 0 11Z\₄" 25Z\₄"
2 0 0 0 0 13Z\x" 29Z\₄"
1 1 0 0 0 16Z\x" 34Z\₄"
0 0 1 0 0 20Z\₄" 40C\₄"
2 1 0 0 0 21C\₄" 43Z\x"
0 0 0 1 0 26Z\₄" 51Z\₄"
0 1 1 0 0 28Z\x" 55Z\₄"
1 0 0 1 0 31Z\x" 60Z\₄”
0 1 0 1 0 34Z\x" 65Z\x"
0 0 2 0 0 37Z\x" 70C\₄"
1 1 0 1 1 41Z\x" 77C\₄"
0 0 1 1 1 45" 83C\₄"
0 1 2 0 1 47Z\₄" 87Z\x"
0 0 0 2 1 51" 94"
0 1 1 1 1 53Z\₄" 98"
0 0 3 0 1 56Z\₄" 103Z\₄"
0 1 0 2 1 59Z\₄" 108Z\x"
0 0 2 1 1 62Z\₄" 113Z\x"
0 1 3 0 1 64Z\x" 117Z\x"
0 0 1 2 1 68Z\₄" 124"
0 1 2 1 1 70Z\x" 128"
0 0 0 3 1 74Z\₄" 134Z\x"
0 1 1 2 2 78" 140C\₄"
0 0 3 1 2 81" 146"
0 1 0 3 2 84" 151Z\₄"
0 0 2 2 2 87" 156Z\x"
0 1 3 1 2 89Z\₄" 160Z\₄"
0 0 1 3 2 93" 166C\₄"
0 1 2 2 2 95Z\₄" 170C\₄"
0 0 0 4 2 99Z\₄" 177C\₄"
0 1 1 3 2 101Z\₄" 181C\₄"
0 0 3 2 2 104Z\₄" 186Z\₄"
0 1 0 4 2 107Z\₄" 191Z\x"
0 0 2 3 2 110Z\₄" 196C\₄"
0 1 3 2 3 114" 203Z\₄"
0 0 1 4 3 117C\₄" 209C\₄"
0 1 2 3 3 120" 213Z\x"
0 0 0 5 3 123C\₄" 220"
¹⁄₂
G + H cannot exceed 20 feet.
*11CF Chimney airspace clearance = 2" minimum.
The following safety rules apply to offset
installations (letters correspond with illustra-
tion above):
Height of the chimney is measured from
the hearth to the chimney exit.
SB50HB
Max.: 86'
Min.:
0 Elbows 18’0"
2 Elbows* 24’0"
4 Elbows* 30’0"
Do not use more than 4 elbows per chim-
ney.
Attach the straps of the return (top) elbow to a
structural framing member.
The offset (rst) elbow of any pair does not
have straps.
FP269
The chimney cannot be more than
30° from the vertical plane in any instal-
lation.
The maximum length of the angled
run of the chimney system is 20
feet. (G plus H cannot exceed 20 feet.)
A chimney support (Model 11CS)
is required every 6 feet of angled run
of chimney. Chimney supports are
required for every 30 feet and 60 feet
chimney height above the hearth.
Determine the offset distance of your
chimney arrangement from the center-
line of the replace to the centerline of
the chimney where it is to pass through
the rst ceiling.
This offset distance may not be
your full offset distance. See Examples
2 and 3.
IWF282
MBUF
5/26/96
OFFSET
RISE
FP282
D
BG
H
B
C
E
6 FT.
G
H
A
IWF269
MBUF
5/16/96
rev. 5/25
30°
Return
Elbow
Chimney Flue Exit
Chimney
Section
30°
Offset
Elbow
11CS Sup-
port
30°
Offset
Elbow
30°
Return
Elbow
Elbow
Hearth Floor
Figure 22
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