Martin Fireplaces | 400BWBCIA | SB4800/SB4800HB Models Woodburning Fireplaces

SB4800/SB4800HB Models
Woodburning Fireplaces
Installation, Operation and Maintenance Manual
For Residential Installation
ONLY unvented gas log sets which have been found to comply with the Standard for Unvented
Room Heaters, ANSI/IAS/AGA Z21.11.2, are to be installed in this fireplace.
When an approved ANSI/ISA/AGA Z21.11.2 unvented room heater is installed in this fireplace, an
H2853 canopy must also be installed.
WARNING: DO NOT operate an unvented gas log set in this fireplace with the chimney removed.
This fireplace is U.L. listed for use with the
“L” Series Chimney System components.
Underwriter’s Laboratories, Inc.®
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53D9025
CONTENTS
Congratulations!
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.
Table of Contents
Listing and Code Approvals .......................................................................................................................... 1
Important Information ................................................................................................................................... 2
Operation Guidelines .................................................................................................................................... 3
Clearances ................................................................................................................................................4-6
Fireplace Location ........................................................................................................................................ 7
Installation Preparation ..............................................................................................................................8-9
Floor Protection ..................................................................................................................................... 10-11
Fireplace Components ............................................................................................................................... 12
Fireplace Installation .................................................................................................................................. 13
Chimney Installation ..............................................................................................................................14-15
Chimney Offset Installation....................................................................................................................16-17
Chimney Cap Installation ......................................................................................................................18-19
Chimney Cap Chase Installation ................................................................................................................ 20
Outside Combustion Air Precautions and Recommendations ...............................................................21-22
Combustion Air Assembly ........................................................................................................................... 23
Gas Appliance Installation .....................................................................................................................24-25
Trim and Door Installation .......................................................................................................................... 26
Fireplace Operation ...............................................................................................................................27-28
Maintenance and Safety ........................................................................................................................29-31
Repair Parts Diagram and List ..............................................................................................................32-33
Warranty ................................................................................................................................................34-35
Listing And Code Approvals
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.
211. 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. 127-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.
2
53D9025
IMPORTANT SAFETY INFORMATION
Installer
Please leave these instructions with the owner.
Owner
Please retain these instructions for future reference.
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 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.211 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.
WARNING: Do not install a separate solid fuel insert or gas fireplace insert into this fireplace and chimney system
without written authorization.
9. WARNING: Do not pack required air spaces with combustible material or insulation not specifically recommended
for use in such areas.
Intended Product Usage
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.
“Do not use a fireplace insert or other product not specified for use with this fireplace.”
Improper Installation
Improper installation or use of this fireplace will void the warranty and can cause:
1.
2.
3.
4.
Damage to the fireplace from overheating.
Hazardous temperatures to develop on combustible materials adjacent to the fireplace or chimney.
The emission of smoke, sparks or hazardous gases into the dwelling.
Leakage of rain water into the dwelling.
53D9025
3
OPERATION GUIDELINES
When a 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 Figure 25 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 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 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.
NOTE: 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 052874 only.
WARNING: 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.
4
53D9025
PRODUCT FEATURES
Figure 1
Residential Installation
(Flue Outlet Height)
Model LC
Chimney Cap
15 ft. = Min. Height (No offsets)
15 ft. = Min. Height (2 30° Elbows)
21 ft. = Min. Height (4 30° Elbows)
86 ft. = Max. Height (Chimney support
every 25 ft.)
Roof Flashing
Model 612
Storm
Collar
Firestop Model LF-FS-2
(Requires 17 x 17 framing)
L12 (1 ft. pipe)
L18 (1¹⁄₂ ft. pipe)
L36 (3 ft. pipe)
L48 (4 ft. pipe)
Maintain 2” Minimum Air Space Between Chimney and Combustibles
Top Spacer
48”
Fireplace Model
SB4800
52”
(Floor Line)
Flexible Duct
Type FP-4-U
CAUTION: Do Not Restrict Side Air Inlet Vents
with Surround or Trim Materials
Galvanized Metal Strip
Combustion Air
Assembly
Nail to Framing Members
FP1875
SB4800 features
8/08
53D9025
5
FIREPLACE DIMENSIONS
28”
Figure 2
11” Inside
Diameter Flue
13” Outside
Diameter
Outer Pipe
9���”
26���”
16���”
4����”
4����”
38”
9/16”
47���”
1/8”
6���”
11����”
52���”
Gas Line
Opening
27”
35���”
Outside Air
Opening
10����”
8����”
8���”
11���”
Front
15�����”
Right Side
L36
70 Linear Gain
70���
SCALE:
1/2" = 1'0"
L12
11
11���
L36
L18
17
17���
L36
70 Linear Gain
70���
SCALE:
1/4" = 1'0"
53D9025
SB4800 dims
8/08
L36
L18
52 Linear Gain
52���
L18
L18
34 Linear Gain
34���
L36
L48
35
35���
L36
L36
L18
52 Linear Gain
52���
L48
L36
47
47���
47
47���
35
35���
L18
17
17���
L18
L18
34 Linear Gain
34���
L12
11
11���
L36
20'5" Linear Gain
20.5���
6
53D9025
������
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L3
56���”
6
L3
6
46���”
61����”
76�����”
L3
6
L1
8
L4
8
L3
6
CHIMNEY SECTION DIMENSIONS
21�����”
30�����”
39�����”
25����”
L1
8
16����”
L1
2
LE
Elb 30
ow
27�����”
30���”
SCALE:
1/2" = 1'0"
4����”
61����”
76�����”
L3
6
L1
8
56���”
L3
6
L3
6
46���”
L4
8
SCALE:
1/4" = 1'0"
L3
6
9�����”
12�����”
NOTE: Dimensions May Vary Slightly De to Manufacturing Tolerances.
21�����”
30�����”
39�����”
25����”
L1
8
2
16����”
L1
LE
Elb 30
ow
27�����”
30���”
4����”
12�����”
9�����”
FP1877
elbows dims
8/08
53D9025
7
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.
CAUTION
FIREPLACE LOCATION
Do not install fireplace
over carpeting.
Figures 3 and 4 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.
Figure 3
60���” Minimum
19
M ���”
in
.
1���” Minimum Air Space Clearance
um
”
im
���
23���” Min.
28” Minimum
Screened
Opening
19
M ���”
in
.
85
���
”M
in
47
27���”
Minimum
Figure 4
*16”
70���” Minimum
*Applies when Glass Doors are installed
Corner Installation
Side Wall Installation
FP1879
opening dims
8/08
Full Projection
Corner
Flush
8
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53D9025
INSTALLATION PREPARATION
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 as shown by Figure 7. 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 5. Failure to insulate the fireplace
form outside temperatures will cause heat loss through and around the fireplace.
Figure 5
LCL Telescoping
Chimney Cap
Joint Insulate
Same as Ceiling
LCLF Flat Chase
Top Flashing
Chimney Sections “L” Series
Refer to
Notes
Firestop Spacer
Insulate Outside
Walls of Chase
8’ 0”
Level
Solid Continuous
Surface
Insulation
(Thermal Barriers)
NOTES:
1. Model LF-FS-2 Firestop Spacer must be used.
2. Local codes may not require fire stopping at
the ceiling level for chase installations, 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 normally be contacted by framing materials.
53D9025
Outside Base
FP1880
install prep
8/08
9
INSTALLATION PREPARATION
Figure 6
Single Story Installation with Attic Space
LC Chimney Cap
Flue Outlet Height
Storm Collar
3’ Min. or 2’ Above
Any Point Within 10’
Flashing
(612 or 1212)
Attic Space
See Table 1
for Roof Opening Size
18 ft. Min.
Firestop Spacer LF-FS-2 (2” Air
Space Clearance to Combustibles)
17”
Square
Opening
in Joist
“L” Series Chimney
Components
2” Min. Clearance to
Combustibles
Figure 8
Multiple Story Installation
Model LC
Chimney Cap
Flue Outlet Height
Storm Collar
(Included with cap)
Figure 7
Flashing
(612 or 1212)
FP1881
Preferred
single
storyLocation
install
8/08
Poor Location
17” Square
Opening in
Joist
3 ft. Min.
Attic Space
See Table 1 for
Roof Opening
Size
Firestop Spacer LF-FS-2
(2” Air Space
Third Floor
Clearance to
Combustibles) Area
2” Clearance to
Combustibles (Min.)
Max.
Installation
Height - 86
ft. Chimney
17” Square
Opening in
Joist
Firestop Spacer LF-FS-2
Second
(2” Air Space
Floor Area
Clearance to
Combustibles)
Firestop
Spacer
LF-FS-2 (2”
Air Space
First Floor
Clearance to Area
Combustibles)
17” Square
Opening in
Joist
10
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����
53D9025
FP1883
multistory install
FLOOR PROTECTION
If this fireplace is installed on a combustible floor, the floor area 20 inches in front of, and 12 inches either side of the
fireplace opening must be protected by an insulating noncombustible hearth extension. This hearth extension may
be either minimum 6-inch thick stone or brick as shown by Figure 9, an H2068 hearth extension kit or a locally constructed equivalent to the H2068.
The H2068 hearth extension kit consists of sufficient insulation board to cover the 20” x 68” floor area with ° inch layer
of insulation. A 20” x 68” 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 H2068 hearth extension has a thermal conductivity (K factor) of 0.43. If you do construct a
hearth extension equivalent to the H2068, 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 1/2”
covering provided by the H2068.
Figure 9
12”
Min.
Alternate brick or stone hearth
extension for use with the SB4800
fireplace when placed over a
combustible floor without insulation
board protection.
20” Min.
12”
Min.
6” Min. Brick or
Stone from Top
of Platform
SB4800 Fireplace
Hearth
Safety Strip is required when
unit is placed on combustible
floor or platform.
Brick or Stone Hearth
Extension
(62” Long Minimum)
NOTE: A hearth extension placed on a combustible floor must be constructed with rigid insulation which has minimum “R” value of 1.16 or a “K”
value of .86. The insulation must������
be covered with
a non-combustible covering such����������������
as tile stone,
marble or a piece of .018 minimum
sheet meal
����
which is needed to protect the insulation. Follow
instructions provided with the fireplace for all oth-er
specifications and directions for proper instal-lation
of the fireplace and hearth extension.
53D9025
Figure 10
Fireplace and Hearth Extension
- Top View
12”
12”
MHSC H2068 Hearth Extension or
Equivalent
20”
62”
FP1885
hearth extension
8/08
11
FLOOR PROTECTION
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)
Figure 11
53���”
K = C multiplies by the material thickness
(Example K = .86 multiplied by 1/2 (.50)
K = .43)
52���”
R= The material thickness divided by K
27”
(Example R = 1/2 (.50) divided by .43
R = 1.16)
Metal Safety Strip
Combustible
Floor
26���”
ctor
rote
hP
eart
H
20”
Figure 12
68”
WARNING: The hearth extension and
the metal safety strip should be installed only in a horizontal relationship
to the fireplace, as illustrated.
FP1886
hearth protction
8/08
12”
Min.
12”
Min.
Top of Raised
Hearth
Floor Line with
Raised Hearth
20” Min.
Metal Safety Strip
Hearth Extension
With either type hearth extension minor shifting FP1887
of the supporting floor or expansion and contraction may
hearth extension
eventually cause a crack to develop between the8/08
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 non-combustible 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 9 and 11. 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.
12
53D9025
FIREPLACE COMPONENTS
WSB48
Glass Doors
LCS
Chimney
Support
LE30
30° Elbow Set
SB4800
SB4800HB
AK4
Combustion
Air Assembly
H2068
Hearth
Extension Kit
LF-FS-2
Firestop Spacer
Model Number
SB4800
L48
L36
L18
L12
LE30
LCS
LC
LCL
612
1212
LF-FS-2
LF-FS-30
FP-4-U
403
LCLF
AK4
WSB48
H2068
53D9025
612-1212
Flashing
LCL
Telescoping
Chimney Cap
LC
Chimney Cap
L48 L36
L18 L12
Chimney Sections
LCLF Flat flashing
36"x72" (13.5" Diameter Hole)
Description
44 inch front opening fireplace. Includes wire firescreen, sealing flue damper and outside combustion air capability. When installed, outside combustion air can be connected to left side.
See installation instructions
������ for details. NOTE: HB models have herringbone brick pattern.
4-foot chimney section
(11-inch diameter flue/13” dia. outer pipe)
��������������������
3-foot chimney section
����(11-inch diameter flue/13” dia. outer pipe)
1¹⁄₂-foot chimney section (11-inch diameter flue/13” dia. outer pipe)
1-foot chimney section (11-inch diameter flue/13” dia. outer pipe)
One pair of 30-degree elbows. Maximum-two pairs (4 elbows per chimney)
Chimney support (required when chimney height exceeds 30 feet)
Round chimney cap for contemporary installation. Includes storm collar.
Round telescoping chimney cap. For use with flat chase top terminations.
0-6/12 pitch flashing for contemporary installation.
6/12-12/12 pitch flashing for contemporary installation.
17-inch firestop spacer. One required at each ceiling or floor level.
Firestop spacer-for 30 degree chimney incline through ceiling or floor.
4-inch insulated combustion air duct-8-foot lengths.
4-inch duct connector (for splicing FP-4 ducts). Includes two clamps.
3’ x 7’ Flat chase flashing. For use with LCL chimney cap.
4-inch outside combustion air assembly.
Optional polished brass glass door kit.
Hearth extension-protects floor against sparks and radian heat (residential installation) 20” x 68”.
13
FIREPLACE INSTALLATION
Location Selection
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 Figure 26 for proper identification of parts.Do not substitute parts.
Use only parts listed for use with the Model SB4800/SB4800HB fireplaces.
Fireplace Installation
1. Refer to Figure 1 for an example of a typical installation of the fireplace components.
2. Be sure the location of the fireplace will provide the required clearances indicated by Figures 2,
& 3 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.
NOTE: Some local codes may require electrically grounding the fireplace and chimney.
Chimney Installation
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.
2. Use only undamaged parts and accessories.
3. Enclose the chimney where it passes through the living spaces to prevent contact with and
possible dam-age 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.
NOTE: To select the proper chimney height, refer to Figure 1. 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.
14
53D9025
CHIMNEY INSTALLATION
10'
Figure 14
10'
24” MIN.
36”
24” MIN.
36”
NOTE: Flue outlet should be two feet above all portions of the
building within ten feet as shown in the illustration. The chimney
must not extend more than 90 inches above the roof without additional support.
FP1889
chimney all
location
1. Lay out, cut and frame openings through
ceilings and the roof at the point where the chimney
8/08
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
15. 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.
2. 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-penney nails to
secure the spacer.
3. To install the “L” series 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. WARNING: Be very careful when
drilling the holes into the outer pipe. The drill must not penetrate the inner stainless steel pipe.
NOTE: If you intend to have a total fireplace installation of more that 30 feet you must use chimney
support model LCS 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 16. You
must use at least two 8-penney nails per strap.
53D9025
15
CHIMNEY INSTALLATION
Figure 15
Centerline of
Chimney
Actual Center Point
Minimum Required Roof Opening
Minimum Framed Opening
“L” Series
Roof Pitch
Doublewall Chimney
0/12
17” x 17”
1/12
17” x 17” 1/8”
2/12
17” x 17” 1/4”
3/12
17” x 17” 1/2”
4/12
17” x 17” 3/4”
5/12
17” x 18” 1/4”
6/12
17” x 18” 3/4”
7/12
17” x 19” 3/8”
8/12
17” x 20”
9/12
17” x 20” 5/8”
10/12
17” x 21” 3/8”
11/12
17” x 22” 1/4”
12/12
17” x 23”
Plumb Line
Plumb Bob
Imaginary Center
Point
Firestop Spacer Installation at Attic Level
Inlet Air Pipe
Figure 17
Flue Pipe
Ceiling Joist
Figure 16
������
�����������
����
Outer Pipe
Flue
Firestop Spacer
Header
Chimney Section
Support Straps
Fasten Securely
Firestop
Firestop Spacer Installation at Floor Levels
Inlet Air Pipe
Chimney Support
Flue Pipe
Floor
Joist
Snap Lock Chimney
Support Securely to
Lower pipes Before
Fastening Support
Straps
Firestop Spacer
Header
Chimney Section
16
������
���������������
����
53D9025
������
CHIMNEY OFFSET INSTALLATION
Elbow Installation
The following are important points that should be observed when installing elbows on the fireplace:
1. The support straps of all elbows not installed directly on top of the fireplace 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.
Figure 18
All four (4) support straps
must be nailed on to framing member around the
elbow with a minimum of
two (2) 8-Penny nails per
strap
Inlet Air
Pipe
NOTE: 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.
Flue
3. The limitations on the quantity of elbows per chimney are as follows: If the total height of the
fireplace and chimney is—12’ - 2” or more —������
two elbows may be used in the chimney. 21’ - 0” 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.
Offset Installation Sequence
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 19.
2. Install the first LE30 elbow by placing the extended flue into the mating part of the fireplace or
chimney section. Push down until the outside or inlet air duct of the elbow overlaps and the snaps
lock the elbow into the fireplace 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.
NOTE: If the inclined portion of the chimney passes through a floor or ceiling, an LF-FS-30 firestop
spacer should be installed to provide the firestop and support required. Be sure proper spacing in
maintained between the chimney and combustibles.
53D9025
17
CHIMNEY OFFSET AND CAP INSTALLATION
Figure 19
Continue chimney to proper
height and install round chmney
cap or chimney housing
C
L
17”
22����”
Storm Collar
Flashing
Roof
Firestop Spacer as
Required
7���”
7����”
Centerline of
Chimney
30°
Fasten Suport Straps
Securely
2” Minimum Air
Space Clearance
to Combustibles
with use of LF-FS-2
Firestop
NOTE: Two (2)
elbows may be used
when total installatin
height exceeds 24’2”
FP1894
firestop spacer
Continue chimney through roof
8/08C
L
and install round chimney cap
or chimney housing
Firestop Spacer 2” Minimum Air Space
Clearance at Jois. (“L” Sries Chimney)
Chimney Must Be Enclosed in
Accessible Areas
Support Straps Not
to Penetrate Firestop
Vertical Chimney
Enclosure
������
Scribe Line
�������������������
at Bottom
����
Hold 13” Diameter
(Outside) Pipe Vertical
Vertical Chimney
Enclosure
Fasten All Support
Straps Securely
Firestop Spacer
Vertical Chimney Enclosure
Recommended.
Diagonal Chimney Enclosure
Acceptable
Diagonal Chimney
Enclosure
NOTE: LCL chimney cap is same as LC
with the exception of a longer telescoping pipe which may be needed for special
installations such as chase installations.
������
�����������
����
RISE
Diagonal Chimney
Enclosure
18���”
Model LC
Chimney
Cap
Support Straps
Offset Max 10’
C
L
Firestop Spacer 2”
Air Space Clearance
to Combustibles
*36”
Apply Mastic Here
Storm Collar
Flashing
NOTE: Four (4) elbows may be
used when toatl installation height
exceeds 24 ft.
* or 2” Above Any Point Within 10’
Maximum four (4) elbows Per
Fireplace
18
������
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����
FP1898
chimney cap install
8/08
53D9025
CHIMNEY CAP INSTALLATION
Model LC Chimney Cap
SPECIAL NOTE: The proper height as previously explained is important to assure proper draft and
safety. The chimney cap extends the flue outlet four inches above the top of the last section of chimney. This should be kept in mind when determining the proper height for the chimney. The chimney
should not be extended more than 90 inches above the supporting roof structure without additional
support. In the case of an “A” frame type construction or other steep pitch roofs that require more
than 90 inches of chimney above the roof, a support should be attached to the chimney at the 90 inch
level that is strong enough to support a wind load of 3-1/8 pounds for each inch the chimney extends
above 90 inches. The flue outlet must be a minimum of three feet above the point where in penetrates
the roof.
CAUTION: Be careful to avoid electrical shock hazard when contacting wires to the metal chimney
components.
1. Extend the regular chimney sections until the top of the chimney is 4 inches below the total flue
height desired. Do not snap the last section of inlet air duct or largest diameter pipe in place until
Step 3 is completed.
2. Remove the shingles from around the chimney so that the flashing may be installed, with the upper part of the flashing under the shingles.
3. Set the flashing on the roof. Hold a section of the outside pipe (13” diameter) on the flashing and
scribe a line around the flashing, then cut the top off the flashing by cutting 1/4 inch below the
scribed line. This should increase the diameter of the flashing outlet sufficiently to allow the flashing to be placed over the chimney. See Figure 19.
4. Snap the last section of inlet air duct in place and slide the flashing over the chimney. Adjust the
chimney to assure that the proper minimum clearances are maintained.
5. Nail the flashing securely in place with eight nails.
6. Seal the crack between the top of the flashing and the chimney with mastic. Leave some excess
mastic at this area to be used in step eight. NOTE: Use pliers and wear gloves when performing
step seven to minimize the danger of cutting your hands on the edge of the storm collar.
7. Place the storm collar around the chimney and put the collar together like a belt in belt loops.
Slide the end of collar under the two loops on the other end with the loops facing up. Overlap the
ends of the collar until it is tight against the chimney. Bend the free end of the collar back over
the loops to hold the storm collar securely together. The excess end of the storm collar may be
trimmed off.
8. Slide the storm collar down snugly against the flashing until the excess mastic left in step six is
forced up into the crack between the storm collar and the chimney. This should make the joint
between the flashing and the chimney watertight.
9. Install the chimney cap by placing the cap into matching parts of the last chimney section. Then
punch or drill 1/8 inch diameter holes in the inlet air duct (chimney pipe) where specified on the
brackets and fasten it down with the No. 8 screws provided. Do not penetrate the inner stainless
steel pipe while installing the screws.
10.Check all the parts of the fireplace, chimney and chimney termination cap to assure that no parts
have been damaged or bent during installation and that all parts have been installed properly.
NOTE: The metal used for the chimney cap has a rust protective coating but the cut edges of the
parts are not protected. To prevent rusting and rust staining of nearby structures, exposed parts of the
chimney and chimney cap should be detergent washed and painted with a galvanized primer paint.
53D9025
19
CHIMNEY HEIGHT AND OFFSET CHARTS
Height
(Inches)
35
39
47
52
58
64
70
75
82
87
94
99
105
111
117
122
129
134
141
146
152
158
164
169
176
181
188
193
199
205
211
216
223
228
235
240
246
252
258
263
270
275
282
287
293
293
305
310
317
322
329
334
340
346
352
357
364
369
376
20
1”
0
2
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
Intermediate
Sections
3’
1¹⁄₂’
0
1
1
0
0
0
1
1
0
0
1
0
0
2
1
0
0
1
1
2
0
0
1
1
0
3
1
0
0
2
0
2
0
1
1
2
0
0
1
1
0
3
1
0
0
2
1
3
0
1
1
2
0
0
1
1
0
3
1
0
0
2
1
3
0
1
1
2
0
0
1
1
0
3
1
0
0
2
1
3
0
1
1
2
0
0
1
1
0
3
0
0
0
2
1
3
0
1
1
2
0
0
1
1
0
3
1
0
0
2
1
3
0
1
1
2
0
0
4’
0
0
1
0
1
1
0
1
1
0
2
1
0
2
1
1
2
1
3
2
1
3
2
1
3
2
4
3
2
4
3
2
4
3
5
4
3
5
4
3
5
4
6
5
4
6
5
4
6
5
7
6
5
7
6
5
7
6
8
Elbow
Set
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1’
0
1
0
2
1
0
2
0
0
1
0
0
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
Chimney Sections
1¹⁄₂’
3’
0
0
0
0
1
0
0
0
1
0
0
1
1
0
0
0
1
1
0
0
1
0
0
2
1
0
0
1
1
2
0
0
1
1
0
3
1
0
0
2
1
3
0
1
1
2
0
0
1
1
0
3
1
0
0
2
1
3
0
1
1
2
0
0
1
1
0
3
1
0
0
2
1
3
0
1
1
2
0
0
4’
0
0
0
0
0
0
0
1
0
1
1
0
1
1
0
2
1
0
2
1
0
2
1
3
2
1
3
2
1
3
2
4
3
2
4
3
2
4
3
5
Total In.
Offset
4¹⁄₂
10
13
15¹⁄₂
18¹⁄₂
22
24
28
30¹⁄₂
33¹⁄₂
36¹⁄₂
39¹⁄₂
42
45¹⁄₂
48
51¹⁄₂
54
57
60
63
65¹⁄₂
69
71¹⁄₂
75
77¹⁄₂
80¹⁄₂
83¹⁄₂
86¹⁄₂
89
92¹⁄₂
95
98¹⁄₂
101
104
107
110
112¹⁄₂
116
118¹⁄₂
122
17
26¹⁄₂
31³⁄₄
36
41¹⁄₄
47¹⁄₄
50³⁄₄
57³⁄₄
62
67³⁄₄
72¹⁄₂
77¹⁄₂
82
88
92¹⁄₄
98¹⁄₂
102³⁄₄
107³⁄₄
113¹⁄₄
118¹⁄₄
122¹⁄₂
128³⁄₄
133
139¹⁄₄
143¹⁄₂
148¹⁄₂
154
159
163¹⁄₄
169¹⁄₂
173³⁄₄
180
184¹⁄₄
189¹⁄₄
194³⁄₄
199³⁄₄
204
210¹⁄₄
214¹⁄₂
220³⁄₄
Note For Straight Run Chimneys:
Chimney support required at 25’ chimney height.
Notes For Chimneys With Elbow Offsets:
The length of the inclined portion of the chimney between elbows must
not exceed 6 feet when unsupported, or 20 feet if the chimney is supported at 6 foot intervals using either metal support straps or an LCS
chimney support.
The LCS chimney support when installed at a 30 degree angle will
add 8” of rise and 4-5/8” of offset to the chimney height calculations.
53D9025
CHIMNEY CAP CHASE INSTALLATION
The preinstalled chimney sections should be no more than 13 inches below the top of the
chase. The installation should be planned so that either a two-foot or three-foot chimney section will be used for the top section. This is necessary to ensure complete engagement of the
inlet air telescope and chimney cap into the top section.
1. Extend the chimney sections until the top of the chimney is not more than 13 inches below
the top of the chase.
2. Center the hole in the chase cover over the chimney. The chase cover overhang should
be lanced, formed over the chase and secured with nails. This prevents water from
seeping under the chase cover. If two or more chase covers are to be used on the same
chase, they should be soldered together to form two watertight seams.
3. Place the outer telescope inside the hole in the chase cover and lower it down into the
mating pipe of the chimney until the support brackets on the telescope section rest on the
flange of the chase cover.
4. Bend the tab with a hole on each bracket outward and secure cap to flashing, using the
tabs provided.
5. Once the telescope is secured, place the rain shield over the top of the telescope pipe assembly. The rain shield will be supported by the telescope brackets.
CAUTION: Be careful around electrical wires to avoid the electrical shock hazard of contacting the wires with the metal chimney components.
NOTE: When two fireplace chimneys are terminated above the same chase, the centers of
the chimney caps should be at least 24 inches apart to help prevent smoke from a fireplace
in use from being drawn down the chimney of a fireplace that is not in use. Additional spacing between caps or staggering the height of the caps will further lessen the likelihood of this
occurring.
6. Place LCL cap assembly into position by aligning the flue telescope into the last section of
flue pipe and lower it down until the 3 cap legs rest on the top edge of the outer telescope
pipe. Secure legs of cap to the telescope with screws provided.
7. Check all parts of the chimney and chimney cap to assure that no parts have been damaged or bent during installation and that all parts have been installed properly.
NOTE: The metal used for the chimney and chimney cap has a rust-protective coating but
the cut edges of the parts are not protected. To prevent rusting and rust staining of nearby
structures, exposed parts of the chimney and chimney cap should be detergent-washed and
painted with galvanized primer paint.
Figure 20
LCL Chimney Cap Design
Incorporates Longer Duct
and Flue Pipe for Chase
Type Installation
Using Tabs Provided, Secure Outer
Telescoping to the Flat Flashing
On Large Chase Tops it is Recommended that
Cross Supports be used to Provide Additional
Support to Eliminate Sagging of the Flashing
Chase Top Flat Flashing Does
Not Require Venting or Standoff
Spacers Around Perimeter
13” Max. Space Between Chimney
Section and Chase Cover
2” Min.
Chase
1���” Min.
Overlap
Outer Telescope
Maintain 2” Minimum Air Space
Clearance to Combustibles
Above Roof Line
Roof Line
NOTE: Locally built chase flashings must incorperate a
13¹⁄₄ min. to 13³⁄₄ max. x 2” high min. flanged hole for proper
installation of the LCL chimney cap.
53D9025
FP1899
chimney cap
8/08
21
OUTSIDE COMBUSTION AIR PRECAUTIONS & RECOMMENDATIONS
NOTE: The use of outside air for combustion is optional unless required by building codes. It is
only necessary to supply outside combustion air to one side of the fireplace. Use the Model AK4
combustion air kit.
Secure Outside Air Starting Collar to Fireplace
Figure 21
Insulation Ring
Insert Shortest Side of the
Tube through the Fireplace
Outer Wrap to Properly
Seal Against Firebox Wall
and Gasket
Step 2: Secure outside duct to starting
collar with duct clamp or screws.
Longer Length of the Tube
to Outside
Step 1: Secure outside air starting collar to left side of fireplace with four (4) sheet metal screws provided.
NOTE: The starting collar extends through the outer fireplace
jacket and will seal against the firebox wall when secured as
indicated.
������
Fireplace Outer Wrap
���������������
����
AK4 Combustion Air
Kit (Shortest Toward
Firebox)
AK4 Mounting Plate
Second Floor
Firestop Spacer
Firebox Insulation Seal
Termination Cap
������
�������������������
����
Duct Extended
to Miss Joint
Firestop
Spacer
To Outside Wall
Installation Above Basement
or Crawl Space
8‘ Max. Inlet Grille in
CAUTION: Do not take
combustion air from attic space or garage.
Soffit
(Overhang)
�������
��������������
����
Concrete Slab Installation
(Optional Outside Air Runs)
22
FP1903
OA soffit install
8/08
53D9025
OUTSIDE COMBUSTION AIR PRECAUTIONS & RECOMMENDATIONS
Outside Combustion Air Recommendations (continued)
1. Extremely long runs and numerous turns in the duct leading from the fireplace to the combustion
air assembly should be avoided. These conditions will increase the resistance to the free flow of
air through the duct. Refer to Figures 1, 21, and 22 for methods of installing the outside air for
combustion assemblies.
2. The combustion air assembly should be located at an exterior location, which is not likely to be accidentally blocked in any manner. The assembly should be located above the snow line to prevent
blockage by snow accumulation.
3. The combustion air inlet assembly should never be mounted in a garage or storage area where
combustible fumes such as gasoline might be drawn into the fireplace.
4. Combustion air can be drawn form the crawl space under a house when an adequate supply of air
is provided by open ventilation.
5. Do not take combustion air from attic space or garage space.
Figure 22
Outside Air Control Lever
(Lift to Open, Pull Down
to Close)
6” Diameter Hole
Screw
Duct
Extending
3” min.
Nail
Holes
AK4 Inlet Air Vent
Screws
Installing Model 403 Duct Connector
1.
2.
3.
4.
Push insulation back approximately 2” from the end of each duct.
Slip each duct over duct connector until an equal length of connector extends into each duct.
������
Place duck clamp over the
end of each duct. Tighten duct clamp down snuggly.
�����������
Push insulation back into
place and over duct clamp.
����
2“
App.
������
Approximately
2”
����������������
Duct Connector
����
Screw
1
2
3
Loop Disengaged
Clamp Around
Duct
Slip Band
Through
Housing
Snap Screw
Down and
Tighten
Insulation
Band
Duct Clamp
23
53D9025
FP1906
Duct connector
8/08
������
COMBUSTION AIR ASSEMBLY
Model AK-4 Combustion Air Assembly
1. Remove the cover plate from the 4-inch outlet opening location on the left outside of the fireplace. DO NOT remove the cover if the outside air will not be connected.
2. Place the insulation ring between the AK-4 starting collar and fireplace wall and place the starting collar (4 inch) into the hole on the left side of the fireplace. Fasten it in place with the four
sheet metal screws provided.
3. Cut a 6-inch diameter opening for model AK-4 in the outside wall covering where the outside
vent is to be located.
4. Select and cut a piece of duct sufficient length to attach to the fireplace and protrude at least
three inches beyond the face of the wall to which the AK-4 inlet air vent will be attached. The
duct may be cut with a standard pocket knife (use FP-4 U duct for maximum efficiency and
safety). Do not use a combustible duct. Always use UL Listed Class 0 or 1 duct material.
5. If the duct is the insulated type, push the insulation back from one end of the duct approximately two inches.
6. Slip the exposed end of the duct over the starting collar on the fireplace.
7. Using the sheet metal screws provided, secure the duct end to the collar attached to the fireplace.
8. Nail or screw the combustion air assembly to the surface of the wall.
NOTE: If the wall covering is brick or stone, use appropriate masonry fasteners. Mount the combustion air assembly with “TOP’” upward to prevent cold air from entering through the wall. If it is
necessary to splice the duct, a model 403-duct connector should be used to splice duct sections.
24
53D9025
GAS APPLIANCE INSTALLATION
WARNING: Improper installation or operation of a gas appliance in this fireplace can allow unburned
gas to leak out which will cause a fire or explosion hazard, or the release of poisonous carbon monoxide into the dwelling which can cause serious injury or death to its inhabitants. To reduce these risks
to a minimum, the following important notices and instructions should be read and followed carefully.
IMPORTANT NOTICES:
1. The provision for a gas line is intended for connection to a decorative gas appliance which and
complies with the Standard for Decorative Gas Appliances for Installation in Vented Fireplaces,
ANSIZ21.60. If a decorative gas appliance is installed, it must be installed in accordance with the
National Fuel Gas Code, ANSIZ223.1.
CAUTION: “When a decorative gas appliance is installed, the fireplace damper must be fixed in a
manner which will maintain the minimum permanent vent opening at all times.”
If an unvented gas appliance (blue flame) is installed it must incorporate an automatic shutoff
device, and must be installed in accordance with with the National Fuel Gas Code Z223.1, Latest
edition.
CAUTION: If an unvented gas appliance is installed in the fireplace, the gas appliance must only
be operated with the fireplace glass door fully open (if included). Only unvented gas log set which
have been found to comply with the standard for unvented room heaters, ANSI/IAS/AGA Z21.11.2,
are to be installed in this fireplace. When an approved ANSI/IAS/AGA Z21.11.2 unvented room
heater is installed in this fireplace, a H2853 CANOPY must also be installed.
WARNING: Do not operate an unvented gas log set in this fireplace with the chimney removed.
The installer of the fireplace and gas appliance must describe the operation of the fireplace and
appliance to the people who will be operating them and leave all instruction manuals with the operator of the appliance.
2. An approved gas shut off valve must be located outside the fireplace in an area accessible to the
users of the fireplace.
3. All gas piping and fitting must be either steel or malleable iron. Unions must be of the ground joint
type.
4. Some code authorities prohibit or place restrictions on the use of gas appliances in fireplaces.
Check with local code authorities before proceeding with the installation.
5. The gas appliance and all connecting gas piping should only be installed by a licensed gas appliance installer.
The following instructions only apply to passing the gas line through the fireplace wall. Follow the
instructions provided by the appliance for the gas line, testing and adjusting it.
1.
2.
3.
4.
Locate the recessed area in the side refractory panel as shown by Figure 25.
Tap out a round hole in the brick liner with a hammer by tapping lightly on the recessed area.
Remove the two screws that hold the cover plates on the jacket wrap and discard the cover plate.
Use a screwdriver or similar tool to push the loose insulation out of the tube between the firebox
and the outer jacket of the fireplace.
5. Install the gas pipe through the tube between the firebox and jacket.
6. Attach the gas appliance to the gas pipe according to the appliance makers instructions.
53D9025
25
GAS APPLIANCE INSTALLATION
7. Pack the insulation removed in step 4 around the pipe to prevent air flowing through the tube
either into or out of the firebox.
8. Be sure the gas is turned off at the appliance, then turn the gas on at the cut off valve and test
the gas line connections for leaks with soapy water solution or a liquid leak detector. DO NOT
USE A MATCH OR OTHER FLAME SOURCE TO CHECK FOR GAS LEAKS. If a gas leak is
detected, turn the gas off immediately and fix the leak.
9. Proceed with testing the appliance for leaks and adjusting it as required by the manufacturer
instructions.
Figure 23
Gas Line Plumbing Detail
Outer Fireplace Wrap
Inner Fireplace Wrap
Side Brick
24” Max.
Fireplace Firebrick
Hearth Brick
Gas Line Access Tube
CAUTION: When using a gas appliance, the fireplace damper must be
set in fully open position.
Maintain 1/2” Minimum Air Space
Clearance to Combustibles for
Gas Line Out to 4” From Side of
the Fireplace
Back
Refractory
Brick
Side Refractory
Brick
Combustible Materials May Be Located
at Zero Clearance to Gas Line Beyond
4” From Fireplace Side.
Repack Insulation Around
Gas Line Where it Passes
Through Gas Line Access
Tube for Proper Seal
Knockout
�����
Applying Decorative Trim To The Fireplace
���������������������
Do not allow the trim materials to extend closer than 3/8 inch to the vertical edges of the firebox
����
opening if you plan to equip the fireplace with glass doors.
The face of your fireplace may be left exposed or trimmed with any noncombustible material
such as brick, stone or marble. If a trim is installed, be sure it is fastened snugly to the face of the
fireplace. A crack between the material and the face of the fireplace could pose a fire hazard and
impair the proper operation of the fireplace. Blocking the fireplace with framing and attaching the
base to the supporting floor will further reduce the possibility of such a crack developing.
Wall ties should be fastened to the face of the fireplace with sheet metal screws and placed in the
mortar joints of masonry trim.
Combustible material must not be installed below the top spacers of the fireplace or overlap the
sides of the fireplace face. Seal the face of the fireplace to the surrounding wall with non-combustible caulk or trim materials to prevent cold air leakage around the fireplace.
The trim should not block or restrict in any way the flow of air into the side air inlets in the face of
the fireplace.
Be sure to provide the required floor protection as described in a preceding section of this manual.
Combustible mantles and trim must be installed in accordance with the National Fire Protection
Association - ANSI NFPA 211 Standard - Section 7-2.3.3.
26
53D9025
TRIM AND DOOR INSTALLATION
Installation of Noncombustible Trim Materials to the Front Face of the Fireplace
Figure 24
Noncombustible Facing
Material
Use Only Noncombustible Materials
Below Top of Spacers
Combustible Framing Members
Facing Material to Top of
Spacers
Fireplace Face
Steel Lintel
(Optional)
CAUTION: Do not cover or
restrict vent areas with any trim
materials.
WARNING: The space between the face
of the fireplace and the noncombustible
facing material must be sealed. Failure to
properly seal this crack can cause a possible fire hazard and will void the MHSC
warranty.
CAUTION: Do not allow any trim materials to extend closer than 3/8 inch to the vertical edges of the
firebox opening if glass doors are to be installed.
Figure 24A
Mantel Installation
Combustible Framing
Members to Top of Spacers
12”
Max.
Combustible Mantel
Top Edge of Fireplace
�����
�������������������
18” Min. From Fireplace Opening to
����
Bottom of Combustible Mantel
(Manufacturuer Recommendation)
Top Edge of Fireplace
Opening
Figure 25
Combustible Surround Placement
M1002
Mantel install
8/08
Outline of
Fireplace
Firebrick
Combustible Surround Materials may be placed inside the
shaded areas. Combustibles
may not overlap edge of black
painted face more than 1/8”.
Extend line from opposite rear
corner of firebox past inside opening of the front face side panel.
2¹⁄₂”
(Ref.)
Do Not Restrict
Side Air Inlets
Glass Door Installation
This fireplace has been tested and listed for use with optional Model WSB48 glass doors.
For installation of the Model WSB48 glass doors, see the instructions provided with the doors.
53D9025
�����
��������������������
����
27
FIREPLACE OPERATION
WARNING: If a decorative gas appliance is used in the fireplace the fireplace damper must be
fixed in an open position. (See additional operation information in section titled “Operation Guidelines”.)
Advantages Of A Wood Burning Fireplace
These are the practical, ecological advantages of wood as a fuel. Also to be considered is the
aesthetic appeal. Most of us consider a wood fire with nostalgia. We enjoy the aroma, and find
the flickering light of a cozy hearth conductive to a happy remembrance of things past. Wood has
a low ash content. And the little ash that remains after burning is useful in home gardening as a
fertilizer and soil conditioner.WARNING: This appliance is not for use as cooking equipment.
Which Woods Are Best?
Each wood species offers something different in aroma or heat value, and you should consider
your needs and desires before building your fire.Softwoods, like pine, spruce, and fir are easy to
ignite because they are resinous. However, a fire built entirely of softwoods burns out quickly and
requires frequent replenishment. While a softwood fire is not too desirable for a long evening, it’s
fine in the morning when you want quick warmth, or late in the evening when you want a fire that
will burn out before you go to bed.On occasion when a longer fire is desired, it’s best to combine
softwoods with the heavier hardwoods such as ash, beech, birch, maple, oak and hickory. These
hardwood species burn less rapidly, with shorter flames, and produce steady, glowing coals.For
the most pleasing aroma, you’ll want to burn the wood of fruit trees such as apple and cherry,
or nut trees such as beech, hickory and pecan. Such wood is generally more expensive, but a
little combined with other wood, goes a long way. Start your fire with a mixture of softwood and
hardwood, then add some fruit or nut wood for nostalgic aroma. Since most woods will not burn
well when freshly cut, the wood you purchase should be reasonably dry. The sizes you buy are
dictated by the size of your fireplace. Purchase logs that will fit when laid across your grate, and
ask that the larger, heavier logs be split. Kindling should be short, easily split lengths of softwood,
lumber yard or mill scraps, or twigs and branches gathered from your yard.
How To Build A Better Fire
The first three fires should be of moderate size to allow the fireplace to adjust and the bricks to
cure before being subjected to larger fires.First, make sure your room is well ventilated, your
damper open and the flue is unobstructed. Then make sure your wood is dry and seasoned. Unseasoned wood burns poorly and coupled with poor ventilation or an obstructed chimney, leads
to smoking problems.If your fireplace is equipped with an outside combustion air assembly, open
the combustion air inlet by pushing upward on the lever located above the firebrick on the left side
of the firebox.
NEVER USE GASOLINE, GASOLINE-TYPE LANTERN FUEL, KEROSENE, CHARCOAL
LIGHTER FLUID, OR SIMILAR LIQUIDS TO START OR “FRESHEN UP” A FIRE IN THIS
FIREPLACE. KEEP ALL SUCH LIQUIDS WELL AWAY FROM THE FIREPLACE WHILE IT IS
IN USE. USE OF THIS FUEL CAN CAUSE A SERIOUS EXPLOSION.
Prepare your fire by placing two logs on the iron grate or fire basket, and laying the tinder between them. Tinder may be dry scrap paper, twigs, or bark. On top place a small handful of
twigs or split softwood kindling. Place more dry logs over this base. Keep logs close together,
as narrow air spaces between them promote better drafts, and heat reflected between adjacent
surfaces aids in raising and maintaining combustion temperatures.
28
53D9025
FIREPLACE OPERATION
You’ll need a minimum of three logs, preferably four, to make a good fire. Add kindling and new logs
as needed to rekindle a dying fire. New logs should be added at the rear grate after raking the coals
toward the front. DO NOT OVERFIRE THE FIREPLACE. Overfire conditions may be created by
large amounts of kindling, building scraps, or other improper fuels.
Ashes, important because they form a bed of glowing coals, should only be left to accumulate within
an inch or two of the bottom of the grate. Excess ashes can be used to check a flaming fire; or to
“bank” your fire, cover the logs with ashes. A “banked” fire will hold glowing coals for 8-10 hours,
thereby saving a fire for later use.
Wood vs. Fossil Fuels
Compared to fossil fuels, a full cord of dry hickory weighs about two tons and is approximately equal
in heating value to a ton of hard coal. On a pound basis, heavy hardwoods have about half the
heating value of coal. The tabulation shows the relative densities and heat values of a variety of dry
woods. Varieties at the top of the list (Dogwood) burn longer and those near the bottom (White Pine)
ignite and burn quicker. A combination of both light and heavy wood is desired.
Species
Dogwood
Hickory
Oak
Black Locust
Beech
Hard Maple
Birch
Apple
Density
.70-.79
.70-.74
.60-.73
.69-.70
.64-.66
.58-.65
.55-.64
.58-.62
Heat Value
100-107
100
86-99
95-98
89-91
83-88
79-86
83-84
Species
Ash
Southern Pine
Elm
Cherry
Douglas Fir
Spruce
Redwood
White Pine
Density
.57-.61
.51-.60
.50-.59
.50-.52
.45-.51
.41-.44
.33-.40
.35-.37
Heat Value
81-82
73-81
71-80
70
64-69
59
47-54
50
A Few Words Of Caution
Beware of burning certain material in your fireplace. Among these are plastics, poison ivy twigs and
stems, and chemically treated woods such as discarded poles and railroad ties. These not only create air pollution, but can induce extreme irritation for some individuals.
Use hemlock, spruce, juniper and other resinous woods with caution. They contain moisture pockets
which, upon heating, “pop” with considerable vigor.
Always use a fire screen. And always “bank” a fire, or at least push all unburned fuel to the rear of
the grate before leaving a fire unattended. Do not use this fireplace as an incinerator.
Because the termination of the chimney above the roof is exposed to wind and cold and the pressure
changes these and other environmental conditions may cause, a sufficient chimney draft may be hard
to establish at times. At other times the draft may be sufficiently disrupted to cause smoke to spill
from the fireplace opening. If problems with chimney draft occur, help start chimney draft before you
build a fire by holding a piece of burning paper near the flue opening at the top of the firebox to preheat the chimney. If smoke spills from the fireplace opening after the fire is burning, open a window
on the up wind side of the house that is far enough away form the fireplace that the wind will not blow
across the fireplace opening, push the burning wood as near the back of the fireplace as possible,
and if the fireplace is equipped with glass doors, close them.
DO NOT LEAVE CHILDREN OR PHYSICALLY OR MENTALLY HANDICAPPED, OR SENILE PERSONS ALONE WITH A BURNING FIREPLACE.
53D9025
29
MAINTENANCE & SAFETY
Fuel Storage
Wood can be dried sufficiently for burning within a few weeks if protected form rain in a low humidity area. It is far better to cut wood and allow it to dry for a year. In all cases, the wood should
be stacked so that both ends of the sticks are exposed to the air and protected from rain. The drier the wood, the more usable heat produced by the fire and less likely rapid accumulation of soot
and creosote within the chimney is to occur. See the section of this manual concerning chimney
maintenance for information concerning the hazards of soot a creosote accumulation. Small
quantities of wood required for fire tending must be kept at least 30 inches from the fireplace.
Disposal Of Ashes
Ashes should be placed in a metal container with a tight fitting lid. The closed container of ashes
should be placed on a noncombustible floor or on the ground well away from all combustible
materials pending final disposal. If the ashes are disposed of by burial in soil or otherwise locally
dispersed, they should be retained in the closed container until all cinder has thoroughly cooled.
Ashes should never be placed in a container with combustible materials.
Chimney Maintenance
Creosote, Formation and Need for Removal: When wood is burned slowly, it produces tar and
other organic vapors, which combine with expelled moisture to form creosote. The creosote
vapors condense in the relatively cool chimney flue of a slow-burning fire. As a result, creosote
residue accumulates on the flue lining. When ignited, this creosote makes an extremely hot fire.
The chimney should be inspected at least twice a year during the heating season to determine if
a creosote buildup has occurred.
If creosote has accumulated it should be removed to reduce the risk of a chimney fire.
The chimney cap can be removed for inspection, maintenance and cleaning by removing three
screws from the support legs and lifting upward.
When the fireplace is first in use, inspect the chimney frequently and clean the chimney any
time an accumulation is observed on the flue walls. The frequency of these inspections can be
increased or reduced appropriately after a pattern of accumulation has been established. Please
note, however, that changes in the outside environmental conditions such as temperature and
humidity or changes in the operation of the fireplace can lead to rapid buildup of soot and/or
creosote.
To clean the chimney, obtain the services of a qualified and reputable chimney sweep, or remove
the accumulation with brushes on wooden or fiberglass poles. Do not use metal pipes, chains,
wires, etc., to clean the chimney because such items can scratch the surface of the stainless
steel flue which can shorten the life of the flue and provide a rough surface for soot particles to
attach to.
Be sure to cover nearby furnishing and arrange some method of catching soot and creosote
particles that may fall during the chimney cleaning process. If glass doors are installed on the
fireplace, they should be closed. Extra caution must be used to avoid damage to the flue damper
during the cleaning process.
In addition to checking and cleaning the chimney on a regular basis, be sure to inspect the
chimney before starting a fire at the beginning of each heating season. Make sure the chimney is
clear from any accumulation of soot, creosote or any other debris, and that all joints are intact.
MHSC does not recommend chemical cleaners because some may contain elements that corrode the metal parts of the chimney or fireplace.
30
53D9025
MAINTENANCE & SAFETY
Fireplace Maintenance
At the end of each heating season or when the fireplace will not be in use for an extended time, the
ashes should be removed and the hearth area should be swept as clean as is practical. The slow
absorption of moisture into the ashes over a long period of time could cause a condition which would
be corrosive to the metal fireplace parts.
At the beginning of each heating season, always operate the flue damper and make sure it has not
become stuck from soot, creosote, etc., during the period of inactivity.
Keep the lower and upper grille panels clean and free from dirt and lint accumulation at all times to
get the maximum efficiency from your fireplace.
As you use the fireplace, expansion and contraction will cause minor cracking of the hearth, back,
and side refractory materials. This is normal and unavoidable. If the cracks become large enough or
parts dislodge and metal behind the refractory is exposed, the refractory panels should be replaced
with new panels that can be obtained from you fireplace dealer.
Glass Door Maintenance
For glass door maintenance, see instructions provided with the glass doors.
Checklist of Do’s and Dont’s
DO’S
1. Do check with local building officials to be sure the installation of the fireplace complies with all
building codes and requirements and obtain required building permits. Do plan your installation
with safety as you primary consideration.
2. Do use only the prescribed material and parts for the installation of the fireplace.
3. Do insulate the exterior walls surrounding the fireplace to prevent excessive heat loss from the
fireplace.
4. Do trim the face of the fireplace only with noncombustible materials.
5. Do attach the noncombustible face trim material firmly to the face of the fireplace.
6. Do block in or fasten the fireplace to prevent the possibility of the fireplace shifting out of position.
7. Do enclose the chimney where it passes through living spaces or spaces accessible for storage
purposes to prevent contact with and possible damage to the chimney.
8. Do install firestop spacers at each ceiling level when the chimney is installed in a multistory building.
9. Do install the proper chimney cap or chimney housing on the chimney to prevent rain and debris
from entering the chimney.
10. Do keep all flammable liquids, gases and pressurized containers away form the fireplace.
11. Do check the fireplace for proper adjustment and operation before leaving it unattended for long
periods of time.
12. Do inspect and clean the fireplace chimney regularly.
13. Do keep the fire screens closed when the fireplace is left unattended to minimize the danger of
sparks popping out of the fireplace.
14. Do use the grate furnished with and for this fireplace.
15. Do start a fire only with paper, kindling or solid composition fire starters specifically designed for
starting a fire. The use of liquid fire starter can cause an explosion within the fireplace.
16. Do place all ashes in a metal container with a tight fitting lid and place them on a noncombustible
surface well away from other combustible materials until they have completely cooled.
53D9025
31
MAINTENANCE & SAFETY
18. Do store your fuel supply at a distance equal to or greater than the spacing recommended for combustible materials from the fireplace.
19. Do build fires of moderate intensity in the fireplace for the first three fires to allow materials to adjust
and cure before being subjected to the intense heat of a large fire.
DONT’S
1. Don’t allow other installations or operation considerations to take priority over safety considerations.
2. Don’t attempt to use the fireplace until the installation is complete.
3. Don’t use unlisted parts and accessories with the fireplace except for special flashings that may be
fabricated locally.
4. Don’t use damaged parts or accessories with this fireplace.
5. Don’t install the fireplace in an exposed or uninsulated area.
6. Don’t install the fireplace over carpeting.
7. Don’t install the fireplace on a poorly constructed base or fail to fasten down or attach the fireplace to
prevent it from shifting out of position.
8. Don’t create or allow a crack to develop between the metal face of the fireplace and noncombustible
trim.
9. Don’t install the fireplace where flammable or explosive liquids or vapors are likely to be present.
10. Don’t neglect all the considerations mentioned in this manual concerning clearances to combustibles,
spacing from obstructions and proper chimney height when selecting the location and installing the
chimney.
11. Don’t allow insulating materials to contact the chimney.
12. Don’t forget to support flat chase flashing to prevent water from puddling.
13. Don’t neglect to apply caulking or mastic to the required joints of the flashing and between the flashing roof.
14. Don’t dry clothing or other articles near the fireplace.
15. Don’t store or place flammable liquids, gases or pressurized containers near the fireplace.
16. Don’t neglect to instruct all responsible persons in the proper and safe operation of the fireplace.
17. Don’t fail to instruct all persons, especially children and elderly persons, concerning the hazards of
improper operation and unauthorized tampering with the fireplace.
18. Don’t use this fireplace to burn paper, cardboard, or other debris.
19. Don’t neglect to inspect and clean the chimney regularly.
20. Don’t operate the fireplace with the glass fire screen doors partially open. The doors should always
be fully open or fully closed.
21. Don’t use gasoline, kerosene, engine oil,or charcoal lighter fluid.
22. Don’t store fuel supply closer to the fireplace than the minimum spacing required for combustible
materials.
23. Don’t subject the fireplace to the intense heat of a large fire the first three times the fireplace is used,
but build moderate fires to allow the materials to cure and adjust.
24. Don’t clean the chimney with metallic devices or chemical cleaners.
25. Don’t use the fireplace or chimney for venting wood or coal burning heaters or inserts unless approved in writing by MHSC.
26. Don’t put combustibles within 28 inches of the fireplace opening.
“WARNING: IF NOT INSTALLED, OPERATED AND MAINTAINED IN ACCORDANCE WITH THE
MANUFACTURERS INSTRUCTIONS, THIS PRODUCT COULD EXPOSE YOU TO SUBSTANCES IN
FUEL OR FROM FUEL COMBUSTION WHICH CAN CAUSE DEATH OR SERIOUS ILLNESS AND
WHICH ARE KNOWN TO THE STATE OF CALIFORNIA TO CAUSE CANCER, BIRTH DEFECTS OR
OTHER REPRODUCTIVE HARM. ALSO, OPERATION, INSTALLATION AND SERVICING OF THIS
PRODUCT COULD EXPOSE YOU TO AIRBORNE PARTICLES OF GLASS WOOL FIBERS KNOWN
TO THE STATE OF CALIFORNIA TO CAUSE CANCER THROUGH INHALATION.”
32
53D9025
PARTS DIAGRAM AND LIST
All repair part orders should be placed through your local dealer. To ensure prompt and accurate service, please provide the following information when placing a repair part order: Model number of your
Appliance, Part Name, Part Number, and Quantity of parts needed.
Technical Service Department
MHSC
149 Cleveland Drive
Paris, KY 40361
www.mhsc.com
1
10
Figure 26
9
SB4800
8
2
3
7
6
5
4
(not shown)
Key
No.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
53D9025
Part Name (Noun first)
Weldment Damper Weight
Handle Damper
9025
Firebrick
Back
Assy.
SB4800
parts
Firebrick,
Rt.
Side
Assy.
8/08
Hearth Refractory
Grate Painted Assy.
Panel Firescreen w/ull
Firebrick, Lt. Side Assy.
Weldment OSA Rod/Plate
Rod Damper
Qty.
1
1
1
1
1
1
2
1
1
1
Part No.
053127
037391
052857
050447
052779
052874
052736
050448
050918
047647
33
PARTS DIAGRAM AND LIST
All repair part orders should be placed through your local dealer. To ensure prompt and accurate service, please provide the following information when placing a repair part order: Model number of your
Appliance, Part Name, Part Number, and Quantity of parts needed.
Technical Service Department
MHSC
149 Cleveland Drive
Paris, KY 40361
www.mhsc.com
1
10
9
Figure 27
SB4800HB
8
2
3
7
6
5
4
(not shown)
Key
No.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
34
Part Name (Noun first)
Weldment Damper Weight
9025
Handle Damper
SB4800HB parts
Firebrick8/08
Back Assy.
Firebrick, Rt. Side Assy.
Hearth Refractory
Grate Painted Assy.
Panel Firescreen w/ull
Firebrick, Lt. Side Assy.
Weldment OSA Rod/Plate
Rod Damper
Qty.
1
1
1
1
1
1
2
1
1
1
Part No.
053127
037391
067516
n/a
070034
052874
052736
067514
050918
047647
53D9025
NOTES
53D9025
35
NOTES
36
53D9025
NOTES
53D9025
37
LIMITED WARRANTY
FACTORY-BUILT FIREPLACE AND COMPONENTS
(except blowers)
What is Covered and For How Long
• Five-Year Coverage - For five years from the date this fireplace and components are first purchased for use,
MHSC will, at its option, repair or replace any defective part of this fireplace or components, or refund to you a sum
not to exceed the factory retail price in effect at the time of purchase.
• Ten-Year Coverage - From the sixth through the tenth year following the date this fireplace or accessory is first
purchased for use, MHSC will make available to you, at our factory, a free replacement for any defective part in this
fireplace or accessory.
• Twenty-Five-Year Availability of Replacement Parts - From the eleventh through the twenty-fifth year following
the date this fireplace or accessory is first purchased for use, MHSC will make available at our factory replacement
parts for this fireplace or accessory, which you may purchase for the list price current at the time your purchase
order is received.
What is Not Covered
This limited warranty does not cover:
•
•
•
•
•
Transportation or shipping cost.
The cost of a service call to diagnose trouble.
Painted surfaces.
Damage or defect caused by improper installation, accident, misuse, abuse or alteration.
Poor ventilation of smoke or gases caused by air-conditioning and heating systems, exhaust fans or pressure differentials produced by wind.
• Broken glass components.
• Cracks in ceramic and castable parts that do not affect safe operation.
• We do not warrant this fireplace to be in compliance with your local building code. Building codes vary greatly
throughout the country, and you should determine whether your local building code contains restrictions on the use
of this fireplace before you purchase it.
• Blowers or fans, which are warranted separately.
• Heat loss due to the passage of heat or air through or around the fireplace.
Also, under our five year coverage, we do not pay the cost of removal and replacement of any portion of the structure
in which the fireplace is situated, made necessary by the repair, removal or re-installation of the fireplace.
And under our twenty-five year warranty of availability of replacement parts, we only promise to maintain a supply of
replacement parts at our factory for you to purchase.
Limitations and Exclusions
1. No one has authority to add to or vary this limited warranty, or to create for MHSC any other obligation of liability in
connection with this fireplace and accessory.
2. MHSC shall not be liable for incidental, consequential, special or contingent damages you might suffer as a result
of its breach of the written warranty or any implied warranty. Some states do not allow the exclusion of limitation of
incidental or consequential damages, so the above limitations may not apply to you.
3. This warranty applies only to the original purchaser of the fireplace or to the original owner of the dwelling when the
fireplace is installed in a new dwelling and may not be transferred.
4. This warranty applies only to a fireplace sold and used in the United States.
Your Duties
This fireplace must be installed by a qualified installer according to your local building codes and installation instructions and operated according to the owner’s instructions. You must keep an invoice, canceled check or payment
record to verify the purchase date of the fireplace.
If Warranty Service is Needed...
1. Contact your supplier. Make sure you have your warranty, your sales receipt and the model/serial number of your
MHSC product.
2. DO NOT ATTEMPT TO DO ANY SERVICE WORK YOURSELF.
38
53D9025
ATTENTION
APPLIANCE
INSTALLER
PLEASE RETURN THESE OPERATING
AND INSTALLATION INSTRUCTIONS
TO THE APPLIANCE FOR
CONSUMER USE.
53D9025
39
MHSC
149 Cleveland Drive • Paris, Kentucky 40361
www.mhsc.com
AUGUST 2008
53D9025 • Rev. 3
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