Monessen hearth Radiant wood burning hwb800hb User manual

HWB800HB MODEL

RESIDENTIAL FIREPLACE

INSTALLATION, OPERATION AND MAINTENANCE MANUAL

THIS FIREPLACE IS LISTED BY OMNI-TEST LABORATORIES FOR USE WITH "L" SERIES CHIMNEY SYSTEM

COMPONENTS.

53D9037. Rev 1 03/03

1

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.

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 OMNI-Test 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.

TABLE OF CONTENTS

Listing and Code Approvals..........................................................................................................1

Important Information...................................................................................................................2

Operation Guidelines...................................................................................................................3

Clearances ........................................................................................................ ......4-5

Fireplace Location .......................................................................................................6

Installation Preparation .............................................................................................7-8

Floor Protection ... ...................................................................................................9-10

Fireplace Components .........................................................................................11

Fireplace Installation ..........................................................................................12

Chimney Installation .............................................................................................................12-14

Chimney Offset Installation ...................................................................................15-16

Chimney Cap Installation ......................................................................................................17-18

Chimney Cap Chase Installation ...............................................................................................19

Outside Combustion Air Precautions and Recommendations ..............................................20-21

Combustion Air Assembly ........................................................................................................22

Gas Appliance Installation ....................................................................................................23-24

Trim and Door Installation ........................................................................................................25

Fireplace Operation ..............................................................................................................26-27

Maintenance and Safety .......................................................................................................28-30

Repair Parts Diagram and List ..................................................... .............................................31

Warranty..............................................................................................................................33-34

CONGRATULATIONS!

53D9037. Rev 1 03/03

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.

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 Monessen Hearth

Systems 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 Monessen Hearth Systems.

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. Damage to the fireplace from overheating.

2. Hazardous temperatures to develop on combustible materials adjacent to the fireplace or chimney.

3. The emission of smoke, sparks or hazardous gases into the dwelling.

4. Leakage of rain water into the dwelling.

2

IMPORTANT INFORMATION

53D9037. Rev 1 03/03

5

3

OPERATION GUIDELINES

When a AK4 combustion air assembly and a combustion air duct are attached to the connecting point on the

left or right side of the fireplace, combustion air may enter the firebox through a dampered opening behind the

left or right side brick. 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 and right side of the firebox near the top of

the 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. See Figure 22 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 also is 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

072954 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, Monessen Hearth Systems is

not responsible for heat loss or air infiltration through or around the fireplace.

53D9037. Rev 1 03/03

6

4

CLEARANCES

FIGURE 1

RESIDENTIAL INSTALLATION

58"

MAINTAIN 2" MIN. AIR SPACE

BETWEEN CHIMNEY AND

COMBUSTIBLES

L12 (1' PIPE)

L18 (11/2' PIPE)

L36 (3' PIPE)

L48 (4' PIPE)

FLUE OUTLET HEIGHT

18 FT=MIN. HEIGHT (NO OFFSETS)

24FT=MIN. HEIGHT (2 30

˚ELBOWS)

ELBOWS)

30 FT=MIN. HEIGHT (4 30

˚ELBOWS)

ELBOWS)

86FT=MAX. HEIGHT (CHIMNEY SUPPORT

86FT=MAX. HEIGHT (CHIMNEY SUPPORT 

EVERY 25 FT)

FIRESTOP MODEL LF-FS-2

(REQUIRES 17x17 FRAMING)



60"

STORM COLLAR

MODEL LC CHIMNEY CAP

ROOF FLASHING

MODEL 612

CAUTION:

DO NOT RESTRICT SIDE AIR

INLET VENTS WITH SURROUND

OR TRIM MATERIALS

GALVANIZED METAL STRIP

NAIL TO FRAMING MEMBERS

SB6000

FIREPLACE MODEL

FLEXIBLE DUCT TYPE

FP-4-U

COMBUSTION AIR 

ASSEMBLY

NOTE: IF MODEL WSB60 GLASS DOORS ARE TO BE USED, NON-COMBUSTIBLE TRIM

ATTACHED TO THE FACE OF THE FIREPLACE MUST NOT EXTEND OVER THE SCREEN

COVER AT THE TOP OF THE FIREBOX OPENING. THE SCREEN COVER WILL HAVE TO 

BE REMOVED BEFORE MODEL WSB60 GLASS DOORS CAN BE INSTALLED. NON-

COMBUSTIBLE TRIM MUST NOT EXTEND OVER EACH SIDE OF THE FIREPLACE INTO 

THE FIREBOX OPENING TO AVOID INTERFERENCE WITH INSTALLATION OF THE

MODEL WSB60 GLASS DOORS.



53D9037. Rev 1 03/03

5

CLEARANCES

NOTE: DIMENSIONS MAY VARY SLIGHTLY DUE TO MANUFACTURING TOLERENCES.

4 5/16

16 1/16

9 13/16

25 9/16

12 3/16

30 3/4

21 13/16

46 3/8

27 13/16

56 3/4

30 5/16

61 11/16

LE30

ELBOW

L12

L18

L36

L48

L18

L36

39 5/16

76 11/16

"L" SERIES CHIMNEY SECTIONS

47 5/8

47

L48

35 5/8

35

17 5/8

17

11 5/8

11

L18

L36

L12

L18

34 5/8

34 LINEAR GAIN

L18

L36

52 LINEAR GAIN

52 5/8

L36

70 5/8

70 LINEAR GAIN

13" O.D. 

OUTER PIPE

11" I.D. FLUE 

4 1/2

38 1/2

59

50

28 1/2

17 1/2

11

OUTSIDE AIR 

OPENING

GAS LINE 

OPENING

8

9 1/2

18

13 1/4

8

30

11

38

58

66 1/2

FIGURE 2

FIGURE 3

53D9037. Rev 1 03/03

FIREPLACE LOCATION

CAUTION: Do not install fireplace over carpeting.

This fireplace does not weigh more than large pieces of furniture and can normally be located near a load

bearing wall without requiring additional foundations or supports. If however, the fireplace is to be trimmed

with a heavy stone or brick facing and hearth extension, be sure the supporting structure is adequate.

Figures 4 and 5 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.

6

FIGURE 4

FIGURE 5

FULL PROJECTION

FLUSH

CORNER

SIDE WALL INSTALLATION

60

69 5/8

(MIN)

CORNER INSTALLATION

19 1/4

CLEARANCE

AIR SPACE

1 1/2

24

MIN

(MIN)

30

(MIN)

98 1/2

SCREENED OPENING

53D9037. Rev 1 03/03

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 8. 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 6. Failure

to insulate the fireplace form outside temperatures will cause heat loss through and around the fireplace.

INSTALLATION PREPARATION

7

FIGURE 6

53D9037. Rev 1 03/03

8' 0"

LEVEL

SOLID

SURFACE

FIRESTOP SPACER

SEE NOTES



JOIST INSULATE SAME

AS CEILING

NOTES:

1. MODEL LF-FS-2 FIRESTOP 

SPACER MUST BE USED.

2. LOCAL CODES MAY NOT REQUIRE

FIR E 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 

OUTSIDE BASE

INSULATION

(THERMAL BARRIERS)

SOLID CONTINUOUS

SOLID CONTINUOUS

SURFACE

INSULATE OUTSIDE

INSULATE OUTSIDE 

WALLS OF CHASE

CHIMNEY SECTIONS

CHIMNEY SECTIONS

"L" SERIES

LCLF FLAT CHASE 

TOP FLASHING

LCL TELESCOPING

CHIMNEY CAP

INSTALLATION PREPARATION

8

MULTIPLE STORY INSTALLATION

ATTIC SPACE

SINGLE STORY INSTALLATION WITH

POOR 

LOCATION

PREFERRED 

LOCATION

2" MIN. CLEARANCE 

TO COMBUSTIBLES

"L" SERIES CHIMNEY COMPONENTS

FIRESTOP SPACER

LF-FS-2 (2" AIR SPACE

CLEARANCE TO 

COMBUSTIBLES

17" SQUARE

OPENING

IN JOIST



18 FT MIN.

SEE TABLE 1 FOR

ROOF OPENING

SIZE

3 FT. MIN. OR 2' ABOVE

ANY POINT WITHIN 10'

ATTIC SPACE

FLUE OUTLET HEIGHT

STORM COLLAR

FLASHING

(612 OR 1212)

LC CHIMNEY CAP

FIRESTOP SPACER

LF-FS-2 (2" AIR SPACE

CLEARANCE TO 

COMBUSTIBLES)

17" SQUARE

OPENING IN

JOIST

17" SQUARE

OPENING IN

JOIST

(612 OR 1212)

FLUE OUTLET HEIGHT

2" CLEARANCE TO

COMBUSTIBLES (MIN.)

3 FT. MIN.

HEIGHT - 86 FT. CHIMNEY

MAX. INSTALLATION

SECOND FLOOR AREA

FIRST FLOOR AREA

THIRD FLOOR AREA

ATTIC SPACE

MODEL LC

CHIMNEY CAP

STORM COLLAR

(INCLUDED WITH CAP)

FLASHING

17" SQUARE

OPENING IN

JOIST

SEE TABLE 1 FOR

ROOF OPENING SIZE

FIRESTOP SPACER

LF-FS-2 (2" AIR SPACE 

CLEARANCE TO 

COMBUSTIBLES

FIRESTOP SPACER

LF-FS-2 (2" AIR SPACE

CLEARANCE TO 

COMBUSTIBLES)

FIGURE 7

FIGURE 8

FIGURE 9

53D9037. Rev 1 03/03

9

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 10, a H2074 hearth exten-

sion kit or a locally constructed hearth equivalent to the H2074.

The H2074 hearth extension kit consists of sufficient insulation board to cover the 20" x 74" floor area with ˚

inch layer of insulation. A 20" x 74" 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 H2074 hearth extension has a thermal conductivity (K factor) of 0.43. If you do

construct a hearth extension equivalent to the H2074, 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 H2074.

FIGURE 10

FIGURE 11

SCREENED 

OPENING

FIREPLACE AND HEARTH EXTENSION AND TOP VIEW

SB6000 MINIMUM HEARTH EXTENSION DIMENSIONS

NOTE: A hearth extension placed on a combustible

NOTE: A hearth extension placed on a combustible 

floor must be constructed with rigid insulation which

floor must be constructed with rigid insulation which

has a minimum "R" value of 1.16 or a "K" value of 

0.43. The insulation must be covered with a 

non-combustible covering such as a tile stone, 

marble, or a piece of 0.018 minimum sheet metal

which is needed to protect the insulation. Follow 

instructions provided with the fireplace for all other

specifications and directions for proper installation

of the fireplace and hearth extension.

20"

12"

74"

12"

(MIN.)

20"

(MIN.)

6"

(MIN.)

ALTERNATE BRICK OR STONE

HEARTH EXTENSIONS FOR USE

WITH THE SB6000 FIREPLACE

WHEN PLACED OVER A COM-

BUSTIBLE FLOOR WITHOUT 

INSULATION BOARD PROTECTION

SB6000

FIREPLACE

HEARTH

BRICK OR STONE HEARTH

EXTENSION - 74" LONG MIN.

SAFETY STRIP IS REQUIRED WHEN 

UNIT IS PLACED ON A COMBUSTIBLE FLOOR 

OR PLATFORM.

12"

(MIN.)

53D9037. Rev 1 03/03

WARNING: THE HEARTH EXTENSION AND THE 

METAL SAFETY STRIP SHOULD BE INSTALLED 

ONLY IN A HORIZONTAL RELATIONSHIP TO THE

FIREPLACE, AS ILLUSTRATED.

METAL

SAFETY STRIP

HEARTH EXTENSIONS

FLOOR LINE WITH RAISED HEARTH

TOP OF 

RAISED HEARTH

12" (MIN) 20"

(MIN)

12" (MIN)

METAL

SAFETY 

STRIP

58"

30"

74"

COMBUSTIBLE

COMBUSTIBLE 

FLOOR

59"

28 1/2"

20"

HEARTH 

PROTECTOR

FIGURE 13

FIGURE 12

The ability of insulating material to retard the transfer of heat may be expressed as either Thermal Conduc-

tance (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 thickness2

(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)

FLOOR PROTECTION

With either type hearth extension minor shifting of the supporting floor or expansion and contraction may

eventually cause a crack to develop between the hearth extension and the face of the fireplace. To help

prevent the crack from developing, the hearth extension materials must be firmly fastened in place. Wall ties

should be screwed to the face of the fireplace and imbedded in the mortar joints of brick, stone, or other 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 10,

12, and 13. 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.

10

53D9037. Rev 1 03/03

11

FIREPLACE COMPONENTS

FIGURE 14

LE30

30

˚ELBOW SET

ELBOW SET

LCS

CHIMNEY SUPPORT

LCLF FLAT WASHER 

36" x 72" (13-1/2" DIA. HOLE)

AK4 COMBUSTION

AIR ASSEMBLY

WSB60

GLASS DOORS

L48 L36 L18 L12

CHIMNEY SECTIONS

SB6000

LCL TELESCOPING

CHIMNEY CAP

LC

CHIMNEY CAP

612-1212

FLASHING

LF-FS-2

FIRESTOP SPACER

H2074

HEARTH EXTENSION

KIT

H2074

WSB60

AK4

LCLF

403

FP-4-U

LF-FS-30

LF-FS-2

1212

612

LCL

LC

LCS

LE30

L12

L18

L36

L48

SB6000

MODEL NUMBER

Hearth extension-protects floor against sparks and radiant heat (residential ins

tallation) 20"x74".

Optional polished brass glass door kit.

4-inch outside combustion air assembly.

3'x7' Flat chase flashing. For use with LCL chimney cap.

4-inch duct connector (for splicing FP-4 ducts). Includes two clamps.

4-inch insulated combustion air duct-8-foot lengths.

Firestop spacer--for 30 degree chimney incline through ceiling or floor.

17-inch firestop spacer. One required at each ceiling or floor level.

6/12-12/12 pitch flashing for contemporary installation.

0-6/12 pitch flashing for contemporary installation.

Round telescoping chimney cap. For use with flat chase top terminations.

Round chimney cap for contemporary installation. Includes storm collar.

Chimney support (required when chimney height exceeds 30 feet)

One pair of 30-degree elbows. Maximum-two pairs (4 elbows per chimney)

1-foot chimney section (11-inch diameter flue/13" dia. outer pipe)

1 1/2- foot chimney section (11-inch diameter flue/13" dia. outer pipe)

3-foot chimney section (11-inch diameter flue/13" dia. outer pipe)

4-foot chimney section (11-inch diameter flue/13" dia. outer pipe)

See installation instructions for details.

50 Inch front opening fireplace. Includes firescreen, sealing flue damper and ou

tside combustion air

capability. When installed, outside combustion air can be connected to either le

ft or right side.

DESCRIPTION

53D9037. Rev 1 03/03

FIREPLACE INSTALLATION

12

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 27 for proper identification of parts.

Do not substitute parts. Use only parts listed for use with the Model HWB800HB fireplace.

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 1, 2, 4, & 5

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.

53D9037. Rev 1 03/03

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.

24" MIN.

36"

24" MIN.

36"

10'

CHIMNEY INSTALLATION

13

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 16. 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 17. You must use

at least two 8-penney nails per strap.

FIGURE 15

53D9037. Rev 1 03/03

CHIMNEY INSTALLATION

14

IMAGINARY

CENTER POINT

ACTUAL

CENTER POINT

CENTERLINE 

OF CHIMNEY

PLUMB BOB

PLUMB LINE

TABLE 1

MINIMUM REQUIRED ROOF OPENING

MINIMUM FRAMED OPENING

"L" SERIES 

DOUBLEWALL CHIMNEY



17" x 17"

17" x 17" 1/8"

17" x 17" 1/4"

17" x 17" 1/2"

17" x 17" 3/4"

17" x 18" 1/4"

17" x 18" 3/4"

17" x 19" 3/8"

17" x 20"

17" x 20" 5/8"

17" x 21" 3/8"

17" x 22" 1/4"

17" x 23"



ROOF PITCH



0/12

1 12

2/12

3 12

4/12

5 12

6/12

7 12 

8/12

9 12

10/12

11 12 

12 12

INSTALLATION OF FIRESTOP-SPACER AT FLOOR LEVELS

INSTALLATION OF FIRESTOP-SPACER AT ATTIC LEVEL

FLUE PIPE

FIRESTOP SPACER

FLOOR JOIST

HEADER

CHIMNEY SECTION

INLET AIR PIPE

FIRESTOP SPACER

CHIMNEY SECTION

CEILING JOIST

INLET AIR PIPE

HEADER

OUTER PIPE

FLUE

SUPPORT STRAPS 

FASTEN SECURELY

FIRESTOP

CHIMNEY 

SUPPORT

SNAP LOCK CHIMNEY

SUPPORT SECURELY 

TO LOWER PIPES 

BEFORE FASTENING

SUPPORT STRAPS

FIGURE 16

FIGURE 17

FIGURE 18

53D9037. Rev 1 03/03

CHIMNEY OFFSET INSTALLATION

15

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.

3. The limitations on the quantity of elbows per chimney are as follows: If the total height of the fireplace 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.

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 18.

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.

FIGURE 19

FLUE PIPE

INLET AIR PIPE

30

˚ELBOW

ELBOW

ALL FOUR SUPPORT

STRAPS MUST BE NAILED

ON TO FRAMING MEMBER

AROUND THE ELBOW WITH 

A MINIMUM OF TWO (2)

8-PENNY NAILS PER STRAP

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

REQUIRED TO BE SECURED FOR

ADDED STABILIZATION OF PIPE

53D9037. Rev 1 03/03

CHIMNEY HOUSING

INSTALL ROUND CHIMNEY CAP OR

CONTINUE CHIMNEY TO PROPER HEIGHT AND

STORM COLLAR

FLASHING

ROOF

FIRESTOP SPACER AS REQUIRED

HEIGHT IS 24 FT. OR MORE.

WHEN TOTAL INSTALLATION

TWO ELBOWS MAY BE USED

NOTE:

FASTEN SUPPORT STRAPS SECURELY

USE OF LF-FS-2 FIRESTOP

COMBUSTIBLES WITH

CLEARANCE TO

2" MIN. AIR SPACE

L

C

IN ACCESSIBLE AREAS.

VERTICAL CHIMNEY

ENCLOSURE

CHIMNEY MUST BE ENCLOSED

C

L

VERTICAL CHIMNEY

ENCLOSURE

SUPPORT STRAPS

NOT TO PENETRATE

FIRESTOP

FIRESTOP SPACER 2" MIN. AIR SPACE

CLEARANCE AT JOIST. ("L" SERIES CHIMNEY)

CONTINUE CHIMNEY THROUGH ROOF AND

INSTALL ROUND CHIMNEY CAP OR 

CHIMNEY HOUSING

FIRESTOP SPACER

DIAGONAL

CHIMNEY 

ENCLOSURE

RISE

C

L

FIRESTOP 

SPACER

2" AIR SPACE

CLEARANCE TO

COMBUSTIBLES

SUPPORT STRAPS

DIAGONAL CHIMNEY

ENCLOSURE

OFFSET MAX. (10')

DIAGONAL CHIMNEY ENCLOSURE

FASTEN ALL SUPPORT

STRAPS SECURELY

VERTICAL CHIMNEY ENCLOSURE

ACCEPTABLE.

RECOMMENDED.

IS 30 FT. OR MORE

PER FIREPLACE.

NOTE: FOUR ELBOWS MAY

BE USED WHEN TOTAL

INSTALLATION HEIGHT

MAXIMUM 4 ELBOWS

LF-FS-30

CENTERLINE OF

CHIMNEY

17

7 1/4

30

˚

22 1/16

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.

HOLD 13" DIAMETER

HOLD 13" DIAMETER

(OUTSIDE PIPE)

VERTICAL

SCRIBE LINE

AT BOTTOM

* OR 2" ABOVE ANY POINT WITHIN 10'

APPLY MASTIC HERE

STORM COLLAR

FLASHING

*36"

MODEL LC

CHIMNEY CAP

18 1/2"

7 9/16

CHIMNEY OFFSET AND CAP INSTALLATION

FIGURE 20

16

53D9037. Rev 1 03/03

CHIMNEY CAP INSTALLATION

17

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 20.

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.

53D9037. Rev 1 03/03

CHIMNEY HEIGHT AND OFFSET CHARTS

18

17

26 1/2

31 3/4

36

41 1/4

47 1/4

50 3/4

57 3/4

62

67 3/4

72 1/2

77 1/2

82

88

92 1/4

98 1/2

102 3/4

107 3/4

113 1/4

118 1/4

122 1/2

128 3/4

133

139 1/4

143 1/2

148 1/2

154

159

163 1/4

169 1/2

173 3/4

180

184 1/4

189 1/4

194 3/4

199 3/4

204

210 1/4

214 1/2

220 3/4

CHIMNEY SECTIONS WITH ELBOW OFFSETS

TOTAL IN.

OFFSET

CHIMNEY SECTIONS

4 1/2

10

13

15 1/2

18 1/2

22

24

28

30 1/2

33 1/2

36 1/2

39 1/2

42

45 1/2

48

51 1/2

54

57

60

63

65 1/2

69

71 1/2

75

77 1/2

80 1/2

83 1/2

86 1/2

89

92 1/2

95

98 1/2

101

104

107

110

112 1/2

116

118 1/2

122

4'

0

1

0

1

0

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

3'

0

1

0

1

0

2

0

1

2

0

1

3

0

2

3

1

2

0

1

3

0

2

3

1

2

0

1

3

0

2

3

1

2

0

1"

0

1

0

2

1

0

2

0

1

0

1

0

0

1-1/2'

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

ELBOW

SET

1

1 

1

1 

1



INTERMEDIATE

SECTIONS 4'

0

1

0

1

0

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

4

3

5

4

3

5

4

6

5

4

6

5

4

6

5

7

6

5

7

6

5

7

6

8

3'

1

0

1

0

2

0

1

2

0

1

3

0

2

3

1

2

0

1

3

0

2

3

1

2

0

1

3

0

2

3

1

2

0

1

3

0

2

3

1

2

0

1

3

0

2

3

1

2

0

1

3

0

2

3

1

2

0

1-1/2'

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0

1

0



1'

0

2

0

1

0

1

0

1

0

0

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

305

310

317

322

329

334

340

346

352

357

364

369

376

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.

53D9037. Rev 1 03/03

CHIMNEY CAP CHASE INSTALLATION

19

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 the telecope to the 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 21

2" MIN.

MAINTAIN 2" MINIMUM AIR SPACE

CLEARANCE TO COMBUSTIBLES 

ABOVE ROOF LINE.

CHASE

1 1/2' MIN. 

OVERLAP

NOTE: Locally built chase flashings must incoperate 

a 13-1/4 min. to 13 3/4 max. x 2" high min. flanged 

hole for proper installation of the LCL Chimney Cap.

ROOF LINE

OUTER 

TELESCOPE

13" MAX. SPACE BETWEEN CHIMNEY

SECTION AND CHASE COVER.

ON LARGE CHASE TOPS IT IS RECOMMENDED THAT CROSS

ON LARGE CHASE TOPS IT IS RECOMMENDED THAT CROSS 

SUPPORTS BE USED TO PROVIDE ADDITIONAL SUPPORT 

TO ELIMINATE SAGGING OF THE FLASHING.

USING TABS PROVIDED, SECURE OUTER

TELESCOPING TO THE FLAT FLASHING.

CHASE TOP FLAT FLASHING 

DOES NOT REQUIRE VENTING

OR STANDOFF SPACERS 

AROUND PERIMETER.

LCL CHIMNEY CAP DESIGN

INCORPORATES LONGER DUCT

AND FLUE PIPE FOR CHASE

TYPE INSTALLATION.

53D9037. Rev 1 03/03

Monessen Hearth Radiant Wood Burning HWB800HB User manual

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