Monessen Hearth BFC36 Operating Manual

BFC

Balanced Flue
(Closed Combustion)
Heat-Circulating Fireplace

Model:

BFC36

Homeowner’s Installation and

For use in the U.S. / Canada
Underwriter’s Laboratories
Report No. MH7603

Operating Manual

DO NOT DISCARD THIS MANUAL: Retain for future use.

7412647 5/12 Rev. 20

BFC36 Balanced Flue Heat-Circulating Fireplace

Table of Contents

Safety Information ......................................................................................3

Specications and Framing .......................................................................4

Parts Identication ....................................................................................6

Chimney Requirements ............................................................................7

Planning Information .................................................................................. 8

Installation .................................................................................................9

Replacement Parts ..................................................................................19

Accessories .............................................................................................21

Warranty...................................................................................................23

2

BFC36

Listed

UL127 / ULC-S610

Standard for Factory Built Fireplaces

7412647

BFC36 Balanced Flue Heat-Circulating Fireplace

Safety Information

Please Read This Manual Before Installing and Using Fireplace

IMPORTANT: Read all instructions and warnings carefully before starting installation. Failure to follow these instruc-

tions may result in a possible re hazard and will void the warranty.

Description

The BFC36 replace is a solid fuel, woodburning re­place. The BFC36 is a balanced ue (closed combus­tion) heat-circulating replace which receives outside
combustion air through the chimney system. This
unique system results in much higher efciency since
valuable room air is not used for combustion.

The BFC36 is a decorative replace which provides
efcient supplemental heat compared to other wood
burning replaces. It should not be used as a primary
source of heat.

CAUTION: Overloading the rebox with wood may re­sult in overring and damage to refractory components,
the grate and doors.

Consult local building codes to ensure that you are in
compliance before installing the replace.

This replace and chimney system must be vented to
the out-of-doors.

Do not obstruct or modify air inlets/outlets in any
manner.

Do not install combustible materials on any of the
black replace surround.

Burn only solid wood fuel or gas logs.
The BFC36 is intended for operation only with the

doors closed.
Do not install a solid fuel burning insert or other

products not specied for use with this replace.

Precautions

MHSC replaces and component parts have been
thoroughly tested and will operate safely when installed
in accordance with instructions provided in this manual.
Carefully read and understand all instructions before
beginning installation.

If you notice any damage to replace or component
parts, immediately report damage to your MHSC dealer.

Only use MHSC components or the warranty will be
voided and a re hazard may be created.

MHSC warranty will be voided by and MHSC disclaims
any responsibility for the following actions:

• Installation by any other than a qualied

installer, preferably NFI or WETT (Canada)
certied.

• Installation of any damaged replace or chim-

ney component;

• Modication of replace, chimney assembly

or any component parts thereof; (except for
chase ashings as detailed in MHSC Chimney
Top installation instructions).

• Installation other than as instructed by MHSC;

or

• Installation and/or use of any component part

not manufactured or approved by MHSC in
combination or assembly with a MHSC re­place system, notwithstanding any indepen­dent testing laboratory or other third party
approval of such component parts or acces­sory.

Any such action may possibly cause a re hazard.

7412647

Proposition 65 Warning: Fuels used in gas, wood­burning or oil red appliances, and the products of
combustion of such fuels, contain chemicals known
to the State of California to cause cancer, birth de­fects and other reproductive harm.

California Health & Safety Code Sec. 25249.6

WARNING: Check with your electronics manufac­turer before installing a television or other electron­ic device above this replace.

Drafts

The replace should not be located in areas that create
drafts (ie: frequently opened doors and central heating
air inlets/outlets) that hamper the normal ow of air into

the re.

Gas Logs

If you plan to install a gas log, the gas line should be
installed before framing the replace. The gas line must
be installed by a certied gas line installer.

3

BFC36 Balanced Flue Heat-Circulating Fireplace

6

" (16mm)

56O" (13mm)

56O"

326"

(829mm)

41(6" (1064mm)

6"

(16mm)

56QE"

(49mm)

" (914mm)

"

(533mm)

56QE" (176mm)

56QE" (179mm)

Recessed
Nailing
Flange

1356O" Dia.
(343mm)

Rough Opening Width 43"

Rough
Opening
Height

Rough
Opening
Depth

Gas Line
Access

5156QE" (1297mm)

5156QE"

(1297mm)



6QE

" (1834mm)

6M"

(197mm)

23"

(584mm)

"

(610mm)

6QE"

(624mm)

3956M"

(997mm)

556QE"

(246mm)

35"

(889mm)

"

(279mm)

Gas Line
Access

56O"

(902mm)

36"

(914mm)

(1092mm)

11" Dia.
(179mm)
8" Dia.
(203mm)

56

" (918mm)

A

B

C

BFC36 Balanced Flue Heat-Circulating Fireplace

Fig. 1 BFC36 specications and framing.

Fig. 1a Hearth dimensions.

Front Width Back Width Depth
A B C

BFC36 32Z\x" 20M\zn" 17C\v"
(826 mm) (519 mm) (451 mm)

FP1531

4

7412647

Batt Insulation
(Cut out around
restop)

Firestop

Ceiling Level

BFC36 Balanced Flue Heat-Circulating Fireplace

Termination Cap

Storm Collar

Pan Flashing

Draftstop

Gas Line Ac­cess Hole
(Each Side)

Top Grille and Air Outlet

Standoff

Trim Ledge
Standoff

Surround

Glass Door

Romex Pigtail

Gas Line Access Knock­out (Each Side)

Air Inlet

Basket Grate

Bottom Grille

Metal Safety Strip(s)
Shown not inplace
(1,2 or 3 pieces)

Nailing Flange

Fig. 2 Fireplace and chase parts identication.

7412647

FP554c

5

BFC36 Balanced Flue Heat-Circulating Fireplace

D

Rise

B

G

H

B

Offset

C

E

6 FT.

G

H

A

Hearth
Floor

Chimney
Section

CHIMNEY FLUE EXIT

Elbow

TCS8A
Support

Example 1 Example 2 Example 3

Offset

Rise

Chimney Requirements - Offset Installations

Notes: G + H cannot exceed 20 feet.

Air Space Clearances: = 2” Min. to Combustibles

Illustration Key

The following safety rules apply to
offset installations (letters correspond
with illustration above):

A. Height of the chimney is measured
from the hearth to the chimney exit.

BFC36
Maximum: 50’0”
Minimum:
Without Elbows 14’6”
With 2 Elbows* 14’6”
With 4 Elbows* 21’0”

B. Do not use more than 4 elbows per
chimney.

Attach the straps of the return (top)
elbow to a structural framing member.

The offset (rst) elbow of any pair does
not have straps.

Offset

IWF282

Rise

30°

Return

Elbow

30°

Offset

Elbow

30°

Return

Elbow

30°

Offset

Elbow

FP269

C. The chimney cannot be more than 30˚
(45˚ in Canada) from the vertical plane in
any installation*.

D. The maximum length of the angled run
of the total chimney system is 20 feet. (G
plus H cannot exceed 20 feet.)

E. A chimney support (Model TCS8A)
is required every 6 feet of angled run of
chimney. Chimney supports are required
for every 30 feet and 60 feet of vertical
chimney height above the hearth.

Determine the offset distance of your
chimney arrangement from the centerline
of the replace to the centerline of the
chimney where it is to pass through the
rst ceiling.

NOTE: This offset distance may not be
your full offset distance. See Examples 2
and 3.

30˚ Elbow Offsets

1’

0 0 0 0 0 3” 11”
1 0 0 0 0 8Z\v" 20"
0 1 0 0 0 11Z\v" 25Z\v"
2 0 0 0 0 13Z\x" 29Z\v"
1 1 0 0 0 16Z\x" 34Z\v"
0 0 1 0 0 20Z\v" 40C\v"
2 1 0 0 0 21C\v" 43Z\x"
0 0 0 1 0 26Z\v" 51Z\v"
0 1 1 0 0 28Z\x" 55Z\v"
1 0 0 1 0 31Z\x" 60Z\v”
0 1 0 1 0 34Z\x" 65Z\x"
0 0 2 0 0 37Z\x" 70C\v"
1 1 0 1 1 41Z\x" 77C\v"
0 0 1 1 1 45" 83C\v"
0 1 2 0 1 47Z\v" 87Z\x"
0 0 0 2 1 51" 94"
0 1 1 1 1 53Z\v" 98"
0 0 3 0 1 56Z\v" 103Z\v"
0 1 0 2 1 59Z\v" 108Z\x"
0 0 2 1 1 62Z\v" 113Z\x"
0 1 3 0 1 64Z\x" 117Z\x"
0 0 1 2 1 68Z\v" 124"
0 1 2 1 1 70Z\x" 128"
0 0 0 3 1 74Z\v" 134Z\x"
0 1 1 2 2 78" 140C\v"
0 0 3 1 2 81" 146"
0 1 0 3 2 84" 151Z\v"
0 0 2 2 2 87" 156Z\x"
0 1 3 1 2 89Z\v" 160Z\v"
0 0 1 3 2 93" 166C\v"
0 1 2 2 2 95Z\v" 170C\v"
0 0 0 4 2 99Z\v" 177C\v"
0 1 1 3 2 101Z\v" 181C\v"
0 0 3 2 2 104Z\v" 186Z\v"
0 1 0 4 2 107Z\v" 191Z\x"
0 0 2 3 2 110Z\v" 196C\v"
0 1 3 2 3 114" 203Z\v"
0 0 1 4 3 117C\v" 209C\v"
0 1 2 3 3 120" 213Z\x"
0 0 0 5 3 123C\v" 220"

1¹⁄₂'

3’ 4’

Chimney

Support

Fig. 3 Chimney system requirements.

6

7412647

BFC36 Balanced Flue Heat-Circulating Fireplace

L

1

L

1

L

T

TOTAL

LENGTH

(LT)

INSTALLED

LENGTH

(L1)

56O

"

56O

"

56O

"

56O

"

56O

"

56O

"

56O

"

56O

"

TRIPLE

WALL

81
818
83
84

2' Min.

2' Min.

3'

Min.

0 To 10'

3'

Min.

0 To 10'

Reference
Point

Planning Information

Preplanning an installation is very important to ensure
safety and to save time and money. An installer must
predetermine where a replace will be set and how the
chimney system will be run.

Mounting the Fireplace

A replace may only be mounted on the following sur­faces:

1. A at combustible surface.

2. A raised wooden platform.

3. A concrete block or other solid object placed be­neath each of the four (4) corners of the replace.

The replace must be spaced 1” (25mm) from a com­bustible back wall and 1/2” (13mm) from a combustible
side wall or support. (Page 13, Fig. 17)

Planning the Chimney Run

The Ten Foot Rule

Major U.S. building codes specify a minimum chimney
height above the roof top. The “Ten Foot Rule” is a re
safety rule and not a draft rule. To ensure proper draft,
it is recommended that you always meet or exceed the
“Ten Foot Rule,” especially when installing a termination
on a high pitch roof. (Fig. 5)

The key points of the “Ten Foot Rule” are:

1. If the horizontal distance from the chimney to the
peak of the roof is 10’ (3m) or less, the top of the
chimney must be at least 2’ (610mm) above the peak
of the roof, but never less than 3’ (914mm) in height
above the highest point where it passes through the
roof.

2. If a horizontal distance from the chimney to the peak
of the roof is more than 10’ (3m), a chimney height
reference point is established on the surface of the
roof a distance of 10’ (3m) from the chimney in a
horizontal plane. The top of the chimney must be
at least 2’ (610mm) above the reference point, but
never less than 3’ (914mm) in height above the high­est point where it passes through the roof.

Fig. 4 Installed lengths of chimney sections.

Determine how the chimney will be run, length of run
and chimney components required to complete the
job. (Fig. 4) Never install a chimney below minimum
heights.

In planning a chimney system, it is important to know:

1. The height of a chimney is measured from the
hearth to the exit point on the termination.

2. A chimney cannot be offset more than 30° from a
vertical plane.

3. A chimney may run straight up or it may be neces­sary to offset it to avoid obstructions.

4. The maximum length of an angled run (total chimney
system) is 20’ (6m).

5. No more than 2 offsets (4 total 30° elbows in U.S./or
2 total 45° elbows in Canada) per replace may be
used.

6. A guy wire stabilizer is required for chimneys extend­ing more than 6’ (1.8m) above a roof line.

7412647

FP288a

AC246

Fig. 5 Ten Foot Rule illustration.

7

BFC36 Balanced Flue Heat-Circulating Fireplace

Chimney Supports

The chimney system is supported by the replace for
vertical chimney heights less than 30’ (9m) above the
hearth. Chimney supports are required if the vertical
height exceeds 30’ (9m). Locate chimney supports
at ceiling holes or other structural framing at 30’ (9m)
heights. Spacing between chimney supports must not
exceed 30’ (9m). Use Chimney Support Model TCS8A.

(NOTE: The TCS8A cannot be mounted directly to
the replace.) Support provided by elbow straps fullls

the support requirement only if they are spaced as pre­viously described. (A chimney support is 2Z\x" (64mm)
long when installed.)

Angled chimney runs require a support every 6’ 1.8m)
in addition to the elbow straps. Chimney supports are
used for this function. (Fig. 6)

Chimney Sup­port Strap

TCS8A

Fig. 6 Chimney support installation.

FP284a

Installation

Insulating Fireplace Enclosure

for Cold Climates

If you live in a cold climate, it is not required but
highly recommended that you insulate replace
enclosure to eliminate cold air penetration as much
as possible.

Insulate base of replace with a noncombustible
insulation rated for a minimum of 300°F. Insulating
is very important for outside wall installations over
a concrete slab. If replace is installed on a platform,
insulation should be placed on top of the platform
before replace is set. (Fig. 7)

When a replace is installed in a chase or on a
outside wall, enclosure should be treated like any
outside wall in a home. Insulation should be installed
on the inside wall as well as the outside wall(s). In
a chase, it is also a good idea to install a restop at
the rst ceiling level above the replace and enclose
the chase with sheeting material. Insulation may
then be installed above sheeting material to assure
the space around the replace is totally protected.
(Fig. 2)

When installing the chimney, DO NOT caulk be­tween outer pipe and restop. It is vital that some air
be allowed to ow through this very thin gap.

CAUTION: When installing a replace in an insu­lated enclosure, be sure all required air spaces
are maintained. (Page 13, Fig. 17)

Chase Installation

A chase is a vertical box-like structure which encloses
the replace and/or chimney. Chases are typically built
on the outside of the house with replace opening cut
into the outer wall of a room. (Page 4, Fig. 2)

If you need help in determining replace location or how
the chimney system should be run, contact your MHSC
dealer for assistance.

8

7412647

Hard Flat
Surface

BFC36 Balanced Flue Heat-Circulating Fireplace

4. Using supplied junction box assembly, connect and
secure house romex wiring to duplex outlet. Ensure
correct polarity and that the ground wire is securely
connected.

5. Secure romex wiring using supplied strain relief
tting at rear of junction box. Re-assemble junction
box.

6. Secure romex wiring at strain relief tting in replace
outer wrapper.

7. Mount junction box mounting plate to inside face of
right side oor support using two self-tapping sheet
metal screws.

8. Plug blower cord into duplex outlet.

9. Replace lower grille.

Insulation

Platform

FPC555a

Fig. 7 Insulating between platform and replace.

Framing

Framing can be constructed before or after the replace
is set in place, however, most installers build the frame
before setting the replace.

Frame replace with 2 x 4 lumber or heavier materi­als. Refer to framing dimensions in Figure 1 for basic
replace specications.

NOTE: Framing should be positioned to accommodate
wall covering and replace facing material.

Electrical Wire Installation

The fan requires 120V AC, 60 Hz power which may be
connected from the right side of the replace. This pow­er connection must be completed before the replace is
secured and nish material applied.

The lower cavity of the replace may be accessed by
removing the lower grille. Lift grille and pull lower side
out to remove.

1. If using romex type power supply wiring, install a
strain relief tting into the small access hole in the
lower right side of the replace outer wrapper.

2. Route house power wires into the replace through
the tting.

3. Extend these wires through large front hole of right
side oor support.

Chimney Set-up

Since you have already preplanned the chimney run,
you should know exactly how the installation is to
be accomplished — how much pipe is required, the
number of elbows, if any, and type of termination to be
used.

CAUTION: REPORT TO YOUR DEALERS ANY
PARTS DAMAGED IN SHIPMENT, SPECIFICALLY
CHECK THE END CONNECTION OF CHIMNEY SEC­TIONS AND ELBOWS.

NOTE: The BFC36 replace must use MHSC Model
triple wall 8” chimney components only. The installation
procedure described in this manual applies only to this
system.

Straight-Up Chimney Installation

To mark the centerline of the ue, put the replace in
nal position and measure out from the wall: 8C\v" (222
mm). Mark a spot on the ceiling directly above the re­place. Draw a line parallel to the back wall through this
mark. (Fig. 8)

Using a plumb bob positioned directly over center point
of replace ue collar, mark the ceiling to establish the
chimney center point. (Fig. 8)

Offset Installation

In order to clear an obstruction, it may be necessary to
offset chimney from vertical. This is accomplished by
using elbows. Use the 30° Offset Elbow table on Page
5 to determine proper offset and parts required.

Each offset requires two (2) elbows. The second elbow
is equipped with support straps. It is very important to
install the second elbow in each offset as close to the
ceiling or support as possible so that the elbow straps
can be secured to framing members to help support the
weight of the chimney.

7412647

9

BFC36 Balanced Flue Heat-Circulating Fireplace

86M"

(222mm)

Chimney Centerline

Actual Center­point

Plumb Line

Plumb Bob

Imaginary Center­point

Cutting the Hole

Cover replace collar opening and cut proper sized
chimney hole in chimney.

Framing the Ceiling Hole

Frame the ceiling chimney hole as shown in Figure 9. It
is good practice to use framing lumber that is the same
size as the ceiling joists; this is a requirement at attic
level.

Existing
Ceiling
Joists

New
Framing
Members

Fig. 9 Typical frame for ceiling chimney hole.

The following table gives restop spacer model num­bers:

17Z\x”

(445mm)

17Z\x”

(445mm)

Ceiling

Chimney
Hole

FP551b

FPC556a

Fig. 8 Locate centerline of chimney with plumb line.

Determine offset distance of your chimney arrangement
from centerline of replace to centerline of chimney
where it is to pass through ceiling.

Locate center point of the chimney on ceiling as though
a straight up chimney arrangement is to be used. Mea­sure your offset dimension from straight up chimney
center point on ceiling.

Ceiling Chimney Hole/

Possible Obstructions

The size of the hole in ceiling will vary with the angle at
which the chimney passes through ceiling.

Drive a nail up through ceiling at marked chimney cen­ter point. Go to oor above and see where hole will be
cut. Check to see where existing ceiling joists and other
possible obstructions are located...i.e. wiring, plumbing
etc... If necessary, re-position chimney and/or replace

to avoid obstructions.

Chimney Hole Size

Angle of Chimney
at Ceiling
Size of Chimney Vertical 30°
FS2A FS6A
8” Flue 17Z\x” x 17Z\x” 17M\₈” x 29⁵\₈”
(445 x 445mm) (454 x 753mm)

Fig. 10 Ceiling chimney hole sizes necessary for installing
restop spacer.

The inside dimension of the frame must be the same
as the hole size selected from Figure 10 in order to
provide required the 2” (51mm) air space between the
outside diameter of the chimney and the edges of the

framed ceiling hole.

10

7412647

Positioning, Safety Strips,

Securing the Fireplace

Slide replace into position.

Lift the replace front slightly and slide the metal safety
strips under front bottom edge about 1Z\x” (38 mm),
allowing the remainder to extend in front of rebox.
Overlap strips at least 1/2” (13 mm) to provide a posi­tive joint. (Flat safety strips are packed with replace.)
(Fig. 11)

Safety strips are used to ensure that any combustible
materials in front of the replace are protected even
though a non-combustible hearth extension is required.

If replace is to be elevated above the oor, a “Z”
shaped metal safety strip must be fabricated and used
to protect combustible surfaces in front of the replace.
This “Z” shaped safety strip is not provided but must be
fabricated of metal with each horizontal leg at least 1Z\x”
(38mm) wide and equal in length to the metals strips
provided with the replace.

NOTE: Safety strips are not required over non-com­bustible oors where all supports at the base of the
replace are noncombustible.

Four (4) nailing anges are supplied with the replace
(found on the replace hearth). To level the box and
secure it rmly in place, remove the nailing anges from
the hearth and install at the sides of the replace as
shown in Figure 12.

BFC36 Balanced Flue Heat-Circulating Fireplace

Metal Safety Strips
(1,2 or 3 pcs.)

“Z” Safety
Strip
(not sup­plied)

Hearth Ext.

FP557b

Nail Top
Standoffs

Nail Side­Nailing
Flanges

Z\x” (13mm)

1Z\x”

(38mm)

Fig. 11 Safety strip installation.

Min. Overlap

Fire­place

Plat­form

7412647

FPC549a

Fig. 12 Fasten replace in position.

11

BFC36 Balanced Flue Heat-Circulating Fireplace

UP

Installing the

Chimney System

Start by attaching the rst chimney section to the collar
on top of the replace.

Install the pipe as pictured in Figure 13. When you
get a good lock, you will hear the pipe clearly snap
together. Once sections are snap-locked in place, it is
extremely difcult to get them apart. Make sure the

pipe is rmly snapped and locked together as each
pipe section is mounted.

When installing elbows, only outer pipe will snap­lock. Middle pipes simply slide into position. Be sure
to always attach straps on upper elbow to a structural
framing member. (Fig. 14)

Continue installing the pipe as required until pipe is
installed up through the ceiling. At this point, you must
install a restop spacer.

Installing the Firestop Spacer

in the Ceiling Hole

A restop spacer is used to keep pipe spaced properly
and required for safety.

Nail the restop spacer (at each corner) to the framing
members of the ceiling hole. NOTE: A restop spacer
is not required at the roof.

Hole sizes listed in Figure 10 for angled restop spac­ers provide minimum required air space to chimney
pipe for ceiling thickness up to 8” (203 mm). When
combined thickness of ceiling material, ceiling joists
and ooring material exceeds 8” (203 mm), adjustments
must be made in framing to assure that minimum air
spaces to chimney are maintained.

Pipe Section

Pipe
Rim

Hem

Lance

Pipe
Hem

FPC558a

Fig. 13 Install pipe, listening for the snap-lock to fasten.

Elbow Strap

Angled Strap

Support Structure

Elbow Strap
(must be tight)

Ceiling
Hole Fram­ing

Angled Firestop

Proper Firestop Spacer Installation

Figure 15 shows different installation procedures for
both an area that is an attic and an area that is not an
attic.

If the area above the ceil­ing is not an attic, position
the restop spacer with the
ange on the ceiling side
and the angled portion ex­tending up into the hole.

If the area above the ceil­ing is an attic, position the
restop spacer with the
ange on the top of the
framed hole and the angled
portion extending down into
the hole.

12

Attic Installation

NOTE: If the attic insulation shield is used, the

restop is not required in the attic installation.

Fig. 15 Installing restop spacer.

FP270/271

Fig. 14 Attach straps to a structural framing member.

Chimney Support Strap
(must be tight)

Ceiling Installation

Nails (4)

Firestop

Spacer

Firestop

Joist

Spacer

Nails (4)

FP593

Joist

7412647

BFC36 Balanced Flue Heat-Circulating Fireplace

Firestop spacers are not available for, nor are they
required on vertical walls.

DO NOT put any sealant around the area where the
outer pipe slides through the restop spacer. If you
seal this area, it may cause a re hazard.

Canadian Requirements

for Insulation Shield

In Canada, an attic insulation shield is required to
prevent attic insulation from contacting the chimney
section. NOTE: If the attic insulation shield is used, the
restop is not required in the attic installation. Fram­ing dimensions for the chimney hole should measure
17Z\x” x 17Z\x” (445 x 445mm). An attic shield MUST be
installed on top of attic joists (above the oor level).
(Fig. 16)

Attic Insula­tion Shield

Nails
(4 required)

A chimney support is 2Z\x" (64 mm) long when installed.
Consider this dimension when determining how many
straight chimney sections are needed.

NOTE: Chimney supports are generally used in long
runs in a chase installation.

Additional Ceilings

If you encounter additional ceilings, repeat same steps
required for rst ceiling installation. See restop illus­tration in Page 11, Figure 15.

Penetrating the Roof

Run pipe to rooine. Since chimney system must be
vented to the out-of-doors, you must use an approved
MHSC termination.

If a chase is used, refer to the installation manual pro­vided with the termination cap.

Locate Chimney Centerpoint On Roof

Use same procedure detailed in locating center point of
the ue system.

Drive a nail up through roof at the center point. This will
determine center point on outside of the roof.

Attic Joist

Base Flanges

Ceiling

FP263

Fig. 16 Attic shield installation (Canadian requirement).

NOTE: In the U.S., it is a good idea, although not al-

ways required, to install an attic insulation shield where
blown-in insulation is planned to be used in the attic.

Install the attic insulation shield with the anges on its
base extending down into the framing hole. Nail each
corner of attic insulation shield to the framing members
of the ceiling hole using 8d nails. Attic shields are not
required at the roof.

Continue Installing Pipe to Complete Run

Continue attaching pipe sections to complete system
to next level always being careful that the pipe is rmly
snap-locked in place before proceeding to next pipe
section.

Chimney Supports

If chimney supports are required, they are installed the
same as elbows. Nail chimney support straps to ad­jacent structural framing, as shown on Page 8, Figure

8. Bend straps as necessary and make sure they are

secure so they will support the weight of the chimney.

Cut and Frame Roof Hole

Size of roof hole varies with the type of chimney
termination installed. Refer to installation instructions
provided with MHSC chimney termination to nd correct
size of roof hole.

There must be a 1Z\x” (38 mm) air space between out­ermost portion of chimney sections and any adjacent
combustible surfaces. (Combustible surfaces include
burnable materials such as: ceiling members, joists,
ooring, combustible insulation and roof structures.)

WARNING: Do not pack required air spaces with
insulation or other materials.

Mark an outline of the roof hole around the center of the
point nail. NOTE: Hole dimensions given in the chim­ney top installation instructions are horizontal dimen­sions; therefore, the hole size must be marked on the
roof accordingly.

Cover the opening of the installed chimney so debris
cannot get into the system.

Cut and frame the hole. It is good practice to use fram­ing lumber that is the same size as the rafters. Install
the frame securely because the chimney top and ash­ing anchored to the frame must be able to withstand
heavy winds.

Install Remainder of Chimney Sections

Since you have already preplanned the height of your
termination according to the Ten Foot Rule, continue to
install pipe to the predetermined height.

7412647

13

BFC36 Balanced Flue Heat-Circulating Fireplace

FRONT VIEW

SIDE VIEW

Air Space Clearances

Check the chimney top installation instructions for
details on how high above the roof top the chimney sec­tions (all pipes) should extend.

Installing Top Housing

or Termination

Follow the installation instructions provided with the
MHSC chimney termination you have selected.

Installing Chimney in a Chase

Refer to Page 4, Figure 2 for an illustration of a typical
chase installation.

CAUTION: Treatment of restop spacers and construc­tion of chase may vary with type of building. These
instructions are not a substitute for local building codes.
You must check your local building codes to determine
specic requirements for your city or state. NOTE:
Other building materials may be required in addition to
restop spacers.

Combustible framing material MUST NOT
penetrate AIR SPACE (shaded areas).

2”

Standoff

Z\x” air space to

sides

Firestop

Finishing

CAUTION: All joints between the nished wall and the

replace surround (top/sides) must be sealed with non­combustible material to prevent cold air leakage into
the room. Only noncombustible material may be applied
to the facing of the replace surround. (Black painted
area) (Fig. 17)

Finish Wall

Finish the wall with material of your choice. Do not
install a combustible mantel shelf less than 12”
(305 mm) above the grille opening. Do not install a
mantel face plate less than 6” (159 mm) from top
of grille opening. (Fig. 20) If a combustible material is

used below a at mantel shelf, consult your local build­ing codes for minimum clearance from top of replace
opening to bottom of mantel shelf.

All joints (top, bottom and sides) where wall or deco­rative facing material meets replace surround must
be completely sealed with a noncombustible material.
(Figures 18 and 19)

NOTE: No side wall protection is required for replaces
installed at 45° to two (2) side walls (corner installation).

Wall
Shield

Only noncom­bustible material
may be applied as
facing to the black
replace surround.

Fig. 17 Minimum clearances to combustibles.

Hearth Extension

1” Air
Space to
Back

Z\x” Air
Space to
Sides

0” Clearance to
Floor

FPC559a

14

7412647

1Z\x"
Ref.

B

C

Combustible materials are
permitted within a shaded area
shown in Figure 21 titled
Minimum Wall Clearances.

*

* *

Z\x"

12"

(305mm)

Max.

12" (305mm)

Min.

1Z\x"

(38mm)

6"

(159mm)

Min.

Combustible
Mantel Shelf
and Trim

Side View

BFC36 Balanced Flue Heat-Circulating Fireplace

Finished Wall

Stud

Standoff

Noncombustible
Material

Circulating
Front

Fireplace Opening

2 x 4 Stud

Finished Wall

Fireplace
Front

Must be sealed with noncom­bustible material

Fig. 18 Mantel clearance.

* 12” from top of grille opening.

** 6” from top of grille opening.

FP531b

Face Plate

Fig. 19 Combustible mantel clearances.

7412647

MA81

15

BFC36 Balanced Flue Heat-Circulating Fireplace

Minimum Wall Clearances

WITH
Noncombustible
Surround Facing

WITHOUT
Noncombustible
Surround Facing

Minimum Hearth Extension Dimensions

(for On-Site Construction)

G

H

G

J

Seal cracks
between the
fireplace
and hearth
extension with
noncombustible
material

Safety strips
must overlap
56O" minimum

May install
noncombustible
decorative
covering
OR .018" min.
sheet metal

Fireplace
Hearth

Combustible
Floor

1/2” Min.
EH2416 or
equal “R”
value

4" MIN.

Firebox

Opening

A - Min. clearance
to combustible
perpendicular wall

B - Min. clearance
to combustible
perpendicular wall when
using noncombustible wall shield*

Side
Wall

Side
Wall

F**

C**

E

E

D

4" Brick
(Example material)

Combustible material permitted within shaded area.

*

Noncombustible wall shield requires 1" EH2416
insulation (minimum R Value = 1.85) between decorative
noncombustible rigid covering and combustible wall.
Minimum height and width is 40" x 40".

**

Dimension/degree of angle will vary depending on thickness

of noncombustible surround facing.

Shaded area
starts 1/2" from
away from edge
of unit

4"

Side Wall Protection

Adjacent combustible side walls that are within mini­mum dimensions shown in Figure 23 of the replace
opening must be protected with a specically built wall
shield as described in Figure 17.

The special wall shield design described in Figure 18 is
an alternate method of adding protection to side walls.
Rt must =1.09 minimum.

Examples of wall shield insulation:

1. Manville - CERAFORM 126, K=.27,
1/2 inches thick

2. EH2416, K = .458,
1 inch thick required.

Hearth Installation

A hearth extension is required to protect a combustible
oor in front of the replace. Refer to Figure 20 for mini­mum dimensions and mounting detail.

Note: Hearth Extension must not cover the air inlet
opening of a replace.

The hearth extension described in Figure 20 must be
a durable non-combustible material with a minimum
(total) Rt value of 1.09; refer to Figure 21 for examples.
The overall height (above a combustible oor), depth
and width must be as indicated, with the extension cen­tered to the replace opening.

The top of insulation must be covered with a non-com­bustible decorative covering or a piece of .018” mini­mum sheet metal, to protect hearth extension material.

(Fig. 20)

Secure the hearth extension to the oor to prevent
shifting, using trim molding or other similar means at
three (3) outer edges. Seal crack between the replace
hearth and hearth extension with a non-combustible

material. (Figs. 20 and 22)

Fig. 20 Combustible side wall protection and hearth extension dimensions.

16

A B C D E F G H J

BFC36 26” 12” 17° 25° 12” 8” 8” 18” 47Z\v”
660 mm 305 mm 305 mm 203 mm 203 mm 457 mm 1200 mm

FP594b

7412647

BFC36 Balanced Flue Heat-Circulating Fireplace

COMMON MATERIALS AND FACTORS

MATERIAL K*

R

MINIMUM

THICKNESS

EH2416
Micor 300

Common Brick

0.458

5.0

1.09 0.50 in.**

0.10 5.46 in.**

R Value is for 1/2 inch.
* Units of K = BTU/SQ FT/HR/˚F/IN
** Thickness of Listed Material

WARNING: Hearth extension must be installed in
accordance with Figure 22 and must not cover the
bottom front opening of the circulating model.

Alternate noncombustible materials may be used pro­viding the (total) thermal resistance (Rt value) of the al­ternate material employed is greater than or equal to R
= 1.09 Thermal resistance (R) or thermal conductivity
(K), may be obtained from manufacturer of the material.
Factors are related by the formula K = 1/R. (Fig. 21)

T = given thickness
R = thermal resistance for a given thickness (T)
K = thermal conductivity

Noncombustible material with a lower R value may
be used, provided thickness of material is sufciently
greater to maintain an equivalent (total) thermal resis-

tance (Rt).

Wall Covering

Noncombustible
Decorative Fac­ing

Seal all cracks
between replace
surround and wall
materials with non­combustible material.

Noncombus­tible Decorative
Covering

Hearth Exten­sion Insulation

FP550

Fig. 22 Sealing gaps.

Side View

2 x 4” Header

- Do not notch at
standoffs

Seal crack between
replace and hearth
extension with noncom­bustible material

Safety Strips ­Must be overlapped 1/2”
minimum

Fig. 21 Hearth extension material factors.

Example of Determining Hearth Extension
Equivalents

To determine the thickness required for any new mate­rial:

NEW K of new material (per inch) thickness
required = --------------------------------------- X of listed

thickness K of listed material (per inch) material

Example for Common Brick

T (new) = 5.0/0.458 x 0.50 in. = 5.46 in. (new required

thickness).

7412647

FP533ADD

Glass Door Operation

The BFC36 is intended for use only with the doors fully
closed. (Fig. 23)

Correct Wrong

Fig. 23 Correct door position.

KT108b

17

BFC36 Balanced Flue Heat-Circulating Fireplace

1"

Min.

1/2"

Operation

Before the rst re, the location of the upper refractory
bafe (ceiling panel) should be checked. This part oats
intentionally and may move out of place during ship­ping or installation of the replace. If the bafe is out
of place, the resulting improper air ow will cause dirty
glass and improper combustion. The bafe should be
centered side-to-side between the refractory sidewalls
and be pulled forward (toward the glass doors) until it
rests on the front sheet metal ledge.

Refer to the publication “How to Enjoy Your Woodburn­ing Fireplace” for starting and maintaining a wood re.

Note that the BFC36 does not have a damper to open
or close. This is a tremendous efciency increasing
advantage since there is no damper to potentially leave
open after a re dies down. House air will not escape
up the chimney. Note also that the doors should remain
closed at all times except when starting or reloading a
re.

Burn only seasoned rewood. Typically, only two or
three burning logs are needed to provide efcient sup­plemental heat and a bright decorative re. In general,
fresh wood should not be loaded higher than about 2/3
the height of the rebox.

Installing Line for Gas Logs

MHSC replaces are designed to accept a 1/2” (13 mm)
gas line for installation of an approved gas appliance.
(MHSC manufactures a wide variety of gas logs for use
in MHSC replaces.)

Be sure to have the appliance installed in accordance
with building codes.

Gas connection may enter from either left or right side
of the replace.

Locate appropriate gas line in the outer casing of re­place and remove insulation from gas line tube. (Fig.

24)

From inside the replace, locate the knockout on the
rebrick -- be sure you are on the appropriate or “gas
line” side of the replace. Using a at bladed screw­driver or small chisel and hammer, carefully tap around
the knockout until it loosens and falls out.

Install 1/2” (13 mm) certied gas pipe through opening.
After gas pipe installation is complete, use insulation
that was removed from gas line tube to repack space
around the pipe. Material should be inserted from
outside of the replace and packed tightly to totally seal
between the pipe and tube.

NOTE: Gas pipe should not come in contact with
any wood structures until it has reached a point at
least 1” (25 mm) away from replace side.

Hole in Outer Casing

Gas Line
Tube

Ceramic
Knockout

Hole in
Outer Cas­ing

Fig. 24 Gas line access.

Fireplace Top View

Supply
Line

Repack Insu­lation

Ceramic Knockout
(both sides)

FP560a

BTU input of a gas appliance installed in replace
should be rated less than 100,000 BTU/Hr.

Gas pipe installation is intended for connection to a
decorative gas appliance only when (1.) incorporating
an automatic shutoff device and (2.) complying with the
Standard for Decorative Gas Appliances for Installa­tion in Vented Fireplaces (ANSI Z21.60) or CSA draft
requirements for Gas-Fired Log Lighters for Woodburn­ing Fireplaces (Draft No. 4, August 1993).

Decorative gas appliance should be installed in accor­dance with the National Fuel Gas Code, ANSI Z223.1/
NFPA 54 (latest edition).

CAUTION: When using decorative gas
appliance, ue damper must be set in fully
open position. Glass doors on the replace
must also be fully opened.

WARNING: Do not operate an unvented gas
log set in this replace with the chimney
removed.

WARNING: When installing an unvented
gas log set, the model CABL or CABR 4”
adjustable hood must be used.

18

7412647

BFC36 Balanced Flue Heat-Circulating Fireplace

1

2

3

5

6

7

8

9

10

11

12

13

14

16

15

19

18

17

4

24

20

22

21

25

23

23

26

27

28

29

MHSC reserves the right to make changes in design, materials, specications, prices and discontinue colors and products at any time, without
notice.

BFC Balanced Flue Fireplace

Ref. Description BFC36

1. Top Grille - Painted 3126160

2. Bottom Grille - Painted 3126160

3. Grate Assembly 7579218

4. Left Door Assembly Complete 30004361

5. Right Door Assembly Complete 30004362

6. Rear Firebrick 2353145

7. Side Firebrick (two per replace) 2353146

8. Hearth Firebrick 2353140

9. Nailing Flange (four per replace) 2422198

10. Fiberglas Rope Gasket (Outer Collar) 7547137

11. Top Refractory 2353147

12. Front Brick Retainer 2353163

19

13. Cable Clip (For Blower Assembly) 7522241

14. Plug Button (two per replace) 7522239

15. Left Door Gasket 20013999

16. Right Door Gasket 20013998

7412647

BFC36 Balanced Flue Heat-Circulating Fireplace

BFC Balanced Flue Fireplace (continued)

Ref. Description BFC36

17. Blower Assembly - FKSX-A 20000620

18. Grate Retainer 2353179

19. Junction Box Assembly 3126161

20. Ceramic Glass Panel (two per replace) 30004352

21. Flat Gasket 3/4” Wide (two per replace) 20013997

22. Knob (two per replace) 1600657

23. Bushing (four per replace) 1201895

24. Pan Hd, PH 1/4-20 x 1 Black (two per replace) 1200907

25. Spacer (two per replace) 1600070

26. Spring Clip 30004450

27. #8-18 x 1/2” Decorative Screw 7521180

28. Hinge Spacer (two per replace) 30004360

29. BFC Door Assembly 20014006

20

7412647

BFC36 Balanced Flue Heat-Circulating Fireplace

Accessories

The following accessories for this appliance are available from your local MHSC distributor. Should you need addi­tional information beyond what your distributor can furnish, contact: MHSC, 149 Cleveland Drive, Paris, KY 40361,
Attn: Technical Services.

CAUTION: This replace and chimney assembly is a highly engineered system, and, as such, must be operat­ed only with MHSC approved components. If you use an unapproved component to make any modications,
you may create a possible re hazard and will void the MHSC warranty. In addition, such action may void the
coverage provided by the owner’s insurance.

Model NumberDescriptionAccessory

Hearth Extension Insulation Provides hearth extension oor protection EH2416
Grate for BR/BC36/42 Holds rewood in rebox RBG-BFC36
Hearth Patch Compound Patch cracks in hearth HPC-1

See your MHSC Fireplaces distributor or dealer
for nishing Marble and Mantels, available in a
wide selection of styles.

7412647

21

BFC36 Balanced Flue Heat-Circulating Fireplace

Chimney Components

Component Description Model Number
Chimney Support Used to support chimney for each of TCS8A

30’ vertical height and 6’ of angled chimney run (8” ue)
Firestop Required at each oor level and attic on FS2A (8” straight ue)

multi-story installation FS6A (8” 30° inclined ue)
Attic Insulation Shield Required in Canada FS2100HT
Traditional Top Housing Top housing of simulated brick pattern T20B

available in red, tan or white. Appropriate (single ue)
adapter is required (8CA). Flashing included. TL20B
(extra tall single ue)

Housing Extension Extends Traditional Top Housing on 202036
steep pitched roofs (single ue)

Contemporary Chase Top Used to terminate chimney at the top of a
Termination chase. Flashing is not included. TT200C
Adapter Kit (TT8CB) is required.

Chase Top Housing Used with chase terminations to prevent rain entry. FL88
(8” ue)

Contemporary Flashing 8-6-12 with 8” ue
Required for Contemporary Round Top 0 to 6/12 pitch
termination to prevent rain entry. 8-12-12 with 8” ue
(6/12 to 12/12 pitch)

Chimney Sections 8” ue
81 (1’ long)
Used to build chimney systems. 818 (1Z\x’ long)
83 (3’ long)
84 (4’ long)

Chimney Elbows Used to develop offset chimney systems.
Only 30° elbows are available. (Elbows 830A-2
packed 2 per carton - upper and lower (8” 30° ue)
elbow set.)

Round Top Termination Used to terminate chimney on the roof. RT8C
Flashing not included. (8” ue)

Extended Round Top Chase Used to terminate chimney at the top of a RT8CL
Termination chase. Adapter Kit included. Flashing not (8” ue)
included.

Adapter Kit Required to connect triple-wall chimney 8CA
with Traditional Top Housing (T20B or TL20B) (8” ue)

Adapter Kit Required to unite chimney with TT8CB
Contemporary Chase Top. (TT200C)

22

7412647

BFC36 Balanced Flue Heat-Circulating Fireplace

LIMITED WARRANTY

Factory-Build Fireplace and Components

(Except Blowers)

What is Covered and For How Long

Five-Year Coverage: For ve years from the date this replace and components are rst purchased for use, MHSC

will, at its option, repair or replace any defective part of this replace 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 replace or accessory is rst
purchased for use, MHSC will make available to you, at our factory, a free replacement for any defective part in this
replace or accessory.

Twenty-Five-Year Availability of Replacement Parts: From the eleventh through the twenty-fth year following the
date this replace or accessory is rst purchased for use, MHSC will make available at our factory replacement parts
for this replace 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 replace 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 replace 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 replace.

Also, under our ve year coverage, we do not pay the cost of removal and replacement of any portion of the structure
in which the replace is situated, made necessary by the repair, removal or re-installation of the replace.

And under our twenty-ve 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 obligations of liability
in connection with this replace 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 this 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 a replace sold and used in the United States.

For information about this warranty, contact:
MHSC

149 Cleveland Drive
Paris, Kentucky 40361

7412647

23

MHSC

149 Cleveland Drive • Paris, Kentucky 40361

www.mhsc.com