Vermont Casting BFC36 User Manual
BFC
Balance Flue
(Closed Combustion)
Heat-Circulating Fireplace
Homeowner’s Installation
and Operating Manual
Model:
BFC36
For use in the U.S. / Canada
Underwriter’s Laboratories
Report No. MH6018
DO NOT DISCARD THIS MANUAL: Retain for future use.
7412647 3/06 Rev. 12
BFC36 Balance 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 fire hazard and will void the warranty.
Description
The BFC36 fireplace is a solid fuel, woodburning fireplace. The BFC36 is a balanced flue (closed combustion) heat-circulating fireplace which receives outside
combustion air through the chimney system.
Precautions
CFM Corporation fireplaces and component parts have
been highly tested and will operate safely when installed in accordance with instructions provided in this
manual. Carefully read and understand all instructions
before beginning installation.
If you notice any damage to fireplace or component
parts, immediately report damage to your Vermont
Castings, Majestic Products dealer.
Only use CFM Corporation components or the warranty
will be voided and a fire hazard may be created.
CFM Corporation warranty will be voided by and CFM
Corporation disclaims any responsibility for the following actions:
• Installation of any damaged fireplace or chim
ney component;
• Modification of fireplace, chimney assembly
or any component parts thereof; (except for
chase flashings as detailed in CFM Corporation
Chimney Top installation instructions).
• Installation other than as instructed by CFM
Corporation; or
• Installation and/or use of any component part
not manufactured or approved by CFM Corporation in combination or assembly with a CFM
Corporation fireplace system, notwithstanding any independent testing laboratory or
other third party approval of such component
parts or accessory.
Any such action may possibly cause a fire hazard.
Consult local building codes to ensure that you are in
compliance before installing the fireplace.
This fireplace 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 fireplace 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 specified for use with this fireplace.
WARNING: Check with your electronics manufac-
turer before installing a television or other electronic device above this fireplace.
Proposition 65 Warning:
burning or oil fired appliances, and the products of
combustion of such fuels, contain chemicals known
to the State of California to cause cancer, birth defects and other reproductive harm.
California Health & Safety Code Sec. 25249.6
Fuels used in gas, wood-
Drafts
The fireplace should not be located in areas that create
drafts (ie: frequently opened doors and central heating
air inlets/outlets) that hamper the normal flow of air into
the fire.
Gas Logs
If you plan to install a gas log, the gas line should be
installed before framing the fireplace. The gas line must
be installed by a certified gas line installer.
BFC36
Listed
UL127 / ULC-S610
Standard for Factory Built Fireplaces
Unit: WABD3J0
Table of Contents
Safety Information ....................................2
Specifications and Framing .....................
Parts Identification ...................................
Chimney Requirements ........................... 6
Planning Information ................................ 7
Installation ...............................................8
Replacement Parts ................................. 19
Accessories ........................................... 20
3
5
2
7412647
BFC36 Balance Flue Heat-Circulating Fireplace
" (16mm)
" (13mm)
"
32"
(829mm)
41" (1064mm)
"
(16mm)
"
(49mm)
" (914mm)
"
(533mm)
" (176mm)
" (179mm)
Recessed
Nailing
Flange
13" Dia.
(343mm)
Rough Opening Width 43"
Rough
Opening
Height
Rough
Opening
Depth
Gas Line
Access
51" (1297mm)
51"
(1297mm)
" (1834mm)
"
(197mm)
23"
(584mm)
"
(610mm)
"
(624mm)
39
"
(997mm)
"
(246mm)
35"
(889mm)
"
(279mm)
Gas Line
Access
"
(902mm)
36"
(914mm)
(1092mm)
11" Dia.
(179mm)
8" Dia.
(203mm)
" (918mm)
A
B
C
BFC36 Balanced Flue Heat-Circulating Fireplace
Fig. 1 BFC36 specifications and framing.
Front Width Back Width Depth
A B C
BFC36 32¹⁄₂" 20⁷⁄₁₆" 17³⁄₄"
(826 mm) (519 mm) (451 mm)
Fig. 1a Hearth dimensions.
FP1531
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3
BFC36 Balance Flue Heat-Circulating Fireplace
Batt Insulation
(Cut out around
firestop)
Firestop
Ceiling Level
Termination Cap
Storm Collar
Pan Flashing
Draftstop
Gas Line Ac
cess Hole
(Each Side)
Top Grille and Air Outlet
-
Air Inlet
Basket Grate
Bottom Grille
Metal Safety Strip(s)
Shown not inplace
(1,2 or 3 pieces)
Standoff
Trim Ledge
Standoff
Surround
Glass Door
Romex Pigtail
Gas Line Access Knock
out (Each Side)
-
Nailing Flange
Fig. 2 Fireplace and chase parts identification.
4
FP554c
7412647
BFC36 Balance 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.
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 (first) elbow of any pair does
not have straps.
Offset
¹⁄₄" 20"
¹⁄₄" 25¹⁄₄"
¹⁄₂" 29¹⁄₄"
¹⁄₂" 34¹⁄₄"
¹⁄₄" 40³⁄₄"
³⁄₄" 43¹⁄₂"
¹⁄₄" 51¹⁄₄"
¹⁄₂" 55¹⁄₄"
¹⁄₂" 60¹⁄₄”
¹⁄₂" 65¹⁄₂"
¹⁄₂" 70³⁄₄"
¹⁄₂" 77³⁄₄"
¹⁄₄" 87¹⁄₂"
¹⁄₄" 98"
¹⁄₄" 103¹⁄₄"
¹⁄₄" 108¹⁄₂"
¹⁄₄" 113¹⁄₂"
¹⁄₂" 117¹⁄₂"
¹⁄₄" 124"
¹⁄₂" 128"
¹⁄₄" 134¹⁄₂"
¹⁄₄" 160¹⁄₄"
¹⁄₄" 170³⁄₄"
¹⁄₄" 177³⁄₄"
¹⁄₄" 181³⁄₄"
¹⁄₄" 186¹⁄₄"
¹⁄₄" 191¹⁄₂"
¹⁄₄" 196³⁄₄"
³⁄₄" 209³⁄₄"
³⁄₄" 220"
IWF282
Rise
³⁄₄"
³⁄₄"
¹⁄₄"
¹⁄₂"
³⁄₄"
¹⁄₄"
¹⁄₂"
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*.
BFC36
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 fireplace to the centerline of the
chimney where it is to pass through the
first 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 8
0 1 0 0 0 11
2 0 0 0 0 13
1 1 0 0 0 16
0 0 1 0 0 20
2 1 0 0 0 21
0 0 0 1 0 26
0 1 1 0 0 28
1 0 0 1 0 31
0 1 0 1 0 34
0 0 2 0 0 37
1 1 0 1 1 41
0 0 1 1 1 45" 83
0 1 2 0 1 47
0 0 0 2 1 51" 94"
0 1 1 1 1 53
0 0 3 0 1 56
0 1 0 2 1 59
0 0 2 1 1 62
0 1 3 0 1 64
0 0 1 2 1 68
0 1 2 1 1 70
0 0 0 3 1 74
0 1 1 2 2 78" 140
0 0 3 1 2 81" 146"
0 1 0 3 2 84" 151
0 0 2 2 2 87" 156
0 1 3 1 2 89
0 0 1 3 2 93" 166
0 1 2 2 2 95
0 0 0 4 2 99
0 1 1 3 2 101
0 0 3 2 2 104
0 1 0 4 2 107
0 0 2 3 2 110
0 1 3 2 3 114" 203
0 0 1 4 3 117
0 1 2 3 3 120" 213
0 0 0 5 3 123
1¹⁄₂'
3’ 4’
Chimney
Support
Fig. 3 Chimney system requirements.
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5
BFC36 Balance Flue Heat-Circulating Fireplace
L
1
L
1
L
T
TOTAL
LENGTH
(L
T
)
INSTALLED
LENGTH
(L
1
)
"
"
"
"
"
"
"
"
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 fireplace will be set and how the
chimney system will be run.
Mounting the Fireplace
A fireplace may only be mounted on the following surfaces:
1. A flat 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 fireplace.
The fireplace 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 fire
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.
FP288a
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 fireplace may be
used.
6. A guy wire stabilizer is required for chimneys extending more than 6’ (1.8m) above a roof line.
6
AC246
Fig. 5 Ten Foot Rule illustration.
7412647
BFC36 Balance Flue Heat-Circulating Fireplace
Chimney Supports
The chimney system is supported by the fireplace 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 fireplace.) Support provided by elbow straps fulfills
the support requirement only if they are spaced as previously described. (A chimney support is 2¹⁄₂" (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 fireplace
enclosure to eliminate cold air penetration as much
as possible.
Insulate base of fireplace with a noncombustible
insulation rated for a minimum of 300°F. Insulating
is very important for outside wall installations over
a concrete slab. If fireplace is installed on a platform,
insulation should be placed on top of the platform
before fireplace is set. (Fig. 7)
When a fireplace 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 firestop at
the first ceiling level above the fireplace and enclose
the chase with sheeting material. Insulation may
then be installed above sheeting material to assure
the space around the fireplace is totally protected.
(Fig. 2)
When installing the chimney, DO NOT caulk between outer pipe and firestop. It is vital that some air
be allowed to flow through this very thin gap.
CAUTION: When installing a fireplace 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 fireplace and/or chimney. Chases are typically built
on the outside of the house with fireplace opening cut
into the outer wall of a room. (Page 4, Fig. 2)
If you need help in determining fireplace location or how
the chimney system should be run, contact your Ver
mont Castings, Majestic Products dealer for assistance.
7412647
-
7
BFC36 Balance Flue Heat-Circulating Fireplace
Hard Flat
Surface
NOTE: Check local building codes to determine if
junction box is required at the romex pigtail/house wire
connection Also check junction box and speed control
(SCVS) installation instructions.
The Model FKSX-A blower assembly is preinstalled in
the BFC36.
Fireplace Electrical
Coverplate
Romex Pigtail
(Provided)
Wire Nuts
(Not provided)
Insulation
Platform
FPC555a
Fig. 7 Insulating between platform and fireplace.
Framing
Framing can be constructed before or after the fireplace
is set in place, however, most installers build the frame
before setting the fireplace.
Frame fireplace with 2 x 4 lumber or heavier materi
als. Refer to framing dimensions in Figure 1 for basic
fireplace specifications.
NOTE: Framing should be positioned to accommodate
wall covering and fireplace facing material.
Installing Electrical Wire
The fan requires 120VAC, 60 Hz power which may be
connected to the right side of the fireplace using the
romex pigtail provided with teh unit. This power must
be completed before the fireplace is secured and finish
material applied.
1. Attach the white wire from house power to the white
wire of the romex pigtail and secure with a wire nut.
2. Attach the black wire from the house power to the
black wire of the romex pigtail and secure with a
wire nut.
3. Attach the ground wire from house power to the
ground wire of the romex pigtail and secure with a
wire nut. (Fig. 8)
IMPORTANT: The wire nuts must be tight.
Black
White
FP1062
Fig. 8 Wiring diagram.
Ground
House
Wiring
(120V
60Hz)
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 fireplace must use CFM Corporation 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 flue, put the fireplace in
final position and measure out from the wall: 8³⁄₄" (222
mm). Mark a spot on the ceiling directly above the fireplace. Draw a line parallel to the back wall through this
mark. (Fig. 9)
Using a plumb bob positioned directly over center point
of fireplace flue collar, mark the ceiling to establish the
chimney center point. (Fig. 9)
8
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