Vanguard FB36NCA, FB42NC, FB36CA, FB42C Quick start guide

Save this manual for future reference.
WARNING: If the information in this manual is not
followed exactly, a fire or explosion may result
causingpropertydamage,personalinjury,orloss
of life.
— Do not store or use gasoline or other flammable
vapors and liquids in the vicinity of this or any other
appliance.
— WHAT TO DO IF YOU SMELL GAS
• Do not try to light any appliance.
• Do not touch any electrical switch; do not use any
phone in your building.
• Immediately call your gas supplier from a
neighbor’s phone. Follow the gas supplier’s in-
structions.
• If you cannot reach your gas supplier, call the fire
department.
— Installation and service must be performed by a
qualified installer, service agency, or the gas
supplier.
WARNING: Improper installa-
tion, adjustment, alteration,
service, or maintenance can
cause injury or property dam-
age. Refer to this manual for
correctinstallationandopera-
tional procedures. For assis-
tance or additional informa-
tion consult a qualified in-
staller, service agency, or the
gas supplier.
WARNING: For use only with
decorative type unvented room
heaters.Donotbuildawoodfire.
This firebox may be installed in an aftermarket* manufactured (mobile) home, where not prohibited by
state or local codes.
* Aftermarket: Completion of sale, not for purpose of resale, from the manufacturer (i.e. Installation of this product is permit-
ted after the manufactured (mobile) home is sited).
UNVENTED (VENT-FREE)
LogMate
®
UNIVERSAL FIREBOX
®
OWNER’S OPERATION AND INSTALLATION MANUAL
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FB36NCA, NLFB36NC, and FB42NC
Non-circulating Models
FB36CB, NLFB36C, and FB42CA
Circulating Models
®
Thisfireboxhasbeentestedand
approved by I.A.S. under their
REQ. 2-97 for use with any ANS
Z21.11.2 approved gas logs.
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2
105605
UNVENTED (VENT-FREE) LOGMATE
®
FIREBOX
VANGUARD
1. This firebox shall not be installed in a
bedroom or bathroom.
2. Never install the firebox
• in a recreational vehicle
• wherecurtains,furniture, clothing, or
other flammable objects are less
than 42 inches from the front, top, or
sides of the firebox
• in high traffic areas
• in windy or drafty areas
SAFETY
INFORMATION
IMPORTANT: Read this owner’s
manual carefully and completely
before trying to assemble, oper-
ate, or service this firebox. Im-
properuseofthisfireboxcancause
seriousinjuryordeathfromburns,
fire,explosion,electricalshock,or
carbon monoxide poisoning.
CAUTION: Carefully review
theinstructionssuppliedwiththe
decorative type unvented room
heater for the minimum fireplace
size requirement. Do not install
the appliance in this firebox un-
less this firebox meets the mini-
mumdimensionsrequiredforthe
installation.
WARNINGS
WARNING: Any change to
thisfireboxoritscontrolscanbe
dangerous.
3. Do not use this firebox as a wood-burn-
ing fireplace. Use only decorative
unvented room heaters (log sets).
4. Do not add extra logs or ornaments
suchaspinecones, vermiculite,orrock
wool. Using these added items can
cause sooting.
5. You must operate thisfireplacewiththe
provided fireplace screen, hood, and
brick liner in place. Make sure these
partsarein place andscreensare closed
before running firebox. The supplied
hood may not be replaced with a hood
which may be provided with a log
heater.
6. Do not allow fans to blow directly into
the firebox. Avoid any drafts that alter
burner flame patterns. Ceiling fans can
create drafts that alter burner flame
patterns. Altered burner patterns can
cause sooting.
7. Do not use a blower insert, heat ex-
changer insert or other accessory not
approved for use with this heater. Do
not use blower accessory with Models
FB36NCA, NLFB36NC, or FB42NC.
Use only the provided hood, or appro-
priate polished brass hood accessory.
See Accessories on page 15.
8. Vent-free gas log heaters installed in
these fireboxes require fresh air venti-
lation to run properly. See Air for Com-
bustion and Ventilation, pages 5
through 7.
9. Do not run firebox
• where flammable liquids or vapors
are used or stored
• under dusty conditions
10. Do not use this firebox to cook food or
burn paper or other objects.
11. Never place any objects in the firebox
or on logs.
12. Firebox front and screen becomes very
hot when running firebox. Keep chil-
dren and adults away from hot surfaces
toavoidburns orclothingignition. Fire-
box will remain hot for a time after
shut-down. Allow surfaces to cool be-
fore touching.
13. Carefully supervise young children
when they are in the room with firebox.
14. Turn firebox off and let cool before ser-
vicing. Only a qualified service person
should service and repair firebox.
15. Operating firebox above elevations of
4,500 feet could cause pilot outage.
16. Do not use the firebox if it has been
underwaterdueto theshock hazardthat
could result with the blower accessary
(if installed) in place.

3
105605
OWNER’S MANUAL
LOCAL CODES
Installandusefireplacewithcare.Followall
localcodes.Intheabsenceoflocalcodes,use
the latest edition of The National Fuel Gas
CodeANSZ223.1,alsoknownasNFPA54*.
Firebox must be electrically grounded in
accordancewiththeNationalElectricalCode,
ANS/NFPA70 (latest edition).
*Available from:
American National Standards Institute, Inc.
1430 Broadway
New York, NY 10018
National Fire Protection Association, Inc.
Batterymarch Park
Quincy, MA 02269
UNPACKING
1. Use utility knife to cut carton all the
way around above the staples on the
bottom tray. Lift carton off the firebox
and discard.
2. Remove all protective packaging from
inside firebox. Carefully lift the fire-
box off the bottom corrugated tray.
3. Check carton contents for the
following:
• Screen assembly
• Screen support rod
• Hardware and parts bag containing
the following:
- Owner’s Operation and Installa-
tion Manual
- 2 - Black #10 x 3/8" Phillips
screws for mounting screen sup-
port rods
If any items are missing, inform dealer
where you bought firebox.
4. Check all items for any shipping dam-
age. If damaged, promptly inform
dealer where you bought firebox.
Notice: Thefireboxidentification
label (including model number,
serial number, clearances, etc.)
is located either on the left front
edgeofthe firebox or behind the
left side firebrick panel. See Fig-
ure 18, page 12.
PRODUCT
FEATURES
OPERATION
This firebox is designed for use with ap-
proved ANS Z21.11.2 decorative type
unvented room heaters. (Physical size limi-
tations apply. Refer to minimum firebox
requirements supplied with log heater.) It
requiresnooutsideventingorchimney mak-
ing installation easy and inexpensive. When
used without the blower (models FB36CB,
NLFB36C or FB42CA only), the firebox
requires no electricity making it ideal for
emergency back-up heat.
BLOWER ACCESSORY
The FB36NCA, NLFB36C, or FB42CA
fireboxes will accept the GA3700 acces-
sory. The variable blower allows you to
select the fan speed you desire. The blower
circulates heated air from the firebox into
the room. Use of blower is optional.
BRICK LINER
Your firebox may feature a concrete brick
liner. As with all concrete liners, this liner
may develop slight cracks when exposed to
heat.Thesecrackswillnotaffecttheperfor-
manceof thefireplaceorvent-freegaslogs.
LOCATING
FIREBOX
PLANNING
Planwhere youwill installthe firebox.This
will save time and money later when you
install the firebox. Before installation, con-
sider the following:
1. Where the firebox will be located. Al-
low for wall and ceiling clearances (see
InstallationClearances, pages8and 9).
2. Everything needed to complete instal-
lation.
3. These modelsCANNOTbeinstalled in
a bedroom or bathroom.
4. Proper air for combustion and ventila-
tion (page 5).

4
105605
UNVENTED (VENT-FREE) LOGMATE
®
FIREBOX
VANGUARD
PRODUCT
SPECIFICATIONS
Figure 1 - Firebox Front View
Figure 2 - Firebox Side View
41 11/16" (36" models) • 47 11/16" (42" models)
36" (36" models) • 42" (42" models)
15 7/8"
35"
2 5/8"
2 5/8"
6 5/8"
19 3/8"
Built-in Nailing
Flanges
Standoffs
Louvers
(Models FB36CB,
NLFB36C, and
FB42CA only)
6 7/8"
1 1/2"
Diameter Holes 9 5/8"
8 7/16"
2 3/4" 1 1/2"
10 3/4"
13 9/16"
3 1/2"
Standoffs
Electrical Access Hole
Strain relief fitting for electrical cable when hard
wiring firebox for built-in installations (strain relief
fitting included on circulating models only)
Gas Line Access
Hole (either side)
Electrical Access
Hole (for use
when using
blower power
cord with external
electrical outlet.
See Blower Kit
Instructions)
30 3/8" (36" Models) • 36 7/8" (42" Models)
42 3/8" (36" Models) • 48 3/8" (42" Models)
*Interior Dimensions Within Brick Liner
(NLFB36C and NLFB36NC Models
Will Differ Slighty)
36" (36" Models) • 42" (42" Models)
41" (36" Models) • 47" (42" Models)
34" (36" Models) • 40" (42" Models)*
29 1/8" (36" Models) • 35 1/8" (42" Models)
22 3/4" (36" Models) •
28 3/4" (42" Models)*
19 1/2"
14 1/4"
22 1/4"
5/8"
Figure 3 - Firebox Top View

5
105605
OWNER’S MANUAL
PROVIDING ADEQUATE
VENTILATION
The following are excerpts from National
Fuel Gas Code. NFPA 54/ANS Z223.1, Sec-
tion5.3,AirforCombustionandVentilation.
Allspacesinhomesfallintooneofthethree
following ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 5 through 7 will
help you classify your space and provide
adequate ventilation.
Unusually Tight Construction
The air that leaks around doors and win-
dows may provide enough fresh air for
combustion and ventilation. However, in
buildings of unusually tight construction,
you must provide additional fresh air.
Unusually tight construction is de-
fined as construction where:
a. walls and ceilings exposed to the
outside atmosphere have a con-
tinuous water vapor retarder with
a rating of one perm (6 x 10-11 kg
per pa-sec-m2) or less with open-
ings gasketed or sealed and
b. weather stripping has been
added on openable windows and
doors and
c. caulking or sealants are applied
to areas such as joints around
window and door frames, be-
tween sole plates and floors,be-
tween wall-ceiling joints, be-
tween wall panels, at penetra-
tionsforplumbing,electrical,and
gas lines, and at other openings.
If your home meets all of the three
criteria above, you must provide ad-
ditional fresh air. See Ventilation Air
From Outdoors , page 7.
If your home does not meet all of the
three criteria above, proceed to Deter-
mining Fresh-Air Flow for Firebox
Location, page 6.
Today’s homes are built more energy effi-
cient than ever. New materials, increased
insulation, and new construction methods
helpreduceheatlossinhomes.Homeowners
weatherstrip andcaulk aroundwindows and
doorstokeepthecoldairoutandthewarmair
in. During heating months, home owners
want their homes as airtight as possible.
While it is good to make your home energy
efficient,yourhomeneedstobreathe.Fresh
air must enter your home. All fuel-burning
appliances need fresh air for proper com-
bustion and ventilation.
Exhaustfans,fireboxes,clothes dryers, and
fuel burning appliances draw air from the
house to operate. You must provide ad-
equate fresh air for these appliances. This
will insure proper venting of vented fuel-
burning appliances.
AIR FOR
COMBUSTION AND
VENTILATION
WARNING: This firebox shall
notbeinstalledinaconfinedspace
or unusually tight construction
unless provisions are provided
foradequatecombustionandven-
tilation air. Read the following in-
structions to insure proper fresh
air for this and other fuel-burning
appliances in your home.
Confined and Unconfined Space
The National Fuel Gas Code (ANS Z223.1,
1992 Section 5.3) defines a confined space
as a space whose volume is less than 50
cubicfeetper1,000Btuperhour(4.8m3per
kw) of the aggregate input rating of all
appliances installed in that space and an
unconfined space as a space whose volume
is not less than 50 cubic feet per 1,000 Btu
per hour (4.8 m3per kw) of the aggregate
inputratingofallappliancesinstalledinthat
space.Rooms communicatingdirectlywith
the space in which the appliances are in-
stalled*, through openings not furnished
with doors, are considered a part of the
unconfined space.
This heater shall not be installed in a con-
fined space or unusually tight construction
unlessprovisionsare providedforadequate
combustion and ventilation air.
*Adjoiningroomsarecommunicatingonly
iftherearedoorlesspassagewaysorventila-
tion grills between them.
Continued

6
105605
UNVENTED (VENT-FREE) LOGMATE
®
FIREBOX
VANGUARD
Example:
Gas water heater 40,000 Btu/Hr
Vent-free firebox
with log heater +39,000 Btu/Hr
Total =79,000 Btu/Hr
DETERMINING FRESH-AIR FLOW FOR FIREBOX LOCATION
Determining if You Have a Confined or Unconfined Space
Use this work sheet to determine if you have a confined or unconfined space.
Space: Includes the room in which you will install firebox plus any adjoining rooms with doorless passageways or ventilation grills
between the rooms.
1. Determine the volume of the space (length x width x height).
Length x Width x Height = ________cu. ft. (volume of space)
Example: Space size 22 ft. (length) x 18 ft. (width) x 8 ft. (ceiling height) = 3168 cu. ft. (volume of space)
If additional ventilation to adjoining room is supplied with grills or openings, add the volume of these rooms to the total volume of
the space.
2. Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space can support.
_____________ (volume of space) ÷50 cu. ft. = (Maximum Btu/Hr the space can support)
Example: 3168 cu. ft. (volume of space) ÷50 cu. ft. = 63.3 or 63,300 (maximum Btu/Hr the space can support)
3. Add the Btu/Hr of all fuel burning appliances in the space.
Vent-free firebox _______________ Btu/Hr
Gas water heater* _______________ Btu/Hr
Gas furnace _______________ Btu/Hr
Vented gas heater _______________ Btu/Hr
Gas firebox logs _______________ Btu/Hr
Other gas appliances* + ______________ Btu/Hr
Total =______________ Btu/Hr
* Do not include direct-vent gas appliances. Direct-vent draws combustion air from the outdoors and vents to the outdoors.
4. Compare the maximum Btu/Hr the space can support with the actual amount of Btu/Hr used.
______________ Btu/Hr (maximum the space can support)
______________ Btu/Hr (actual amount of Btu/Hr used)
Example: 63,300 Btu/Hr (maximum the space can support)
79,000 Btu/Hr (actual amount of Btu/Hr used)
ThespaceintheaboveexampleisaconfinedspacebecausetheactualBtu/HrusedismorethanthemaximumBtu/Hrthespacecansupport.
You must provide additional fresh air. Your options are as follows:
A. Rework work sheet, adding the space of an adjoining room. If the extra space provides an unconfined space, remove door to adjoin-
ing room or add ventilation grills between rooms. See Ventilation Air from Inside Building, page 7.
B. Vent room directly to the outdoors. See Ventilation Air from Outdoors, page 7.
C. Install a lower Btu/Hr firebox, if lower Btu/Hr size makes room unconfined.
If the actual Btu/Hr used is less than the maximum Btu/Hr the space can support, the space is an unconfined space. You will need no
additional fresh air ventilation.
AIR FOR
COMBUSTION AND
VENTILATION
Continued
WARNING: If the area in which the firebox and gas log heater may be operated is smaller than that defined as
an unconfined space or if the building is of unusually tight construction, provide adequate combustion and
ventilation air by one of the methods described in the National Fuel Gas Code, ANS Z223.1, 1992, Section 5.3 or
applicable local codes.

7
105605
OWNER’S MANUAL
AIR FOR
COMBUSTION AND
VENTILATION
Continued
VENTILATION AIR
Ventilation Air From Inside
Building
Thisfreshairwouldcomefromanadjoining
unconfined space. When ventilating to an
adjoining unconfined space, you must pro-
vide two permanent openings: one within
12" of the ceiling and one within 12" of the
floor on the wall connecting the two spaces
(seeoptions1and2,Figure4).Youcanalso
remove door into adjoining room (see op-
tion 3, Figure 4). Follow the National Fuel
Gas Code NFPA 54/ANS Z223.1, Section
5.3, Air for Combustion and Ventilation for
required size of ventilation grills or ducts.
Figure 5 - Ventilation Air from Outdoors
Ventilation Air From Outdoors
Provide extra fresh air by using ventilation
grills or ducts. You must provide two per-
manent openings: one within 12" of the
ceiling and one within 12" of the floor.
Connecttheseitemsdirectlytotheoutdoors
orspacesopentotheoutdoors.Thesespaces
include attics and crawl spaces.
IMPORTANT: Donotprovideopenings for
inlet or outlet air into attic if attic has a
thermostat-controlledpowervent.Heatedair
enteringtheatticwillactivatethepowervent.
Figure 4 - Ventilation Air from Inside Building
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,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
,,,,
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Or
Remove
Door into
Adjoining
Room,
Option
3
Ventilation Grills
Into Adjoining Room,
Option 2
Ventilation
Grills
Into Adjoining
Room,
Option 1
12"
12"
Outlet
Air Ventilated
Attic
Outlet
Air
Inlet
Air
Inlet Air Ventilated
Crawl Space
To
Crawl
Space
To Attic
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WARNING: Rework work-
sheet, adding the space of the
adjoiningunconfinedspace.The
combined spaces must have
enough fresh air to supply all
appliances in both spaces.

8
105605
UNVENTED (VENT-FREE) LOGMATE
®
FIREBOX
VANGUARD
INSTALLATION
CLEARANCES
WARNING:Maintainthemini-
mum clearances. If you can, pro-
vide greater clearances from
floor, ceiling, and adjoining wall.
Carefullyfollowtheinstructionsbelow.This
will ensure safe installation.
Minimum Wall and Ceiling
Clearances (see Figure 6)
A. Clearances from the side of the firebox
openingtoanycombustible wallshould
not be less than 16 inches.
B. Clearances from the top of the firebox
openingtothe ceilingshouldnot be less
than 42 inches.
INSTALLATION
CAUTION: Log heaters in-
stalledinthisfireboxcreatewarm
aircurrents.Thesecurrentsmove
heat to wall surfaces next to fire-
box. Installing firebox next to vi-
nyl or cloth wall coverings or
operating firebox where impuri-
ties(suchastobaccosmoke,aro-
matic candles, cleaning fluids,
oilorkerosene lamps,etc.)inthe
air exist, may discolor walls.
IMPORTANT: Vent-free gas log heaters
add moisture to the air. Although this is
beneficial, installingfireboxinroomswith-
out enough ventilation air may cause mil-
dew to form from too much moisture. See
AirforCombustionandVentilation,pages5
through 7.
IMPORTANT: Make sure the firebox is
level. If firebox is not level, log set will not
work properly.
Note: YourVanguardfireboxisdesignedto
beusedinzeroclearanceinstallations.Wall
or framing material can be placed against
any exterior surface on the rear, sides or top
ofyourfirebox,exceptwherestand-offspac-
ersareintegrallyattached.Ifstand-offspac-
ers are attached to your firebox, these spac-
ers can be placed directly against wall or
framing materials. Use the dimensions
shown for rough opening to create the easi-
est installation.
Use dimensions shown for rough openings
tocreatetheeasiestinstallation(seeBuilt-In
Firebox Installation, page 9).
CAUTION: Do not install the
fireboxdirectlyoncarpetorvinyl.
NOTICE: A qualified service per-
son must install firebox. Follow
all local codes.
WARNING: Never install the
firebox
• in a bedroom or bathroom
• in a recreational vehicle
• where curtains, furniture,
clothing, or other flammable
objectsarelessthan42inches
from the front, top, or sides of
the firebox
• in high traffic areas
• in windy or drafty areas
,,,,,,,
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,,,,,,,
42" to Ceiling
0" to Floor
16"
to Side Wall 16" to Side Wall
Figure 6 - Minimum Clearance to Wall, Ceiling, and Floor
C. When the firebox is installed on car-
peting or other combustible material,
other than wood flooring, the firebox
should be installed on a metal or wood
panel extending the full width and
depth of the enclosure.
D. Clearances from the bottom of firebox
to the floor is 0 inches.
These fireboxes can be installed as free-
standing units against a wall with the ap-
proved, optional cabinet mantels (see Ac-
cessories, page 15) or as a built-in unit. The
clearances are the same for either installa-
tion method.

9
105605
OWNER’S MANUAL
1. Frame in rough opening. The firebox
framing should be constructed of 2 x 4
lumber or heavier. Use dimensions in
Table 1 and rough opening layout in
Figure 8a. Adjust framing so that fire-
box flushes with finished wall surface.
If installing in a corner, use dimensions
in Figures 8b and 8c for rough opening.
2. Install gas piping to firebox location.
SeeInstalling Gas Line on page 11 and
Connecting to Gas Supply in log set
owner’s manual.
IMPORTANT: If installing blower acces-
sory (Models FB36CB and FB42CA), see
Hard-Wiring Firebox, page 12.
Figure 8 - Rough Opening for Installing in Wall
BUILT-IN FIREBOX
INSTALLATION
Built-in installation of this firebox involves
installing firebox into a framed-in enclo-
sure. This makes the front of firebox flush
with wall. Optional brass trim accessories
areavailable(seeAccessories,page15).The
brass trim will extend past sides of firebox
approximately 1/2 inch. This will cover the
roughedgesofthewallopening.Ifinstalling
amantelabovethefirebox, youmustfollow
theclearancesshowninFigure7.Followthe
instructions below to install the firebox in
this manner.
FRONT WIDTH DEPTH
MODEL # (Inside to Inside) HEIGHT (Minimum)
FB36NCA 411/4" 37" 20"
FB36CB 41 1/4" 37" 20"
NLFB36NC 41 1/4" 37" 20"
NLFB36C 41 1/4" 37" 20"
FB42NC 47 1/4" 37" 20"
FB42CA 47 1/4" 37" 20"
ROUGH OPENING DIMENSIONS FOR BUILT-IN INSTALLATION
Depth
(Minimum)
Width
(Inside to Inside)
Height
TABLE 1
Figure 8a
36"
41-1/4"
50-29/32"
72"
45°
TOP VIEW
FOR 36" MODE
L
Height - 37" for
F
35 1/2"
f
55-5/32"
78"
39"
47-1/4" 45°
TOP VIEW
FOR 42" MODELS
Height - 37" for FB
4
35 1/2" for
Figure 8b
Figure 8c
INSTALLATION
Continued
Mantel Clearances for Built-In
Installation
If placing custom mantel above built-in
firebox,youmustmeettheminimumallow-
ableclearancebetweenmantelshelfandtop
offireboxopeningshowninFigure7.These
are the minimum allowable mantel clear-
ancesforasafeinstallation.Uselargerclear-
ances wherever possible to minimize the
heating of objects and materials placed on
the mantel.
Figure 7 - Minimum Mantel Clearances for Built-In Installation
CAUTION: Do not allow the
vent-freegaslogheatertotouch
or extend beyond the fireplace
screen.
If your installation does not meet the above
minimumclearancesinFigure7, youmust:
• raise the mantel to an acceptable height,
OR
• remove the mantel.
Continued
FOR 42" MODELS
Height - 37" for FB36NC
35 1/2" for FB36CA
Supplied Firebox
Hood Must Be
Used at All Times
Wire-mesh
Screen
Firebox
Noncombustible
Material May
Project Off this
Surface above
the Firebox Hood
Mantel Shelf
13" 16" 19" 21"
2
1/2
"
6"
8"
10"
,
,
,
Note: All vertical
measurements are
from top of fireplace
hood opening to bottom
of mantel shelf.
These minimum
clearances replace any
other recommended
clearances supplied with
your ANS Z21.11.2
approved gas logs.
Wall board or facing
material (above
firebox) may be of
combustible material,
including decorative
mantel ornaments or
other similar projec-
tions off of the facing
material.
Framing
Material
FOR 36" MODELS
Height - 37" for FB36NCA
and NLFB36NC
35 1/2" for FB36CB
and NLFB36C

10
105605
UNVENTED (VENT-FREE) LOGMATE
®
FIREBOX
VANGUARD
INSTALLATION
Continued
3. Carefully set firebox in front of rough
openingwithbackoffireboxinside wall
opening. IMPORTANT: If installing
Brass Trim Kit GA6091 or GA6092,
seeinstructionsincludedwithbrass trim
accessory. You must install shoulder
screws from brass trim kit now.
4. Carefully insert firebox into rough
opening.
5. Attach firebox to wall studs using nails
or wood screws through holes in nail-
ing flange (see Figure 9).
6. If using optional GA6091 or GA6092
Brass Trim Kit, install the trim after fi-
nal finishing and/or painting of wall.
See instructions included with brass
trim accessory for attaching brass trim.
7. Install and properly test gas log heater.
Follow installation instructions in-
cluded with the vent-free gas log heater
that is being installed.
IMPORTANT: When finishing your fire-
box, combustible materials such as wall
board, gypsum board, sheet rock, drywall,
plywood, etc. may be butted up next to the
sides and top of the firebox. Combustible
materials should never overlap the firebox
front facing.
Figure9-AttachingFireboxtoWallStuds
WARNING: Do not allow any
combustible materials to overlap
the firebox front facing.
IMPORTANT: Noncombustible materials
suchasbrick,tile,etc.mayoverlapthefront
facing, but should never cover any neces-
sary openings like louvered slots.
WARNING: Do not allow
noncombustible materials to
cover any necessary openings
like louvered slots.
WARNING:Useonlynoncom-
bustible mortar or adhesives
when overlapping the front fac-
ing with noncombustible facing
material.
WARNING: Never modify or
cover the louvered slots on the
front of the firebox except when
using approved Vanguard brass
accent trim (see Accessories ,
page 18).
This firebox may be installed using a cabi-
net mantel accessory against a wall in your
home. The firebox and cabinet mantel can
be installed directly on the floor. A brass
trim kit is included with the mantel acces-
sory GM103U or GM105U (see Accesso-
ries, page 15).
1. Assemble cabinetmantelaccessory and
the brass trim kit. Assembly instruc-
tions are included with each accessory.
2. If using an optional GA3700 Blower
(circulating models only), install a
properly grounded, 120 volt three-
prong electrical outlet at firebox loca-
tion if an outlet is not there. If possible,
locate outlet so cabinet mantel will
coverit when installed (see Figure 10).
3. Install gas piping to firebox location.
See Installing Gas Line, page 11. You
may have to cut an access hole in the
floor or wall to run gas line to firebox.
Makesureto locateaccesshole so cabi-
net mantel will cover it when installed
(see Figure 10).
Figure 10 - Installing Cabinet Mantel
NOTICE: A qualified service per-
son must install firebox. Follow
all local codes.
4. Place cabinetmantelon floor in desired
location. Make sure mantel is flush
against wall.
5. Break off nailing flanges with hammer
or pliers (see Figure 11).
INSTALLING FIREBOX
USING OPTIONAL
ACCESSORY MANTELS
Cabinet
Mantel
Gas Line
Access Hole
(Either Side
of Firebox)
Gas
Piping
Electrical
Outlet
Figure 11 - Location of Nailing Flanges
(Two on Each Side)
Nailing Flanges
Nailing
Flanges
Nails or
Wood
Screws

11
105605
OWNER’S MANUAL
INSTALLING OPTIONAL
BLOWER ACCESSORY
NOTICE:Ifalogset isinstalledin
the firebox, disconnect log set
fromgassupplyandremovefrom
firebox. Contact a qualified ser-
vice person to do this.
1. If your firebox has a concrete firebrick
liner, remove liner (see Hard-Wiring
Firebox, page 12, steps 1 through 3).
2. Remove the firebox bottom.
a. Remove the 4 screws that secure the
bottomofthe firebox(see Figure 15).
b. Carefully raise and remove the fire-
box bottom from the firebox.
WARNING: If there is a duplex
electricaloutletinstalledintheright
side of the bottom of the fireplace
base area, be sure that the electri-
calpowertotheoutletisturnedoff
before proceeding with blower in-
stallation. Failure to do this may
result in serious injury.
Figure 14 - Location of Knockout for Gas
Line
INSTALLING GAS LINE
NOTICE: A qualified service per-
son must connect heater to gas
supply. Follow all local codes.
IMPORTANT: SeeConnectingtoGasSup-
plyinyourlogsetowner’smanualfordetails
on gas hookup.
Youmayrunthegas linefrom eithersideof
the firebox (see Figure 13). Decide which
side you want to run the gas line from.
Note: Thisisoneoptionforinstallingshutoff
valve. Check local codes for shutoff valve
location requirements.
Figure13-InstallingGasLineandManual
Shutoff Valve
CAUTION: Do not use exces-
sive force to remove the knock-
out. Too much force may dam-
age the firebrick concrete insert.
6. Install the brass trim kit furnished with
mantel. See instruction sheet included
with the mantel now.
7. If installing the optional GA3700
Blower (circulating models only), see
Installing Optional Blower Accessory,
column 3.
8. Carefully insert firebox into cabinet
mantel. Be careful not to scratch fire-
box,cabinetmantel, flooring, etc.when
installing (see Figure 12).
9. Install and properly test gas log heater.
Follow installation instructions in-
cluded with the vent-free gas log heater
that is being installed.
INSTALLATION
Continued
Figure12 -Inserting FireboxIntoCabinet
Mantel
Knockout Locations
(Knock Out One Hole)
Gas Line Hole
Manual
Shutoff
Valves
(Install
One)
Locate the recessed knockout in one of the
firebricksidewall liners(seeFigures13and
14). Firmly tap the center of the knockout
with a chisel until it is released. Carefully
chisel the rough edges of the hole you have
madetosmoothedges.Thisholewilllineup
with the hole in the outer casing.
,
3/4" Thick Liner
Knockout
Chisel
Firebrick Side
Wall
Remove
this Area
Side
View
Continued
Screws
Finger
Holes
Firebox
Bottom
Screws
Figure 15 - Removing Firebox Bottom

12
105605
UNVENTED (VENT-FREE) LOGMATE
®
FIREBOX
VANGUARD
2. Remove the screw and retainer bracket
at the top of the brick liner panel in the
backofthefirebox.Donot let the panel
fall after the bracket is removed. Care-
fully remove the rear firebrick liner
panel from the firebox.
INSTALLATION
Continued
Figure19-RemovingRearFirebrickLiner
Panel
CAUTION: Do not let the fire-
brick liner panel fall after the
bracket is removed.
3. Carefully lift and remove the bottom
firebrick floor from bottom of firebox.
4. Removethe fourPhillipsscrewsinfire-
box bottom.
Figure 20 - Removing Bottom Firebrick
Floor
Screw
Rear Firebrick
Liner Panel
Bracket
Figure 17 - Installing Plastic Bushing for
Power Cord
1 1/2" Hole
Plastic
Bushing
Plastic
Hole Plug
Figure 16 - Mounting Blower to Firebox
Blower
Screws
Lower Rear Wall of
Firebox Wrapper
Top
Mounting
Tab
Exhaust Port
3. Place the blower against the lower rear
wall of the firebox outer wrapper with
theexhaustport directedupward.Align
theholesin topmountingtabs ofblower
with holes in wall of wrapper (see Fig-
ure16). Using2screwsprovided,mount
blower and tighten screws securely.
4. Be certain that all wire terminals are
securely attached to terminals on
blower motor and that the screw retain-
ing the green ground wire is tight.
5. Locate the plastic hole plug installed
in the 3/8" diameter opening in the
lower right side of the firebox front
panel (see Figure 17). Remove the
plastic plug and discard.
HARD-WIRING FIREBOX
For Built-in Installation of
Circulating Models Only
NOTICE: A qualified electrician
must connect electrical wiring
to duplex outlet for built-in in-
stallation. Follow all local
codes.Inabsenceoflocalcodes
follow The National Electric
Code ANS/NFPA 70.
ModelsFB36CB,NLFB36C, andFB42CA
can be hard-wired to the duplex outlet lo-
cated inside the firebox bottom if desired.
Thisallowsthe GA3700BlowerAccessory
to be plugged into the duplex outlet.
1. If your firebox has a brick liner use a
Phillips screwdriver, remove the screw
and retainer bracket at the top of the
firebrick liner panel on the left side.
Carefully remove the left panel from
the firebox. Repeat for firebrick liner
panel on right side.
Figure 18 - Removing Side Panel
Retainer
Bracket
Left Side Firebrick Liner Panel
Screw
Product
Identification
Label

13
105605
OWNER’S MANUAL
INSTALLATION
Continued
Screws
Finger
Holes
Firebox
Bottom
Screws
Figure 21 - Removing Firebox Bottom
Screw
Duplex
Outlet
Support
Bracket
Electric
Cables
Figure 22 - Removing Duplex Outlet
5. Use the two finger holes in the firebox
bottom to carefully lift up and remove
the firebox bottom.
6. Locate duplex outlet mounted to sup-
port bracket in lower right hand side of
firebox. Remove screw holding duplex
outlet to support bracket in bottom of
firebox.Removeduplexoutlet(see Fig-
ure 22).
7. Clamp electricalcablehard-wiring into
firebox through smallest hole using
strain relief fitting provided (see Fig-
ure 23).
8. Connect electricalcable toduplexoutlet.
Match wire colors to those on duplex
outlet. Be sure to connect ground wire.
9. Replace duplex outlet with screw.
10. You may now install GA3700 Blower
Accessory if desired, see Installing Op-
tional Blower Accessory, page 11.
11. Replace firebox bottom with four
Phillips screws.
12. If applicable carefully replace firebrick
panels in reverse order (see Figures 18
through 20, page 12).
Strain
Relief
Fitting
Small Hole
Electric
Cables
Figure 23 - Installing Strain Relief Fitting
into Electrical Access Hole

14
105605
UNVENTED (VENT-FREE) LOGMATE
®
FIREBOX
VANGUARD
TECHNICAL
SERVICE
You may have further questions about in-
stallation, operation, or troubleshooting.
Ifso,contactDESAInternational’sTechni-
cal Service Department at
1-800-DESA LOG (1-800-337-2564).
You can also visit DESA International’s
technical services web site at
www.desatech.com.
Note :Use only original replacement parts.
Thiswillprotectyourwarrantycoveragefor
parts replaced under warranty.
PARTS UNDER WARRANTY
Contact authorized dealers of this product.
If they can’t supply original replacement
part(s), call DESA International’s Techni-
cal Service Department at
1-800-DESA LOG (1-800-337-2564).
When calling DESA International, have
ready
• your name
• your address
• model number of your firebox
• how firebox was malfunctioning
• type of gas used (propane or natural gas)
• purchase date
Usually,wewillaskyoutoreturnthedefec-
tive part to the factory.
PARTS NOT UNDER
WARRANTY
Contactauthorizeddealersofthisproduct.If
theycan’tsupplyoriginalreplacementpart(s),
callDESA International’sParts Department
at 1-800-972-7879 for referral information.
WhencallingDESAInternational,haveready
• model number of your firebox
• the replacement part number
Note : The firebox identification label (in-
cludingmodelnumber,serialnumber,clear-
ances, etc.) is located behind the left side
firebrick panel. See Figure 18, page 12.
REPLACEMENT
PARTS
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INSTALLING FIREPLACE
HOOD AND SCREEN
1. Attach hood to firebox using (7) #10 x
3/8" phillips screws provided (see Fig-
ure 24).
Figure 24 - Screw and Hood Placement
for Hood
Screw
Rear Hole
Top View of Rod Layout
Rod
Front Hole
Ring
Screen
2. Insert eachrodthrough all ringslocated
at top of screen.
3. Insert first rod into rear hole in left side
of firebox. Fasten rod to rear hole near
center of firebox using #10 x 3/8"
Phillipsscrew provided(see Figure25).
4. Insert other rod into front hole on right
sideoffireboxandfasten using remain-
ing Phillips screw.
Figure 25 - Installing Fireplace Screen (Models FB36CB and FB42CA Shown)

15
105605
OWNER’S MANUAL
BRASS TRIM ACCESSORY
(Not Shown)
GA6091 (36" Models)
GA6092 (42" Models)
Optionalwithbuilt-ininstallation.Provides
a finished appearance covering rough and/
orunfinishedmantelorwallopening edges.
ACCESSORIES
Purchasethesefireboxaccessoriesfromyour
local dealer. If they can not supply these
accessories,callDESAInternational’sSales
Department at 1-800-432-2382 for infor-
mation. You can also write to the address
listed on the back page of this manual.
CABINET MANTEL
ACCESSORY WITH
FIREBOX PERIMETER
BRASS TRIM
GM103U Series - Unfinished
Birch Veneer (36" Models)
Dimensions (WxHxD): 63" x 51" x 24 1/2"
GM105U Series - Unfinished
Birch Veneer (42" Models)
Dimensions (WxHxD): 69" x 51" x 24 1/2"
BLOWER ACCESSORY -
GA3700
Use with Models FB36CB, NFLB36C, or
FB42CA only. The variable blower allows
you to select the desired speed. The blower
circulates heated air from the fireplace into
the room.
MANUAL SHUTOFF VALVE -
GA5010
Manual shutoff valve with 1/8" NPT tap.
BRASS HOOD ACCESSORY
(Not Shown)
GA6097 (36" Models)
GA6098 (42" Models)
Decorative polished brass hood enhances
the appearance of the firebox.
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
,,,,,
BRASS ACCENT TRIM
ACCESSORY
GA6088 (36" MODELS)
GA6089 (42" Models)
Seven piece magnetic polished brass trim
enhances the appearance of the firebox.

16
105605
UNVENTED (VENT-FREE) LOGMATE
®
FIREBOX
VANGUARD
ILLUSTRATED
PARTS
BREAKDOWN
FB36NCA
NLFB36NC
FB42NC
7
17
17
16
17
19 19
19
8
17
9
17
15
10
,,,,,,
,,,,,,
,,,,,,
,,,,,,
,,,,,,
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,,,,,,
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,,,,,,
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,,,,,,
,,,,,,
,,,,,,
18
14
12
18
18
11
4*
2*
13
18
18
20
6*
3*
2*
18
1
5*
*Not Included with Model NLFB36NC

17
105605
OWNER’S MANUAL
PARTS LIST This list contains replaceable parts used in your firebox. When ordering parts, follow the instructions
listed under Replacement Parts on page 13 of this manual.
FB36NCA
NLFB36NC
FB42NC KEY PART NUMBER
NO. FB36NCA NLFB36NC FB42NC DESCRIPTION QTY.
1 103437-01 103437-01 103437-02 Firebox Top 1
2 103608-01 * 103608-01 Firebrick Retainer 3
3 105164-01 * 105164-02 Rear Firebrick 1
4 105165-01 * 105165-01 Left Side Firebrick 1
5 105166-01 * 105166-01 Right Side Firebrick 1
6 105167-01 * 105167-02 Bottom Firebrick 1
7 103796-01 103796-01 103796-02 Outer Casing 1
8 103440-01 103440-01 103440-02 Outer Casing Bottom 1
9 103797-01 103797-01 103797-02 Firebox Wrapper 1
10 103297-02 103297-02 103297-02 Screen Assembly 2
11 103444-01CK 103444-01CK 103444-02CK Hood 1
12 103442-02CK 103442-02CK 103442-04CK Front Assembly 1
13 103445-01 103445-01 103445-02 Firebox Bottom 1
14 103452-01 103452-01 103452-02 Screen Rod 2
15 101348-01 101348-01 101348-01 Firebox Supports 2
16 103438-01 103438-01 103438-02 Outer Casing Top 1
17 M11084-26 M11084-26 Hex Head Screw, #10-16 57
M11084-26 Hex Head Screw, #10-16 60
18 098304-01 098304-01 Phillips Pan Head Screw 22
098304-01 Phillips Pan Head Screw 19
19 098194-02 098194-02 098194-02 Standoff Bracket 3
20 103436-01 103436-01 103436-02 Deflector 1
*Not Included with Model NLFB36NC

18
105605
UNVENTED (VENT-FREE) LOGMATE
®
FIREBOX
VANGUARD
ILLUSTRATED
PARTS
BREAKDOWN
FB36CB
NLFB36C
FB42CA
7
17
17
16
17
19
22 22
22
8
17
9
17
15
21
20
10
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18
14
12
18
18
11
4*
2*
3*
2*
18
13
18
18
6*
1
5*
*Not Included with Model NLFB36C

19
105605
OWNER’S MANUAL
PARTS LIST This list contains replaceable parts used in your firebox. When ordering parts, follow the
instructions listed under Replacement Parts on page 13 of this manual.
FB36CB
NLFB36C
FB42CA
KEY PART NUMBER
NO. FB36CB NLFB36C FB42CA DESCRIPTION QTY.
1 103437-03 103437-03 103437-04 Firebox Top 1
2 103608-01 * 103608-01 Firebrick Retainer 3
3 105164-01 * 105164-02 Rear Firebrick 1
4 105165-01 * 105165-01 Left Side Firebrick 1
5 105166-01 * 105166-01 Right Side Firebrick 1
6 105167-01 * 105167-02 Bottom Firebrick 1
7 103796-01 103796-01 103796-02 Outer Casing 1
8 103440-01 103440-01 103440-02 Outer Casing Bottom 1
9 103797-01 103797-01 103797-02 Firebox Wrapper 1
10 103297-02 103297-02 103297-02 Screen Assembly 2
11 103444-01CK 103444-01CK 103444-02CK Hood 1
12 103442-01CK 103442-01CK 103442-03CK Front Assembly 1
13 103445-01 103445-01 103445-02 Firebox Bottom 1
14 103452-01 103452-01 103452-02 Screen Rod 2
15 101348-01 101348-01 101348-01 Firebox Supports 2
16 103438-01 103438-01 103438-02 Outer Casing Top 1
17 M11084-26 M11084-26 Hex Head Screw, #10-16 50
M11084-26 Hex Head Screw, #10-16 53
18 098304-01 098304-01 Phillips Pan Head Screw 22
098304-01 Phillips Pan Head Screw 19
19 103771-01 103771-01 103771-01 Strain Relief Fitting 1
20 103769-01 103769-01 103769-01 Duplex Outlet 1
21 M12461-2 M12461-2 M12461-2 Outlet Mounting Screw 1
22 098194-02 098194-02 098194-02 Stand-off Bracket 8
*Not Included with Model NLFB36C

LIMITED WARRANTY
VENT-FREE FIREBOX
DESA International warrants this product to be free from defects in materials and components for four (4) years from the date of first
purchase, provided that the product has been properly installed, operated and maintained in accordance with all applicable instructions. To
make a claim under this warranty the Bill of Sale or cancelled check must be presented.
Thiswarrantyisextendedonlytotheoriginalretailpurchaser.Thiswarrantycoversthecostofpart(s)requiredtorestorethisheatertoproper
operating condition and an allowance for labor when provided by a DESA Authorized Service Center. Warranty part(s) MUST be obtained
through authorized dealers of this product and/or DESA International who will provide original factory replacement parts. Failure to use
original factory replacement parts voids this warranty. The heater MUST be installed by a qualified installer in accordance with all local
codes and instructions furnished with the unit.
Thiswarrantydoes not applytopartsthatare not inoriginalconditionbecauseof normal wearandtear,orparts that failorbecomedamaged
as a result of misuse, accidents, lack of proper maintenance or defects caused by improper installation. As with all concrete liners, this liner
may develop slight cracks when exposed to heat. This cracking is considered normal. Travel, diagnostic cost, labor, transportation and any
and all such other costs related to repairing a defective heater will be the responsibility of the owner.
TO THE FULL EXTENT ALLOWED BY THE LAW OF THE JURISDICTION THAT GOVERNS THE SALE OF THE PRODUCT;
THIS EXPRESS WARRANTY EXCLUDES ANY AND ALL OTHER EXPRESSED WARRANTIES AND LIMITS THE DURATION
OF ANY AND ALL IMPLIED WARRANTIES, INCLUDING WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
PARTICULAR PURPOSE TO FOUR (4) YEARS ON ALL COMPONENTS FROM THE DATE OF FIRST PURCHASE; AND DESA
INTERNATIONAL’S LIABILITY IS HEREBY LIMITED TO THE PURCHASE PRICE OF THE PRODUCT AND DESA INTERNA-
TIONAL SHALL NOT BE LIABLE FOR ANY OTHER DAMAGES WHATSOEVER INCLUDING INDIRECT, INCIDENTAL OR
CONSEQUENTIAL DAMAGES.
Some states do not allow a limitation on how long an implied warranty lasts or an exclusion or limitation of incidental or consequential
damages, so the above limitation on implied warranties, or exclusion or limitation on damages may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights that vary from state to state.
For information about this warranty write:
2701 Industrial Drive
P.O. Box 90004
Bowling Green, KY 42102-9004
www.desatech.com
KEEP THIS WARRANTY
WARRANTY INFORMATION
Model
Serial No.
Date Purchased
Always specify model and serial numbers when communicating with the factory.
We reserve the right to amend these specifications at any time without notice. The only warranty applicable is our standard written warranty. We
make no other warranty, expressed or implied.
105605-01
Rev. A
03/99
NOT A UPC
105605 01