Comfort Glow CGFB36CA 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)
36" UNIVERSAL FIREBOX
OWNER’S OPERATION AND INSTALLATION MANUAL
CGFB36CA
Circulating Model
®
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
105161
UNVENTED (VENT-FREE) FIREBOX
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 36 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-
ingfireplace.UseonlyANSZ21.11.2cer-
tified unvented room heaters (log sets).
4. Do not add extra logs or ornaments
suchaspinecones, vermiculite, or rock
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. Use
only the provided hood, or approved
hood accessory. See Accessories on
page 19.
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
servicing. Only a qualified service per-
son 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
under water due to the shock hazard
that could result with the blower acces-
sary (if installed) in place.

3
105161
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.
3. Check carton contents for the
following:
• Screen assembly
• Screen support rod
• Hardware and parts bag containing
the following:
- OwnersOperationandInstallation
Manual
- 2 - Black #10 x 3/8" Phillips
screws for mounting screen
support 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.
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
usedwithouttheblower,thefireboxrequires
noelectricity makingitidealforemergency
back-up heat.
Blower Accessory
The CGFB36C firebox will accept the
GA3750 accessory. The variable blower
allows you to select the fan speed you de-
sire. The blower circulates heated air from
the firebox into the room. Use of blower is
optional.
Brick Liner
This firebox features a concrete brick liner.
As with all concrete liners, this liner may
developslightcrackswhenexposedtoheat.
These cracks will not affect the perfor-
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-
lowforwalland ceiling clearances (see
Installation Clearances, page 8).
2. Everything needed to complete instal-
lation.
3. These models CANNOT be installed
in a bedroom or bathroom.
4. Proper air for combustion and ventila-
tion (page 5).
Notice:Thefireboxidentification
label (including model number,
serial number, clearances, etc.)
is on the left front edge of the
firebox. See Figure 14, page 11)

4
105161
UNVENTED (VENT-FREE) FIREBOX
PRODUCT
SPECIFICATIONS
Figure 1 - Firebox Front View
Figure 2 - Firebox Side View
41 11/16"
36"
15 7/8"
35"
2 5/8"
2 5/8"
6 5/8"
19 3/8"
Built-in Nailing
Flanges
Standoffs
Louvers
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)
Figure 3 - Firebox Top View
30 3/8"
42 3/8"
36"
41"
29 1/8"
19 1/2"
22 1/4"
5/8"

5
105161
OWNER’S MANUAL
PROVIDING ADEQUATE
VENTILATION
ThefollowingisexerptsfromNationalFuel
Gas Code. NFPA 54/ANS Z223.1, Section
5.3, Air for Combustion and Ventilation.
Allspacesinhomesfallintooneofthethree
following ventilation classifications:
1. Unusually Tight Contruction
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:Thisfirebox shall
not be installed in a confined
space or unusually tight con-
struction unless provisions are
provided for adequate combus-
tion and ventilation air. Read the
following instructions to insure
properfreshairforthisandother
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
105161
UNVENTED (VENT-FREE) FIREBOX
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.
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 gas log set, 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
ventillation air by one of the methods described in the National Fuel Gas Code, ANS Z223.1, 1992, Section 5.3 or
applicable local codes.
Example:
Gas water heater 40,000 Btu/Hr
Gas firebox
logs +39,000 Btu/Hr
Total =79,000 Btu/Hr

7
105161
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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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
105161
UNVENTED (VENT-FREE) FIREBOX
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
openingtoany combustiblewallshould
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.
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
objectsarelessthan36inches
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 19) or as a built-in unit. The
clearances are the same for either installa-
tion method.
Note: Your Comfort Glow firebox is de-
signed to be used in zero clearance installa-
tions.Wallorframingmaterialcanbeplaced
against any exterior surface on the rear,
sides or top of your firebox, except where
stand-off spacers are integrally attached. If
stand-off spacers are attached to your fire-
box, these spacers can be placed directly
against wall or framing materials.
Use dimensions shown for rough openings
tocreatetheeasiestinstallation(seeBuilt-In
Firebox Installation, page 9).
NOTICE: This firebox in combi-
nation with unvented logsets are
intended for use as supplemen-
tal heat. Do not install them as
your primary heat source. In the
eventofapoweroutage,youcan
use unvented logs as your pri-
mary heat source.

9
105161
OWNER’S MANUAL
FRONT WIDTH DEPTH
MODEL # (Inside to Inside) HEIGHT (Minimum)
CGFB36CA 41 1/4" 37" 20"
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 for rough opening.
2. Install gas piping to firebox location.
SeeInstalling Gas Line on page 11 and
Connecting to Gas Supply in log set
owners manual.
IMPORTANT: If installing blower acces-
sory, see Hard-Wiring Firebox, page 11.
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
are available (see Accessories, page 19).
The brass trim will extend past sides of
firebox approximately 1/2 inch.This will
cover the rough edges of the wall opening.
Ifinstallinga mantelabovethe firebox, you
must follow the clearances shown in Figure
7. Follow the instructions below to install
the firebox in this manner.
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
Figure 8b
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
Height - 35 1/2"
Supplied Firebox
Hood Must Be
Used at All Times
Wire-mesh
Screen
Firebox
Non-combustible
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

10
105161
UNVENTED (VENT-FREE) FIREBOX
INSTALLATION
Continued
3. Carefully set firebox in front of rough
opening with back of firebox inside
wallopening. IMPORTANT: If install-
ing Brass Trim Kit GA7091, see in-
structions included with brass trim ac-
cessory. 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 GA7091 Brass Trim
Kit, install the trim after final finishing
and/orpaintingof wall.Seeinstructions
included with brass trim accessory for
attaching brass trim.
7. Install and properly test gas log heater.
Follow installation instructions in-
cludedwiththevent-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: Non-combustiblematerials
suchasbrick,tile,etc.mayoverlapthefront
facing, but should never cover any neces-
sary openings like louvered slots.
WARNING:Donotallownon-
combustible materials to cover
anynecessaryopeningslikelou-
vered slots.
WARNING: Use only non-
combustiblemortaroradhesives
when overlapping the front fac-
ing with non-combustible facing
material.
WARNING: Never modify or
cover the louvered slots on the
front of the firebox.
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 (see Accessories, page 19).
1. Assemble cabinetmantelaccessory and
the brass trim kit. Assembly instruc-
tions are included with each accessory.
2. If using an optional blower (circulat-
ing models only), install a properly
grounded, 120 volt three-prong elec-
trical outlet at firebox location if an
outlet is not there. If possible, locate
outlet so cabinet mantel will cover it
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
105161
OWNER’S MANUAL
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 installa-
tion. Follow all local codes. In
absenceoflocalcodesfollow The
NationalElectricCodeANS/NFPA
70.
ModelCGFB36CAcanbehard-wired tothe
duplex outlet located inside the firebox bot-
tomifdesired. Thisallowsthe bloweracces-
sory to be plugged into the duplex outlet.
1. Using 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 14 - Removing Side Panel
INSTALLING GAS LINE
NOTICE: A qualified service per-
son must connect heater to gas
supply. Follow all local codes.
IMPORTANT: SeeConnectingtoGasSup-
plyinyourlogsetownersmanualfordetails
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
6. Install the brass trim kit furnished with
mantel. See instruction sheet included
with the mantel now.
7. If installing the optional blower (cir-
culating models only), see instruction
sheet included with blower now.
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-
cludedwiththevent-free gas log heater
that is being installed.
INSTALLATION
Continued
Figure12 -Inserting FireboxInto Cabinet
Mantel
Hole
(Use One) Gas Line Hole
Manual
Shutoff
Valves
(Install
One)
Locate the hole in one of the firebrick
sidewall liners (see Figure 13). This hole
willlineupwiththeholeintheoutercasing.
Retainer
Bracket
Left Side Firebrick Liner Panel
Screw
Continued
Product
Identification
Label

12
105161
UNVENTED (VENT-FREE) FIREBOX
2. Remove the screw and retainer bracket
at the top of the brick liner panel in the
back of the firebox (see Figure 15). Do
not let the panel fall after the bracket is
removed. Carefully remove the rear
firebrick liner panel from the firebox.
INSTALLATION
Continued
Figure15-RemovingRearFirebrickLiner
Panel
CAUTION: Do not let the fire-
brick liner panel fall after the
bracket is removed.
Screw
Rear Firebrick
Liner Panel
Bracket
3. Carefully lift and remove the bottom
firebrick floor from bottom of firebox
(see Figure 16).
4. Remove four Phillips screws in firebox
bottom.
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.Removeduplex outlet(seeFig-
ure 18).
7. Clamp electricalcablehard-wiring into
firebox through smallest hole using
strain relief fitting provided (see Fig-
ure 19).
Screws
Finger
Holes
Firebox
Bottom
Screws
Figure 17 - Removing Firebox Bottom
Screw
Duplex
Outlet
Support
Bracket
Electric
Cables
Figure 18 - Removing Duplex Outlet
Strain
Relief
Fitting
Small Hole
Electric
Cables
Figure 19 - Installing Strain Relief Fitting
into Electrical Access Hole
Figure 16 - Removing Bottom Firebrick
Floor
8. Connect electrical cable to duplex out-
let.Matchwire colors to thoseonduplex
outlet. Be sure to connect ground wire.
9. Replace duplex outlet with screw.
10. You may now install GA3750 Blower
Accessory if desired. See installation in-
struction sheet included with blower kit.
11. Replace firebox bottom with four
Phillips screws.
12. Carefully replace firebrick panels in
reverse order (see Figure 14, page 11
and Figures 15 and 16, this page).

13
105161
OWNER’S MANUAL
1. Remove the firebrick liner (if still in
place).
a. Using a Phillips screwdriver, remove
the screw and retainer bracket at the
top of the brick liner panel on the left
side. Carefully remove the left panel
from the firebox (see Figure 20).
b.Repeat the removal steps for the
brick liner panel on the right side.
c.Remove the screw and retainer
bracket at the top of the brick liner
panel at the rear of the firebox.
IMPORTANT: Do not let panel fall
after the bracket has been removed.
Carefullyremovethe rear panelfrom
the firebox (see Figure 21).
d.Carefully lift and remove the bottom
firebrickfloorfrom the bottom ofthe
firebox (see Figure 22).
2. Remove the firebox bottom (if still in
place).
a. Remove the 4 screws that secure the
bottomofthe firebox (seeFigure 23).
b.Carefully raise and remove the fire-
box bottom from the firebox.
3. Place the blower against the lower rear
wall of the firebox outer wrapper with
theexhaust port directed upward.Align
the holes in top mounting tabs of
blower with holes in wall of wrapper
(see Figure 24). Using 2 screws pro-
vided,mountblower andtightenscrews
securely.
NOTICE:Ifalogsetisinstalledin
the firebox, disconnect log set
fromgassupplyandremovefrom
firebox. Contact a qualified ser-
vice person to do this.
Figure20-RemovingLeftPanelfromFirebox
Figure 21 - Removing Back Panel from
Firebox
Left
Panel
Back
Panel
Retainer Bracket Screw
Retainer Bracket
Screw
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.
INSTALLING MODEL GA3750
ACCESSORY BLOWER
INSTALLATION
Continued
Figure 23 - Removing Firebox Bottom
Screws
Figure 24 - Mounting Blower to Firebox
Blower
Screws
Lower Rear Wall of
Firebox Wrapper
Top
Mounting
Tab
Exhaust Port
Continued
Figure 22 - Removing Bottom Firebrick
Floor

14
105161
UNVENTED (VENT-FREE) FIREBOX
INSTALLATION
Continued
NOTICE: A qualified service per-
son must install heater. Follow
all local codes.
Note: Discardtheremaininghardwareitems.
Operating the Blower
Light your gas appliance with the blower
off.Afterabout 15 minutes, turntheblower
on to deliver heated air at the top louvers.
Theblowerfeaturesavariablecontrolwhich
allows you to select the speed you desire.
Note: Periodically check the louvers of the
firebox and remove any dust, dirt, or other
obstructions.
Variable
FanSwitch
WhiteWhite Black
Green
On
110/115
V.A.C.
Blower
Motor
Black
Black
Black
Off
Figure 27 - Location of Wiring Diagram
Decal
Wiring Diagram
Decal 12" in Front of
Blower
Floor
Supports 1 1/2"
Hole
Figure 25 - Installing Plastic Bushing for
Power Cord
1 1/2" Hole
Plastic
Bushing
Plastic
Hole Plug
Figure 26 - Attaching Speed Control to
Firebox
Speed
Control
Control
Shaft
Locknut
Control Knob
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 25). Remove the
plastic plug and discard.
6. Place speed control against inner wall
of front panel, pushing the plastic con-
trol shaft forward through the opening.
7. While supporting speed control, secure
control shaft with lock nut by pushing
and turning lock nut with pliers clock-
wise until it is tight against front panel.
Place control knob provided on shaft
(see Figure 26).
8. Turn on power to duplex outlet if pre-
viously turned off.
WARNING: Never touch the
blower wheel while in operation.
9. Plug in blower power cord.
a. Ifyourfireboxisinstalledasa free-
standing unit with an accessory
mantel,determinewhetherthepower
cord will exit the left side or the right
side of the firebox. Install 1 plastic
bushing provided into the 1 1/2" hole
in the floor support on the exit side.
Installthesecondplasticbushing pro-
vided into the 1 1/2" hole in the outer
casing through which the power cord
will exit (see Figures 25 and 27).
Route power cord through both plas-
tic bushings and plug the power cord
intoa wallreceptaclenearthefirebox.
b.If your firebox installation is re-
cessed and/or pre-wired, plug the
power cord into the duplex outlet
provided. Refer to your firebox
owner’s manual (Hardwiring Fire-
box, page 11) for instructions on wir-
ing the duplex outlet.
10. Check to makesurethat the powercord
is completely clear of the blower wheel
and that there are no other foreign ob-
jects in blower wheel. Turn blower on
and check for operation. Turn blower
off by turningknobfully counter-clock-
wise before continuing.
11. Peel off the backing paper and stick the
supplied wiring diagram decal on the
firebox bottom approximately 12" in
front of the blower (see Figure 27).
12. Replace and reattachfirebox bottomus-
ing4screws removedinstep 2 (seeFig-
ure 23, page 13).
13. Replace the bottom firebrick panel (see
Figure 22, page 13).
14. Replace the rear firebrick panel, re-
tainerbracketand screw (seeFigure21,
page 13).
15. Replace the right firebrick panel, re-
tainer bracket andscrew (see Figure 20,
page 13).
16. Replace the left firebrick panel, re-
tainer bracket and screw (see Figure
20, page 13).
17. Install the log set heater according to
the installation instructions supplied
with the heater.

15
105161
OWNER’S MANUAL
INSTALLING FIREPLACE
HOOD AND SCREEN
1. Attach hood to firebox using (7) #10 x
3/8" phillips screws provided (see Fig-
ure 28).
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"
Phillipsscrewprovided (seeFigure29).
4. Insert other rod into front hole on right
sideoffirebox and fastenusingremain-
ing Phillips screw.
Figure 28 - Screw and Hood Placement
for Hood
Figure 29 - Installing Fireplace Screen
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Screw
Rear Hole
Top View of Rod Layout
Rod
Front Hole
Ring
Screen
INSTALLATION
Continued

16
105161
UNVENTED (VENT-FREE) FIREBOX
ILLUSTRATED
PARTS
BREAKDOWN
CGFB36CA
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

17
105161
OWNER’S MANUAL
KEY
NO. PART NUMBER DESCRIPTION QTY.
1 103437-03 Firebox Top 1
2 103608-02 Firebrick Retainer 3
3 105164-02 Rear Firebrick 1
4 105165-01 Left Side Firebrick 1
5 105166-01 Right Side Firebrick 1
6 105167-01 Bottom Firebrick 1
7 103796-01 Outer Casing 1
8 103440-01 Outer Casing Bottom 1
9 103797-01 Firebox Wrapper 1
10 103297-02 Screen Assembly 2
11 103444-01CK Hood 1
12 103442-01CK Front Assembly 1
13 103445-01 Firebox Bottom 1
14 103452-01 Screen Rod 2
15 101348-01 Firebox Supports 2
16 103438-01 Outer Casing Top 1
17 M11084-26 Hex Head Screw, #10-16 50
18 098304-01 Phillips Pan Head Screw 22
19 103771-01 Strain Relief Fitting 1
20 103769-01 Duplex Outlet 1
21 M12461-2 Outlet Mounting Screw 1
22 098194-02 Stand-off Bracket 3
PARTS LIST This list contains replaceable parts used in your firebox. When ordering parts, follow the
instructions listed under Replacement Parts on page 18 of this manual.
CGFB36CA

18
105161
UNVENTED (VENT-FREE) FIREBOX
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-
calServiceDepartmentat1-800-323-5190.
REPLACEMENT
PARTS
PARTS
CENTRALS
These Parts Centrals are privately owned
businesses. They have agreed to support
ourcustomer’sneedsbyprovidingoriginal
replacement parts and accessories. When
calling a Parts Central, ask for the Parts
Department.
Baltimore Electric
1348 Dixwell Avenue
Hamden, CT 06514
1-800-397-7553
203-248-7553
Parts Department
Portable Heater Parts
342 N. County Rd. 400 East
Valparaiso, IN 46383
All States
219-462-7441
1-800-362-6951
Parts Department
F B D
1349 Adams Street
Bowling Green, KY 42103-3414
502-654-8534
1-800-654-8534
Four Flags Power Products
1115 Stateline Road
Niles, MI 49120
616-684-2697
1-800-268-4983
Parts Only
Master Parts Distributors
1184 Wilson Ave. NW
Grand Rapids, MI 49504-3458
616-791-8270
US 1-800-446-1446
Fax: [phone]
Parts Department
Washer Equipment Co.
1715 Main Street
Kansas City, MO 64108
KS, MO, AR
816-842-3911
Parts Department
East Coast Energy Products
707 Broadway
W. Long Branch, NJ 07764
732-870-8809
1-800-755-8809
Parts Department
Tarantin Tank Co.
P.O. Box 6129
Freehold, NJ 07728
908-780-9340
1-800-922-0724
Parts Department
Heater and Fireplace Store
1922 N. Route 9
Cape May Court, NJ 08210-1110
609-624-0678
Parts Department
Dayton Hardware
P.O. Box 275
North Dayton Station
Dayton, OH 45404
All States
937-258-3721
OH 1-800-762-3426
Parts Department
Halco Enterprises
208 Carter Drive, Unit 21
West Chester, PA 19382
610-430-7717
US 1-800-368-0803
Parts Department
LA Porte's Parts & Service
2444 North 5th Street
Hartsville, SC 29550
803-332-0191
Parts Department
Cans Unlimited, Inc.
P.O. Box 645
Taylor, SC 29687
All States
803-879-3009
1-800-845-5301
Parts Department
When calling DESA International, have
ready
• your name
• your address
• model number of your heater
• how heater was malfunctioning
• type of gas used (propane/LP or natural
gas)
• purchase date
Usually,wewillaskyoutoreturnthedefec-
tive part to the factory.
Parts Not Under Warranty
Contact authorized dealers of this product.
If they can’t supply original replacement
part(s), either contact your nearest Parts
Central (see above) or call DESA
International’s Parts Department at 1-800-
972-7879 for referral information.
When calling DESA International, have
ready
• model number of your heater
• the replacement part number

19
105161
OWNER’S MANUAL
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).
BRASS TRIM ACCESSORY
(Not Shown)
GA7091 (36" 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
GMC41F Series - Walnut Stained
Hardwood (36" models)
GMC42U Series - Unfinished
Hardwood (36" Models)
Dimensions (WxHxD): 63" x 51" x 24 1/2"
BLOWER ACCESSORY -
GA3750
Thevariableblowerallowsyoutoselectthe
desiredspeed. Theblowercirculatesheated
air from the fireplace into the room.
MANUAL SHUTOFF VALVE -
GA5010
Manual shutoff valve with 1/8" NPT tap.
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LIMITED WARRANTY
VENT-FREE FIREBOX
DESAInternationalwarrantsthisproducttobefreefromdefectsinmaterialsandcomponentsfortwo(2)yearsfromthedateoffirstpurchase,
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 TWO (2) 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
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.
105161-01
Rev. A
09/98
NOT A UPC
105161 01