This book is valuable. In addition to instructing you
on how to install and maintain your appliance, it also
contains information that will enable you to obtain
replacement parts or optional accessory items when
needed. Keep it with your other important papers.
23 5/16"
13/16"
1
13
/8"
ROUND TOP
TERMINA TION
Model ________________________________
Serial No. _____________________________
Date Purchased ________________________
22"
1
/2"
17
3
/8"
37
13
/16"
41
STORM COLLAR
FLASHING
1
43
/4"
7
/16"
38
3
1
/8"
OPENING FOR
OUTSIDE
AIR KIT
3
12
/4"
1
/2"
8
®
42"
9
/16"
44
GAS LINE
CONDUIT SLEEVE
(BOTH SIDES)
22"
12
1
/4"
1
22
/16"
3
/8"
7
0 IN. TO
TOP SPACER
3/4" AIR SPACE
BACK AND SIDES
OUTSIDE AIR
(LEFT SIDE ONLY)
0 IN. TO
BOTTOM
12 IN.
EACH SIDE
2 IN. AIR SPACE
TO COMBUSTIBLE
MATERIALS
FIRESTOP
COMBUSTIBLE
WALL BOARD
NO COMBUSTIBLE
MATERIAL ON FACE
NOT LESS
THAN 24 IN. TO
PERPENDICULAR
SIDEWALL
HEARTH EXTENSION
66 IN. x 20 IN.
DESA INTERNATIONAL, 2701 INDUSTRIAL DRIVE, P.O. BOX 90004, BOWLING GREEN, KY 42102-9004
55951
Rev. B
09/99
FOR YOUR SAFETY
• Do not store or use gasoline or any other flammable vapors or liguids in the vicinity of this or
any other appliance.
• Due to high temperatures, the appliance should
be located out of traffic and away from furniture
and draperies.
• Do not place clothing or other flammable materials on or near the appliance.
• NEVER leave children unattended when a fire is
burning in the fireplace.
WARNING: Improper installation, adjustment, alteration, service, or maintenance can cause injury, property damage, or loss of life. Refer to this manual. For
assistance or additional information consult a qualified installer or local distributor.
WARNING: This fireplace is intended for use with
wood, decorative gas appliance, and vent-free gas
logs which burn propane/LP or natural gas only.
CHECK LOCAL CODES PRIOR TO INSTALLATION
INSTALLATION
INSTRUCTIONS
INTRODUCTION
Before beginning the installation of your firebox, read these instructions through, completely.
These Comfort Glow components and fireboxes are safe when
installed according to this Installation Manual. Unless you use
Comfort Glow components which have been designed and tested for
the firebox system, you may cause a fire hazard.
The DESA International warranty will be voided by, and DESA
International disclaims any responsibility for the following actions:
a)Modification of the firebox, components, doors, blower fans,
air inlet system and damper control.
b)Use of any component part not manufactured or approved by
DESA International, in writing, in combination with a DESA
International firebox system.
Refer to your Homeowners guide for warranty information.
This wood burning fireplace complies with UL127 as a FactoryBuilt Fireplace and is listed and tested by Underwriters Labo-
ratory, Inc.
This model is not for use in mobile homes.
MINIMUM CLEARANCES TO COMBUSTIBLES
Framing and enclosures may safely make direct contact with the
spacers on the top of the firebox. The firebox may sit directly on
combustible flooring (see Step 4, below). The firebox opening must
not be less than 24 inches from combustible materials and the chimney
must be absolutely maintained. A 16
1
/2 inch inside chase dimension
is recommended as a minimum size. A 3/4 inch air space is required
around back and sides of firebox.
Keep all combustible furnishings a considerable distance from the
firebox.
WARNING: Never use gasoline, gasoline-type lantern
fuel, kerosene, charcoal lighter fluid, or similar liquids to start or “freshen up” a fire in this firebox. Keep
all such liquids well away from the firebox.
WARNING: Do not pack required air spaces with
insulation or other material.
HEIGHT: The minimum height of the chimney, measured from the
base of the firebox to the flue gas outlet, is 16 feet for a straight
chimney or with one elbow set. For systems with 2 elbow sets, the
minimum height is 30 feet. The maximum height of any system is 60
feet. This measurement includes the firebox, chimney sections and
the effective height of the termination assembly.
GENERAL
Read the Warranty and Operating guidelines supplied with this
firebox. Following these simple guidelines will ensure years of
trouble free and safe usage of your firebox. If the Warranty and
Operating instructions are not in your firebox, write to the address
listed on the front cover.
INSTALLING THE FIREBOX
STEP 1: Frame the opening for the firebox using the dimensions
shown in Figure 1 or Figure 2.
STEP 2: Set the firebox directly in front of this opening and slide the
unit back until the mounting flanges touch the side framing.
STEP 3: Check the level of the firebox and shim with sheet metal if
necessary.
STEP 4: When the firebox is installed upon a combustible floor a
galvanized steel ember protector (provided) must be installed between the firebox and the hearth extension as illustrated in Figures
12 and 13.
STEP 5: Secure the firebox to the framing through the flanges
located on the sides on the firebox with nails, or screws.
Note:
The 3/4" clearance is not required at the nailing flange. (see
Figure 10)
WARNING: Do not install a fireplace insert in this
firebox unless the manufacturer’s instructions with
the insert specifically state this firebox has been
tested for use with the insert.
PROPER INSTALLATION is the most important step in ensuring
safe and continuous operation of this firebox. Consult the local
building codes as to particular requirements concerned with the
installation of all factory built fireboxes. Although grounding may
not be required by code it is recommended by the manufacturer.
This firebox is not intended to be used as a substitute for a
furnace to heat an entire home. Use for supplementary
heating only.
45 1/4"
Figure 1 - Framing Dimensions
2
43
3
/16"
11
1
/2"
23 5/8"
55951
3
15
/8"
46 5/8"
33"
5
/8"
12
66"
Figure 2 - Framing Dimensions
ASSEMBLING AND INSTALLING YOUR
DOUBLE-WALL CHIMNEY SYSTEM
Each double wall chimney section consists of an outer pipe, flue pipe and
one wire spacer. The pipe sections are not unitized and must be
assembled independently as the chimney is installed. When starting the
chimney directly on the firebox, the flue pipe section must be installed
first, with the lanced side up. The outer pipe section can then be installed
over the flue pipe section with the hemmed end up. (see Figure 3A).
Press down on each pipe section until the lances securely engage the
hem on the firebox starter. The wire spacer will assure the proper
spacing between the inner and outer pipe sections.
LINEAL GAIN: THE ACTUAL
MEASURABLE LENGTH OF A
PART AFTER TWO OR MORE
Continue to assemble chimney sections as outlined above, making
sure that both inner and outer pipe sections are locked together.
Before installing double wall “snap lock” chimney together, it is
important to assure the joint between the chimney sections are
locked. Check by pulling chimney upward after locking. The chimney will not come apart if properly locked. It is not necessary to add
screws to keep the chimney together.
WARNING: The opening in the collar around the
chimney at the top of the fireplace must not be
obstructed. Never use blown insulation to fill the
chimney enclosure (see Figure 3B).
FIREPLACE
COLLAR
LINEAL GAIN
TERMINATION 6
KEEP THIS
AREA OPEN
5
/
8
8
8
8
FIRESTOP SPACERS
Firestop spacers are required at each point where the chimney
penetrates a floor or ceiling joist space. Their purpose is two fold,
they establish and maintain the required clearance between the
chimney and combustible materials, and provide complete separation from one floor space to another floor or attic space as required
by most codes. When penetrating a floor or ceiling at an angle,
firestop in pack should be used.
When the double wall pipe passes through a framed opening into an attic
space, the firestop must be placed into the attic floor as in Figure 4.
When the pipe passes through a framed opening into a living space above,
the firestop must be placed on to the ceiling from below as in Figure 5.
Figure 4
Figure 5
SUPPORT SECTIONS
The chimney support section is a 4 strap 12” length of pipe. A
chimney support is required at the 30 foot level above the fireplace
after a straight on the fireplace and elbows when high chimneys are
installed.
C12S-8DM
V12S-8DM
C12S-8DM
SUPPORT
SUPPORT
30 FT.
V12S-8DM
SUPPORT
SUPPORT
30 FT.
RETURN
ELBOW
Figure 6
BLOWER ASSEMBLY (CBK3)
A blower assembly is available for use with this fireplace as an option.
It is designed to be installed on DESA International factory pre-wired
fireplaces only. The blower assembly model CBK3 can be installed
prior to or after installation of the fireplace. Use of blowers or fans
other than manufactured by DESA International voids the warranty.
The optional blower is operated by a switch located on the lower face.
Flipping the switch turns the blowers on or off.
Note:
Fireplace must be wired to the house electrical system in order for
blowers to operate. See instructions provided with blower assembly.
Electrical connections are made through the cover on the side of the
fireplace illustrated in Figure 7. Use 14 AWG min. copper wire for
all connections. Be certain the fireplace is properly grounded.
BLOWER
SWITCH
Figure 3B
55951
ELECTRICAL
COVER PLATE
GROUND SCREW
STRAIN RELIEF
Figure 7
3
EXISTING “J” BOX
IN FIREPLACE
WIRE NUT (TYP.)
COVER PLATE WITH
STRAIN RELIEF
TO WALL SWITCH
10', 14 GA. W/GROUND
ROMEX ADDED TO U.L.
LISTED (MM11306)
FIREPLACE AT THE
FACTORY
Figure 8
PENETRATING THE ROOF
To maintain a 2-inch clearance to the pipe on a roof with a pitch, a
rectangular opening must be cut.
STEP 1: Determine the center point through which the pipe will
penetrate the roof.
STEP 2: Determine the pitch of the roof. Pitch is the distance the roof
drops over a given span, usually 12 inches. A 6/12 pitch means that
the roof drops 6 inches for each 12 inches measured horizontally.
STEP 3: From the center point determined in STEP 1, measure an
opening 17
point). For a roof pitch between 0/12 (flat) and 6/12, measure an
opening 21 inches long (10
1
/4 inches wide (8 5/8 inches to each side of the center
1
/2 inches above and below the center
point).
6/12 to 12/12 pitches: Measure 26 inches (13 above and below).
12/12 to 18/12 pitches: Measure 32
1
/2 inches (16 1/4 above and below).
18/12 to 24/12 pitches: Measure 40 inches (20 above and below).
STEP 4: Remove the roofing around the opening measured and cut
out this section.
STEP 5: Add the next sections of pipe until the end penetrates the
roof line. Check to see that proper clearances are maintained. Extend
chimney by adding sections of double wall pipe until pipe is a
minimum of 30 inches above highest point of roof cutout. Termination and chimney must extend a minimum of 36 inches above highest
point where it passes through roof.
10 FOOT RULE
All chimney terminations must extend a minimum of 3 feet in height
above the highest point where it passes through the roof and must be
at least 2 feet above the peak of the roof if within a horizontal distance
of 10 feet from the peak (see Figure 8).
3' MIN.
LEVEL OF FLUE
GAS OUTLET
10'
2' MIN.
3' MIN.
10'
OR LESS
2' MIN.
10 FOOT RULE
Figure 8
TERMINATIONS
The fireplace and chimney system must be vented to the out-of-doors
and must be terminated with the listed round top or chase terminations. If a chase termination is desired, refer to the instructions
supplied with the termination.
FOR ROUND TOP TERMINATION ON ROOF
STEP 1: Slide the flashing over the pipe (no firestop is needed at the
roof level). Tack the flashing down at the top two corners with
roofing nails. Lay roofing over the top and sides of the flashing and
secure them to the roof through the flashing with roof nails. Place
roofing under the lower edge and secure to the roof.
Cover all nail heads with mastic or roof cement.
STEP 2: Install the storm collar on double wall chimney, push collar
down to flashing and seal (see Figure 9).
STEP 3: Place the CRTL-8DM on to the pipe end as illustrated and
secure with the screws provided.
IMPORTANT:
If an exposed portion of chimney is greater than 5
feet above the roof line, use support wires to keep chimney secure.
The support wires may be attached to the outer pipe of the chimney
with screws, provided the screws are no longer than 3/4".
CRTL-8DM
ATTACH BRACKET
TABS TO OUTER
PIPE (3 PLACES)
SECURE WITH
SCREWS
OVERLAP
SHINGLES
TOP AND SIDES
FLUE PIPE OF CRTL-8DM
INSIDE INNER PIPE OF
CHIMNEY
CAULK
COLLAR
FLASHING
UNDERLAP SHINGLES
BOTTOM ONLY
Figure 9
FIREPLACE ENCLOSURE: COLD CLIMATE
INSTALLATIONS
Before finishing the enclosure around the fireplace, inspect all joints
around the fireplace. Any gaps between the nailing flanges and the
framing should be sealed with noncombustible insulation or caulking (see
Figure 10). Inspect the fireplace joints for possible gaps caused by
shipping or mishandling during installation. These should be sealed with
noncombustible materials. If the fireplace is mounted on a raised platform
insulate below the platform to prevent the entry of cold air through the
fireplace bottom by means of conduction. The above steps are import
especially if the fireplace is installed in cold weather climate. The opening
around the base of the chimney must remain open and free to circulate
outside air for keeping the chimney cool as designed (see Figure 3B, page
3). The fireplace must be set on a continuous platform to prevent cold air
from conducting through the metal bottom. The platform bottom may be
constructed of any wood product or other materials such as cement.
SIDE
FIREPLACE
SIDE FRAME
PACK
INSULATION
HERE
NORMAL FRAMING
FRAMING
3/4 CLEARANCE
NOT REQUIRED
AT THE FRAMING
CAULK HERE
SIDE
FRAMING
WARNING: Do not seal ventilation openings on the
rooftop flashing. Follow the installation instructions
provided with the termination being used.
4
Figure 10
WIDE FRAMING
FIREPLACE
SIDE FRAME
55951
GAS LINE
DAMPER
WEIGHT
TO CLOSE
DAMPER
A gas line may be installed for the purpose of installing a decorative
gas appliance available through your local distributor. Use only 1/2"
black iron pipe and appropriate fittings. When installing a gas line,
a shut-off valve designed for installation outside the firebox is
recommended.
To install, remove the gas line plug located in the side firebrick
approximately 2" above the bottom, The plug must be tapped out
from the finished side towards the unfinished side (see Figure 11A).
OUTSIDE OF
FIREPLACE
GAS LINE
CONDUIT
REMOVE
INSULATION
TEMPORARILY
(DO NOT
DISCARD)
REMOVE
GAS CONDUIT
COVER
Figure 11A
REMOVE
KNOCKOUT
AFTER REMOVING
GAS LINE COVER
PLATE, REPLACE
SCREWS
SIDE FIREBRICK
FINISHED SIDE
REFRACTORY
KNOCKOUT PLUG
REMOVE BY TAPPING
LIGHTL Y WITH A
1/2" DOWEL
Appliances for Installation in solid Fuel burning Fireplaces,
ANS Z21.60-1996 and shall also be installed in accordance with the
National Fuel Gas code, ANS Z223.1-1996.
WARNING: When using a decorative appliance, the
damper must be removed or permanently locked in
the fully open position.
HEARTH EXTENSION
A hearth extension projecting a minimum of 20" in front of and a
minimum of 12" beyond each side of the fireplace opening is
required to protect combustible floor construction in front of the
fireplace, Use a layer of noncombustible, inorganic material having
a thermal conductivity of K=0.64 BTU IN/FT. HR. F (or less) at 1"
thick. Example of determining hearth extension equivalent. If the
material selected has a K factor of 0.25, such as glass fiber, then the
following formula would apply: 0.25/0.64 X 1" = .39" thick. This
must be covered by a noncombustible material such as tile, slate,
brick, concrete, metal, glass, marble, stone, etc. Fasten the hearth
extension to the floor to prevent shifting and seal the gap between the
fireplace frame and hearth extension with a noncombustible material
(see Figure 12).
Insert the gas line parallel to the face. Fill any gap between the gas
line and the hole in the firebrick with refractory cement or commercial furnace cement (see Figure 11B).
OUTSIDE OF
FIREPLACE
GAS LINE
CONDUIT
REPACK
INSULATION
INCOMING
1/2" BLACK
IRON PIPE
SIDE FIREBRICK
FINISHED SIDE
PROVIDE ENOUGH
THREADED END
FOR FITTING
CONNECTION
SEAL OPENING
WITH REFRACTORY
CEMENT
Figure 11B
TEST FOR GAS LEAKS
WARNING: All gas piping and connections must be
tested for leaks after the installation is completed. Be
sure gas valve is turned on. Apply soap suds solution
to all connections and joints. If bubbles appear, leaks
must be detected and corrected. DO NOT use a match
or open flame of any kind to test leaks. Never operate
any appliance with leaky connections.
WARNING: Hearth extension is to be installed only as
illustrated.
HEARTH
EXTENSIONS
NO
STANDARD
HEARTH
RAISED
HEARTH
ELEVATED
FIREPLACE
DO NOT BLOCK
INTAKE GRILL
SEAL GAP
EMBER PROTECTOR
SEAL GAP
EMBER PROTECTOR
Figure 12
DAMPER OPERATION
The damper handle to open and close the damper blade is located inside
the firebox at the center towards the back wall. Pushing the handle back
into the keyway slot will free the damper blade to automatically open.
To close, reach in and push the handle back into the keyhole slot then pull
down and forward to lock it in place (see Figure 13).
The gas pipe is intended for connection to an unvented gas log set or
to a decorative gas appliance.
If you will install an unvented gas log set, ONLY VENTED GAS LOG
SETS WHICH HAVE BEEN FOUND TO COMPLY WITH THE
STANDARD FOR UNVENTED ROOM HEATERS, ANS/IAS/AGA
Z21.11.2, ARE TO BE INSTALLED IN THIS FIREPLACE.
Note:
An appropriate Comfort Glow hood must be installed when
using an unvented gas log set.
WARNING: Do not operate an unvented gas log set in
this fireplace with the chimney removed.
If you will install a decorative gas appliance, the decorative gas
appliance must comply with the Standard for Decorative Gas
55951
TO OPEN
DAMPER
Figure 13
5
COMBUSTIBLE AIR KIT
An Air kit is available for use as an optional accessory. The outside
air vent can be installed through an outside wall or a ventilated crawl
space. Attach flex tube (CLASS 1) to air vent and air inlet tube. Seal
with duct tape (see Figure 14). For air inlet tube installation (see
Figure 15).
WARNING: Air inlet ducts are not to terminate in attic
space or a garage.
Avoid installing outside air eyebrow in areas where inlet opening
may be blocked by snow, bushes or other obstacles. Maximum
height of air inlet above platform of fireplace is within 3 feet below
the termination flue gas outlet.
0" MIN.
0" MIN.
AIR VENT
FLEX TUBE
SEAL WITH
DUCT T APE
OUTSIDE WALL
AIR INLET
TUBE
SEAL WITH
DUCT T APE
AIR INLET
TUBE
AIR VENT
FLEX DUCT
OUTSIDE WALL
Figure 14
SHEET METAL SCREW
REMOVE KNOCKOUT
FIREPLACE
TAB IN NOTCH
AIR INLET TUBE
Figure 15
AIR KIT OPERATION
The damper rod for the air kit is located inside the face opening,
above the upper left top of the rear firebrick. Push the rod up to open
the air intake and down to close it (see Figure 16).
AIR KIT DAMPER ROD
OPEN POSITION
CLOSED POSITION
MANTEL
A mantel may be installed if desired. See Figures 17A or 17B for
minimum heights above and beyond opening of the fireplace face.
Woodwork, such as wood trim and mantels, and other combustible
material, shall not be placed within 6 inches of a fireplace opening.
Combustible material above and projecting more than 1
1
/2 inches from
a fireplace opening shall not be placed less than 12 inches from the top
of the fireplace opening. NFPA STANDARD 211 Section 7-3.3.3.
COMBUSTIBLE
MATERIAL
SAFE ZONE FOR
PROJECTION OF
COMBUSTIBLE
MATERIALS
NOTE:
TO SCALE
UPPER
SECTION OF
FIREPLACE
DRAWING NOT
6"
REF
MINIMUM 12"
12 1/4" REF
33 DEG
9" MINIMUM
3"
NOM
1
1
/2"
MAX
TOP OF
LOUVERED
Figure 17A
TOP VIEW
OUTER SURROUND
COMBUSTIBLE
MATERIALS
3
/
8
1
MAX.
"
2
MIN.
1
/
8
"
SAFE
ZONE
24" MIN. TO
ADJACENT WALL
33°
Figure 17B
FINISHING YOUR FIREPLACE
Wall board (Gypsum board, sheet rock, drywall, etc.) may make
direct contact with sides and top of the fireplace face. It is important
that combustible materials do not overlap the face itself.
Brick, glass, tile or other noncombustible materials may overlap the
front face, provided they do not obstruct essential openings like louvered
slots or any other openings. When overlapping with noncombustible
facing material, use only noncombustible mortar or adhesive.
CAUTION: Do not cover up the face louvers top and
bottom.
Figure 16
REAR FIREBRICK
ASH DISPOSAL
Ashes should be placed in a metal container with a tight-fitting lid.
The closed container of ashes should be placed on a noncombustible
floor or on the ground, well away from all combustible materials,
pending final disposal. If the ashes are disposed of by burial in soil
or otherwise locally dispersed, they should be retained in the closed
container until all cinders have thoroughly cooled.
WARNING: Risk of fire; Replace grate only with DESA
International Model 42E GR grate only.
FUEL: Use seasoned hardwood or if a vent-free or decorative
gas appliance is installed, burn Propane or Natural Gas only.
6
55951
INSTRUCTIONS WHEN OFFSET OF CHIMNEY IS
NEEDED
To Install Elbows
1.To achieve desired offset, you may install combinations of 12",
18", 36", and 48" lengths of double wall pipe (see Offsets andRise chart and Figures 18 and 20).
2.Chimney weight above offset rests on return elbow. Straps must
be securely nailed to rafters or joists (see Figure 19, Details A
and B).
3.Maximum length of pipe between supports (return elbow or
C12S-8DM) is 6’ of angled run. Maximum of two (2) 6’ angled
run sections per chimney system (see Figure 20).
NOTE:
ANY OFFSET GREATER THAN 6 FEET MUST USE A
C12S-8DM, ALSO FOR STRAIGHT RUN OVER 30 FT. LEVEL.