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WARNING: All gas piping and connections must be
tested for leaks after the installation is completed. Be
sure gas valve is turned on. Apply soapsuds 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 for leaks. Never
operate any appliance with leaky connections.
WARNING: WHEN USING A DECORATIVE APPLI-
ANCE THE DAMPER MUST BE REMOVE OR PERMA-
NENTLY LOCKED IN THE OPEN POSITION.
HEARTH EXTENSION
A hearth extension projecting a minimum of 16 inches in front of and
a minimum of 8 inches beyond each side of the firebox opening is
required to protect combustible floor construction in front of the
firebox. Use a layer of noncombustible inorganic material having a
thermal conductivity of K=0.84 BTU IN/FT. SQ. HR F (or less) at
1" thick. For example, if the material selected has a K Factor of 0.25,
such as glass fiber, then the following formula would apply 0.25/
0.84 x 1"=. 30 thick. This must be covered by any 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 firebox frame and hearth extension with
a noncombustible material (see Figure 16).
HEARTH
EXTENSIONS
STANDARD
HEARTH
RAISED
NO
HEARTH
ELEVATED
FIREPLACE
Figure 16
WARNING: HEARTH EXTENSION IS TO BE IN-
STALLED ONLY AS ILLUSTRATED.
FIREPLACE
SIDE FRAME
NORMAL FRAMING
PACK
INSULATION
HERE
WIDE FRAMING
Figure 17
SEAL GAP
EMBER PROTECTOR
DO NOT BLOCK
INTAKE GRILL
SEAL GAP
EMBER PROTECTOR
SIDE
FRAMING
3/4 CLEARANCE
NOT REQUIRED
AT THE FRAMING
CAULK HERE
SIDE
FRAMING
FIREPLACE
SIDE FRAME
FIREBOX ENCLOSURE - COLD WEATHER
CLIMATE
Before finishing the enclosure around the firebox, inspect all joints
around the firebox. Any gaps between the nailing flanges and the
framing should be sealed with noncombustible insulation or caulk-
ing. Inspect the firebox joint for possible gaps caused by shipping or
mishandling during installation. These should be sealed with non-
combustible materials. If the firebox is mounted on a raised platform,
insulate below the platform to prevent the entry of cold air through
the firebox bottom by means of conduction. The above steps are
important, especially if the firebox is installed in cold weather
climate, (see Figure 17).
COMBUSTIBLE AIR KIT (MODEL VAK-4E)
An air kit is available for use with model 36EC2 firebox as an
optional accessory. The outside air vent can be installed through an
outside wall or a ventilated crawl space. A plaster ground is provid-
ing for use on unfinished walls prior to applying finish surface.
Attach flex tube to air vent and air inlet tube. Seal with duct tape (see
Figure 18).
SEAL WITH
DUCT TAPE
AIR INLET
TUBE
SEAL WITH
DUCT TAPE
FLEX DUCT
OUTSIDE
WALL
AIR KIT INSTALLATION
Figure 18
CAUTION: AIR INLET DUCTS ARE NOT TO TERMI-
NATE IN ATTIC SPACE.
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 firebox is within 3 feet below the
termination exhaust height.
SHEET METAL SCREW
REMOVE KNOCKOUT
FIREPLACE
TAB IN NOTCH
Figure 19
BLOWER ASSEMBLY - VCBK3
A blower assembly is available for use with this firebox as an optional
accessory. It is designed to be installed on Vanguard factory pre-wired
firebox only. The optional blower assembly model VCBK3 can be
installed prior to, or after installation of the firebox. Use of blowers or
fans other than those manufactured by DESA International voids the
warranty. A switch located on the lower face operates the optional
blower. Flipping the switch turns the blower on or off.
6
AIR VENT
FLEX DUCT
AIR INLET
TUBE
AIR INLET TUBE
55504
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