Desa VPN36 3-SIDED - Manual (Page 6)

6 55505
Figure 10
If a hearth extension is to be field constructed, it must be made of
noncombustible, inorganic material having an effective thermal
conductivity "K" of .84 BTU In/Ft 2 Hr. F or less at 1" thickness.
Thermal conductivity "K" of materials can be obtained from the
manufacturer.
The minimum required thickness for any material could be obtained
by the following formula:
K factor x 1" = Thickness required
.84
If the hearth extension is to be raised, a "Z" type metal safety strip
must be used, see Figure 7, page 5 and Figure 11.
OUTSIDE AIR KIT INSTALLATION
The installation of the outside air kit must be installed during the
rough framing of the firebox due to the nature of its location. Outside
combustion air can be accessed through an exterior wall or a vented
crawl space (see Figure 12).
WARNING: AIR INLET DUCTS MUST NOT TERMI-
NATE IN ATTIC SPACE.
Avoid installing outside air eyebrow in areas where inlet opening
may be blocked by snow, bushes or other obstacles. It should also be
located beyond the reach of small children.
The maximum height for the air inlet above platform of firebox is
within 3 feet below the termination flue gas outlet.
For further details on the installation of the outside air kit, please
refer to the instructions included with the kit. For operating instruc-
tions, please refer to your owner’s manual.
GAS LINE INSTALLATION
YOUR GAS SUPPLIER OR A QUALIFIED SERVICE PER-
SON SHOULD DO GAS LINE HOOKUP.
WARNING: BEFORE YOU PROCEED, MAKE SURE
YOUR GAS SUPPLY IS OFF!
A gas line may be installed for the purpose of installing a 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.
STEP 1: To install, remove the knockout indentation on the refrac-
tory (or firebrick) wall located approximately 2" above the refractory
hearth floor. The knockout indentation must be firmly tapped with
any solid object until it is released. Remove fragmented portion of
refractory (see Figure 13, page 7).
Figure 11
NONCOMBUSTIBLE
HEARTH EXTENSION
64 MIN.
20
MIN.
16
MIN.
65 MIN.
NONCOMBUSTIBLE
HEARTH EXTENSION
NONCOMBUSTIBLE
HEARTH EXTENSION
8" MAX
"Z" TYPE
EMBER PROTECTOR
EMBER PROTECTOR
FOR RAISED FIREPLACE SEE SECTION
ON FRAMING WITH A RAISED PLATFORM
1 1 / 2 " TYP
1 1 / 2 " TYP
"K" FACTOR
.84
SECURE TO
COLLARS WITH
DUCT TAPE OR
SCREWS
VENTED CRAWL
SPACE INSTALLATION
CHECK WITH LOCAL AREA CODES PRIOR TO
INSTALLING IN A VENTED CRAWL SPACE
AIR INLET
EYEBROW
AIR INLET
LOCATION
MUST ALLOW
FOR BUSHES
OR SNOW
Figure 12