4
105647
UNVENTED NATURAL GAS FIREPLACE INSERT
DESA INTERNATIONAL
For more information, visit www.desatech.com
AIR FOR
COMBUSTION AND
VENTILATION
Today’s homes are built more energy effi-
cient than ever. New materials, increased
insulation, and new construction methods
help reduce heat loss in homes. Home owners
weather strip and caulk around windows and
doors to keep the cold air out and the warm air
in. During heating months, home owners
want their homes as airtight as possible.
While it is good to make your home energy
efficient, your home needs to breathe. Fresh
air must enter your home. All fuel-burning
appliances need fresh air for proper com-
bustion and ventilation.
Exhaust fans, fireplaces, 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.
PROVIDING ADEQUATE
VENTILATION
The following are excerpts from National
Fuel Gas Code NFPA 54/ANSI Z223.1, Sec-
tion 5.3, Air for Combustion and Ventilation.
All spaces in homes fall into one of the three
following ventilation classifications:
1. Unusually Tight Construction
2. Unconfined Space
3. Confined Space
The information on pages 4 through 6 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
Confined and Unconfined Space
The National Fuel Gas Code ANSI Z223.1/
NFPA 54 defines a confined space as a
space whose volume is less than 50 cubic
feet per 1,000 Btu per hour (4.8 m
3
per kw)
of the aggregate input rating of all appli-
ances installed in that space and an uncon-
fined space as a space whose volume is not
less than 50 cubic feet per 1,000 Btu per
hour (4.8 m
3
per kw) of the aggregate input
rating of all appliances installed in that
space. Rooms communicating directly with
the space in which the appliances are in-
stalled*, through openings not furnished
with doors, are considered a part of the
unconfined space.
* Adjoining rooms are communicating only
if there are doorless passageways or ventila-
tion grills between them.
PRODUCT
FEATURES
OPERATION
This vent-free fireplace insert is clean burn-
ing. It requires no outside venting. There is no
heat loss out a vent or up a chimney. Heat is
generated by both realistic flames and glow-
ing embers. When used without the blower,
the fireplace insert requires no electricity
making it ideal for emergency backup heat.
SAFETY DEVICE
This fireplace insert has a pilot with an
Oxygen Depletion Sensing (ODS) safety
shutoff system. The ODS/pilot is a required
feature for vent-free room heaters. The ODS
system shuts off the fireplace insert if there
is not enough fresh air.
PIEZO IGNITION SYSTEM
This fireplace insert has a piezo ignitor. This
system requires no matches, batteries, or
other sources to light fireplace insert.
BLOWER ASSEMBLY
This fireplace insert is equipped with a
blower assembly. The blower operates
thermostatically and has a variable control.
The blower circulates heated air from the
fireplace insert into the room. Use of blower
is optional.
WARNING: This heater shall
not be installed in a confined space
or unusually tight construction
unless provisions are provided
for adequate combustion and ven-
tilation air. Read the following in-
structions to insure proper fresh
air for this and other fuel-burning
appliances in your home.
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-m
2
) 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-
tions for plumbing, 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 6.
If your home does not meet all of the
three criteria above, proceed to
Deter-
mining Fresh-Air Flow for Fireplace
Location on page 5.
