BLUE FLAME NATURAL GAS HEATER
FRESH AIR FOR
COMBUSTION AND
VENTILATION
_WARNING: This heater shall
not be installed in a Confined
space unless provisions are pro-
vided for adequate combustion
and ventilation air. Read the fol-
lowing instructions to Insure
proper fresh air for this and other
fuel-burning appliances In your
home.
Today's homes are built more energy effi-
cient than ever. New materials, increased
insulation, and new construction methods
help reduce beat loss in homes. Home owners
weather strip and caulk around windows and
doors tokeep the cold air outand 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 is exerpts from National Fuel
Gas Code. NFPA 54/ANSI Z223.1, Section
5.3, Air for Combustion and Ventilation.
All spaces inhomes fallinto one ofthe three
following ventilation classifications:
1. Unusually Tight Contruction
2. Unconfined Space
3. Confined Space
The information on pages 4through 6will
help you classify your space and provide
adequate ventilation.
Unusually Tlght 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"11kg
per pe.seo.n_) or less with open-
ings gasketed or sealedand
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-
twsen 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 De-
termining Fresh-Air Flow For Heater
Location, page 5.
Confined and Unconfined Sp_e
TheNationalFuelGasC-ode(ANSIZ223.1,
1992 Section 5.3) defines a confined space
as a space whose volume is less than 50
cubic feet per 1,000 Btu per hour (4.8 m3per
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 feel per 1,000 Btu
per hour (4.8 m3per kw) of the aggregate
input rating of all appliances installed inthat
space. Rooms communicating directly with
the space in which the appliances are in-
stalled*, through opemngs not furnished
with doors, are considered apart of the
unconfined space.
This heater shall not be installed in a con-
fined space or unusually tight construction
unless provisions are provided for adequate
combustion and ventilation air.
*Adjoining rooms are communicating only
ifthere aredoorless passageways orventila-
tion _511Sbetween them.
4Io433!
