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OWNER'S
MANUAL
AIR FOR
COMBUSTION
AND
VENTILATION
_,
WARNING: This heater shall
not be installed
in a confined
space
or unusually
tight con-
struction unless provisions are
provided for adequate combus-
tion and ventilation air. Read the
following
instructions
to insure
proper fresh sir 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 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/ANS 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 5 through 7 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
buildings of unusually tight construction,
you must provide additional fresh air.
Unusually tight construction
Is de-
fined as construction where:
a.
walls and ceilings expoeed to the
outside atmosphere have a con-
tinuous water vapor retarder with
a rating of one perm (6 x 10-11kg
per pa-sec-nd) 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 st other openings.
If your home meets ell of the three
criteria above, you must provide ad-
ditional fresh air. See Ventilation Air
From Outdoors, page 7.
If your home does not meet all of the
three criteria above, proceed to Deter-
mining Fresh-Air Flow For Fireplace
Location, page 6.
Confined
and Unconfined
Space
The National Fuel Gas Code (ANS Z223.1,
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 m 3per
kw) of the aggregate input rating of all
appliances installed in that space and an
unconfining space as a space whose volume
is not less than 50 cubic feet per 1,000 Btu
per hour (4.8 m3 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.
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
if there are doorless passageways or ventila-
tion grills between them.
Continued
105617
5
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