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AIR
FOR
COMBUSTION
AND
VENTILATION
WARNING
This heater
must have fresh air for proper
operation.
If not, poor
fuel combustion
could
result.
Read the following
instructions
to
insure
proper fresh
air for this and other
fuel-burning
appliances
in your home.
Today's homes are built more energy efficient than ever. New materials, increased
insulauon, 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 fue!-bummg appliances need fresh air for proper
combustion and ventilation•
Exhaustfans,
fireplaces,
clothes dryers,
and fuel
burning appliances
draw air from
the house to operate. You must provide adequate fresh air for these appliances, This
will iusure proper venting of vented fuel-burning appliances.
PROVIDING ADEQUATE VENTILATION
The following is exerpted from National Fuel Gas Code, NFPA 54/ANSI Z223.1,
•
w
....
n
Section 5.3, Azr for Combustion and Ventilation .
All spaces in homes fall into one of the three following ventilation classifications:
1. Unusually Tight Contruction; 2. Unconfined Space; 3. Confined Space.
The information on pages 5 through 8 will help you classify your spa_:e and provide
adequate ventilation.
Unusually Tight Construction
The air that leaks around doors and windows may provide enough fresh air for
combustion and,ventilation. However, in buildings of unusually fight cousWactiou,
you must provide additional fresh air.
Unusually tight construction
is defined as construction where:
a. walls and ceilings exposed to the outside atmosphere have a
continuous
water vapor retarder with a rating of one perm or less
with openings gasketed or sealed and
b. weather stripping
has been added on openahle windows and
doors and
c. caulking
or sealants
are applied
to areas such as joints around
window and door frames, between sole plates and floors, between
wall-ceiling
joints,
between
wall
panels,
at
penetrations
for
plumbing, electrical, and gas lines, and at other openings.
If your home meets all of the three criteria above, you must provide
additional fresh air. See Ventilation Air From Outdoors, page 8. If your
home does not meet all of the three criteria above, continue reading.
Confined
Space
and
Unconfined
Space
This heater
shall not he iustalled
in a toni'meal space unless provisions
_e provided
for
adequate
ct)ulbustion
mid ventilation
air.
The National
Fuel Gas Code delines
a conlincxl
space its a space whose volume is less
than 50 cubic feet per 1,000 Btu per hour (4.8
m 3 per
kw) ol lilt2
aggregate input rating
Continued
!
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