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AIR FOR COMBUSTION AND VENTILATION
Providing Adequate Ventilation
Determining Fresh-Air Flow for Fireplace Location
AIR FOR COMBUSTION AND
VENTILATION
A
WARNING: This fireplace shall not be installed in
a confined space or unusually tight construction
unless provisions are provided for adequate com-
bustion and ventilation air. Read the following in-
structions 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. Nev mate-
rials,
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 antight
as possible.
While it is good to make your home energy efficient
your
home
needs to breathe. Fresh air must enter your borne. All fuel-burning
appliances need fresh air for proper combustion and ventilation.
Exhaust fans, 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 insure proper venting of vented
fuel-burning appliances.
PROVIDING ADEQUATE VENTILATION
The following
are excerpts from
National Fuel Gas Code, ANSI
21223. I/NEPA 54. Section 5.3, Air for Combustion and Ventilation.
All
spaces in homes fall
iron
one of he throe
following ventilation
classifications:
1.
Unusually Tight Construction
2.
Unconfined Space
3.
Confined Space
The information on pages 6 through S
V.
ill help you classify your
space and provide adequate ventilation.
Unusually Tight Construction
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 these three criteria, 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,
proceed to
Determining Fresh-Air Flow For Fireplace
Location, below.
Confined and Unconfined Space
The National Fuel Gus Code. ANSI Z223.1/NEPA 54
defines a
confined space as
a space whose volume is less than 50 cubic feet
per 1,000 Btu per hour (4.8 in' per 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 feet per 1,000 Btu per
hour (4.8 in 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 installed*, through openings not
furnished with doors, are considered a part of the unconfined space.
Adjoining rooms
are communicating only
if there are doorless
passaged\ ays or ventilation grills between them.
DETERMINING FRESH-AIR FLOW FOR
FIREPLACE LOCATION
Determining if You Have a Confined or
Unconfined Space
Use this work sheet
to determine if you
have a confined or unconfined space.
Space:
Inaludes the
MOM
in which you will install
fireplace
plus any adjoinin2
rooms with rloorless passageways or ventilation grills between the rooms.
The
air that leaks around doors and windows may provide enough
I.
1)(2LT111111C the
'olume of the space (length x width x
height))
fresh
air for combustion and vemilation. However, in buildings of
Length
x Width x Height =
cu. ft. (volume otspace)
unusually tight construction, you must provide additional fresh air.
Example:
Space size 16 ft. (length) x
14 P. (width)
S ft. ',Jain)]
Unusually tight construction is defined
as construction
height I =
1792 en tt. (volume
of space)
where:
If additional ventilation to achommic
10011115
supplied with
grillsoropen-
a.
walls and ceilings exposed to the outside atmosphere
ings, add the volume of these rooms
to die
total volume
of the space
have a continuous water vapor retarder with a
rating
2
Nlutuplv the space volume by 20 to
determine
the maximum Btuil In
of one perm (6 x 1 0 - " kg
per pa-sec-in') or less with
thc spnce can support.
openings
gasketed or sealed
and
volurnc
of space)
\ 20 = (Maximum Btud
-
ir the spice
b.
weather
stripping has been added on openable win-
can support)
dows and doors
and
Example:
1792
Cu. ft. (volume of space) x 20 4
35,840 (maximum
13tull hr the space can support)
For more informaitioni`',
4 1 . ,,t
:J sfr 31.1
(J,L:1)11J
107032-01J
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