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FRESH AIR FOR
COMBUSTION AND
VENTILATION
WARNING: This heater
shall not be installed in a
confined space or unusually
tight
construction
provisions are provided for
adequate
combustion
v e n t i l a t i o n
a i r .
R e a d
f o l l o w i n g
i n s t r u c t i o n s
insure proper fresh air for this
and
other
fuel-burning
appliances in your home.
PROVIDING ADEQUATE
VENTILATION
The following are excerpts from
National Fuel Gas Code. NFPA
54/ANS Z223.1, Section 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.
DETERMINING FRESH-AIR FLOW FOR HEATER LOCATION
Determining if you Have a Confined or Unconfined Space*
Use this worksheet to determine if you have a confined or unconfined space.
Space: Includes the room in which you will install heater plus any adjoining rooms with doorless passageways
or ventilation grills between the rooms.
1. Determine the volume of the space (length
×
×
Length
Width
Height=
Example: Space size 20ft. (length)
If additional ventilation to adjoining room is supplied with grills or openings, add the volume of these
rooms to the total volume of the space.
2. Divide the space volume by 50 cubic feet to determine the maximum Btu/Hr the space can support.
(volume of space)
Example: 2560 cu. ft. (volume of space)
WARNING: If the area in which the heater may be operated is smaller than that defined as an
unconfined space or if the building is of unusually tight construction, provide adequate combustion and ventilation
air by one of the methods described in the National Fuel Gas Code, ANS Z223.1, Section 5.3
or applicable local codes.
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
tight construction, you must provide
additional fresh air.
Unusually tight construction is
unless
defined as construction where:
a. walls and ceilings exposed to the
and
outside atmosphere have a
t h e
tinuous water vapor retarder with a
t o
rating of one perm (6
p a - s e c - m
2
)
openings gasketed or sealed and
b. weather
added on openable windows and
doors and
c. caulking or sealants are applied to
areas such as joints around
dow and door frames, between sole
plates and floors, between
ceiling joints, between wall panels, at
penetrations for plumbing, electrical,
and gas lines, and at
openings. If your home meets all of
the three criteria above, you must
provide additional fresh air. See
Ventilation Air From Outdoors,
page 5 and 6.
If your home does not meet all of
the
three
Determining Fresh-Air Flow for
Heater Location, page 4, 5.
×
width
cu.ft. (volume of space)
×
×
16ft( width)
50 cu. ft.=(Maximum Btu/Hr the space can support)
50 cu.ft.=51.2 or 51,200(maximum Btu/Hr the space can support)
Confined and
Unconfined Space
The National Fuel Gas Code
ANS Z223.1 defines a confined
space as a space whose volume
is less than 50 cubic feet per
1,000 Btu per hour (4.8 m
of the aggregate input rating of all
appliances installed in that space
and an unconfined space as a
con-
space whose volume is not less
than 50 cubic feet per 1,000 Btu
×
10
-11
kg per
per hour (4.8 m
o r
l e s s
w i t h
aggregate input rating of all
appliances installed in that space.
stripping
has
been
Rooms communicating directly
with the space in which the
appliances are installed*, through
openings not furnished with
win-
doors, are considered a part of
the unconfined space.
wall-
This heater shall not be installed
in a confined space or unusually
t i g h t
other
provisions are provided for
adequate
ventilation air.
*
communicating only if there are
d o o r l e s s
ventilation grills between them.
above, see
criteria
×
height).
8ft. (ceiling height)=2560cu. ft. (volume of space)
4
3
per kw)
3
per kw) of the
c o n s t r u c t i o n
u n l e s s
combustion
and
A d j o i n i n g
r o o m s
a r e
p a s s a g e w a y s
o r
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