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6
DETERMINING FRESH-AIR FLOW
FOR APPLIANCE LOCATION
Determining if You Ha
ve a Confined
or Unconfined Space
Use this work sheet to determine if you have a
confined
or unconfined space.
Space:
Includes the room in which you will install
appli
-
ance
plus
any adjoining rooms with doorless
passageways
or ventilation grills between the rooms.
1.
Determine the volume of the
space
(length x width x
height).
Length x Width x Height =
cu. ft. (volume of space)
Example: Space
size 22
ft.
(length) x 18
ft.
(width) x
8 ft. (ceiling height) = 3168 cu. ft. (volume of space)
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.
Multi
p
ly the s
p
ace volume by 20 to determine the maxi-
mum Btu/Hr the space can support.
_______ (volume of s
p
ace) x 20 = (Maximum Btu/Hr
the s
p
ace can s
upport
)
Example: 3168 cu.
ft
.
(volume of s
p
ace) x 20 =
63,360
(maximum Btu/Hr t
he space
can s
upp
ort)
3.
Add the Btu/Hr of all fuel burning
appliances
in the
space.
Vent-free log set _______________ Btu/Hr
Gas water heater* ______________ Btu/Hr
Gas furnace ___________________ Btu/Hr
Vented gas heater ______________ Btu/Hr
Gas fireplace logs
______________ Btu/Hr
Other gas appliances*
+ ________ Btu/Hr
Total = ________ Btu/Hr
* Do not include direct-vent gas
app
lian
ces.
Direct-vent
draws combustion air from the outdoors and vents to
the outdoors.
Example:
Vent-free log set ______________ Btu/Hr
Gas water heater* _____________ Btu/Hr
Total = ________ Btu/Hr
4.
Com
p
are the maximum Btu/Hr the
space
can
supp
ort with
the actual amount of Btu/Hr used.
____
Btu/Hr (max. the space can support)
____
Btu/Hr (actual amt. of Btu/Hr used)
Example: 63,300
Btu/Hr (maximum the
space
can
sup
-
port)
73,000 Btu/Hr (actual amount of Btu/Hr used)
The
space
in the above
example
is a
confined space
because
the actual Btu/Hr used is more than the maximum Btu/Hr
the
space
can
support.
You must
provide
additional fresh
air. Your options are as follows:
A.
Rework work sheet
,
adding the s
p
ace of an adjoining room
.
If the extra
space provides
an
unconfined space,
remove
door to adjoining room or add ventilation grills between
rooms. See
Ventilation Air from Inside Building
, page 5.
B.
Vent room directly to the
outdoors.
See Ventilation Air
from Outdoor
s, page 5.
C.
Install a lower Btu/Hr
appliance,
if lower Btu/Hr size
makes room unconfined.
If the actual Btu/Hr used is less than the maximum Btu/Hr
the
space
can
support,
the
space
is an
unconfined space.
You will need no additional fresh air ventilation.
39,000
40,000
79,000
AIR FOR COMBUSTION
AND VENTILATION
WARNING: If the area in which the
heater may be
operated does
not meet the
required
volume for
indoor
comb
ustion
air, comb
ustion and
ventilation air
shall
be
p
ro
vided
by one of the
methods described
in the National Fuel Ga
s
Co
de
, ANSI Z223.1/
NFPA 54, the International Fuel
Gas Code,
or applica
b
le local codes.
CONTINUED