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Installation
Instructions
(cont'd)
Facts to Consider About the
Location (cont'd)
Combustion
Air and
Ventilation
for Appliances
Located in Unconfined Spaces
®
Unconfined
Space
is a space whose volume is not less than 50
cubic feet per 1,000 Btu per hour 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
Figure
2 ]
ROOM INSTALLATION
(ACCEPTABLE)
A room is any enclosure
which
is at least 16" times
greater than the total volume of all the gas fired appli-
ances within the enclosure.
In unconfined spaces in buildings, infiltration may be adequate
to provide air for combustion, ventilation and dilution of flue
gases. However, in buildings of tight construction (for example,
weather stripping, heavily insulated, caulked, vapor barrier, etc.),
additional
air may need to be provided using the methods
described in Combustion
Air and Ventilation for Appliances
Located in Confined Spaces, b.
WATER
HEATER
I Figuro 3 I
ALCOVE INSTALLATION
(ACCEPTABLE)
An alcove suitable for the installation of a water heater is a
restricted section of a room not separated from the room
by a door or partition
and which
meets the minimum
clearances
for the specific
model
water heater listed
below.
*When the ceiling
height exceeds 8 feet, you are only
allowed to consicTer 8 _'eetwhen calculating the total vol-
ume of the enclosure.
12" MAX.
-
r_
t
VENTILATION
AIR
OPENINGS
C
DOOR
FRONT
VIEW
_
3"MIN.
OF DOOR
AIR DUCT
IFig-ro4]
[Flguro51
AWARNING
Minimum
clearances
between
the water
heater
and
combustible
construction
are listed below:
Minimum
Side & Rear Clearances
--
I"
Minimum
front clearance from jacket to closet door _ 4"
Minimum
ceiling
clearance
from
jacket
top to com-
bustible ceiling-
18".
It
Combustion Air and
Ventilation for Appliances
Located in Confined Spaces
Confined
Space
is a space whose volume is less than 50 cubic
feet per 1,000 Btu per hour of the aggregate input
rating of all
app]iances
installed in that space.
ao
ALL AIR FROM
INSIDE
BUILDINGS:
(See Figures l through
6)
The confined
space shall be provided
with two permanent
openings
communicating
directly with an additional
room(s)
of sufficient
volume
so that the combined
volume
of all
spaces meets the criteria for an unconfined
space. The total
input
of all gas utilization
equipment
installed
in the com-
bined space shall be considered
in making this determination.
Each opening
shall have a minimum
free area of one square
inch per 1,000 BTU per hour of the total input
rating of all
gas utilization
equipment
in the confined
space, but not less
than 100 square inches. One opening
shall commence
within
12 inches of the top and one commencing
within
12 inches
of the bottom
of the enclosure.
Figure 6 ]
SVENT
FURN
OPENINGS
A _Z] WA
I I
I _._ER _
b. ALL AIR FROM
OUTDOORS:
(see Figures 7 through 9,
page 12)
The confined
space shall be provided
with two permanent
openings,
one commencing
within
12 inches of me top and
one commencing
within
12 inches from the bottom
of the
enclosure.
The openings
shall communicate
directly, or by
ducts, with the outdoors
or spaces (crawl or attic) that freely
communicate
with the outdoors.
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