Amana AIR COMMAND 80 - Page 5

( ea While
all
forms
of building construction cannot be covered
in detail, air
for combustion,
ventilation and dilution of flue
gases
for gas utilization equipment
vented by
natural draft
normally may
be
obtained by
application
of one of the meth-
ods
covered in 5.3.3 and 5.3.4.
(f) Air
requirements for
the operation of exhaust fans, kitchen
ventilation systems, clothes dryers, and fireplaces
shall
be
considered in determining
the
adequacy of a space to
pro-
vide
combustion air
requirements.
5.3.2 Equipment Located in
Unconfined Spaces:
In
uncon-
fined spaces in buildings infiltration may be
adequate
to pro-
vide
air for combustion, ventilation, and dilution of
flue gases.
However, in buildings
of unusually
tight construction addi-
tional air shall be provided using the methods
described
in
5.3.3-b or 5.3.4.
Space, Unconfined.
For
purposes
of
this Code, 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 uncon-
fined space.
5.3.3 Equipment
Located in
Confined Spaces:
(a)
All
Air
from
Inside the
Building:
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 equip-
ment installed in the combined space shall
be considered
in
making this
determination.
Each opening shall have
a
mini-
mum free area of 1 square inch per
1,000 Btu
per
hour of the
total
input
rating
of all gas utilization
equipment
in
the con-
fined space, but not less than 100
square inches. One open-
ing shall be within 12 inches of the
top and one within 12
inches
of
the bottom of the enclosure.
(See Figure
1.)
CHIMNEY or
GAS
VENT
OPENINGS
Note: Each opening
shall
have a
free area
of
not less than
one square
inch per
1,000
Btu
per
hour of
the total
input
rat-
ing of all
equipment in the
enclosure, but not
less
than
100 square
inches.
Fig. 1.
Equipment Located
in
Confined Spaces;
All Air from inside
the Build-
ing. See
5.3.3-a.
(b)
All Air From
Outdoors: The confined
space
shall
be pro-
vided
with
two permanent openings, one commencing
within
12 inches of the top
and one
commencing within 12
inches of
the bottom of the
enclosure.
The openings shall communi-
cate
directly, or by
ducts, with the outdoors
or
spaces (crawl
or
attic)
that freely
communicate with the outdoors.
y ,
1. When directly
communicating with
the
outdoors, each
opening shall
have a
minimum
free area of
1
square
inch
per
4,000 Btu
per hour of
total
input
rating of all equip-
ment in the enclosure. (See Figure 2.)
CHIMNEY or
GAS VENT
VENTILATION
LOUVERS
(each
end
of
attic)
ALTERNATE
AIR INLET
VENTILATION
LOUVERS
FOR
UNHEATED CRAWL
SPACE
Note:
The
inlet and out-
let
air openings
shall
each have a free
area of
not less
than
one square
inch
per
4,000 Btu
per
hour of
the
total
input rat-
ing of all equipment
in
the
enclosure.
Fig. 2.
Equipment Located
in
Confined
Spaces;
All Air from
Outdoors — Inlet
Air
from Ventilated Crawl
Space and Outlet
Air
to Ventilated Attic. See
5.3.3-b.
2.
When communicating
with
the outdoors through vertical
ducts, each opening
shall have a
minimum free area of 1
square inch per 4,000 Btu per
hour of total
input rating of
all
equipment in the
enclosure.
(See Figure 3.)
CHIMNEY or
GAS VENT
VENTILATION
LOUVERS
leach
end
of
attic)
Note: The inlet and out-
let air
openings shall
each
have a
free area of
not less than
one
square
inch per
4,000
Btu
per
hour of
the total
input rat-
ing of all
equipment in
the
enclosure.
INLET AIR DUCT
(ends
1 ft.
above
floor)
Fig. 3.
Equipment
Located
in Confined
Spaces; All Air from
Outdoors
Through ventilated Attic. See 5.3.3-b.
3. When
communicating with
the outdoors through horizon-
tal
ducts,
each
opening shall
have a minimum free area
of 1
square inch per
2,000 Btu per
hour
of total input
rating of all
equipment in the
enclosure. (See Figure
4.)
4. When ducts
are used, they shall be of the same crosssec-
tional area as
the free area
of
the openings to which they
connect. The minimum dimension of rectangular air
ducts
shall
be
not
less than 3
inches.
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