36
Rev. 2
COMBUSTION AND VENTILATION AIR
Equipment Located in Confined Spaces; All Air from
Inside Building. 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.
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. The following drawing illustrates
the air opening specifications for equipment located in con-
fined spaces; all air from outdoors-inlet air from ventilated
crawl space and outlet air to ventilated attic.
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. The following drawing
illustrates the air opening specifications for equipment
located in confined spaces; all air from outdoors through
ventilated attic.
Equipment Located in Confined Spaces; All Air
from Outdoors Through Ventilated Attic.
See 5.3.3-b.
3. When communicating with the outdoors through hori-
zontal 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. The fol-
lowing drawing illustrates the air opening specifications
for equipment located in confined spaces; all air from
outdoors.
*If the appliance room is located against an outside wall and the air openings communicate directly
with the outdoors, each opening shall have a free area of not less than one square inch per 4,000
BTU per hour of the total input rating of all appliances in the enclosure.
Equipment Located in Confined Spaces; All Air
from Outdoors. See 5.3.3-b.
4. When ducts are used, they shall be of the same cross-
sectional area as the free area of the openings to which
they connect. The minimum dimension of rectangular
air ducts shall not be less than 3 inches.
Содержание GCIA045A30
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