COMBUSTION AIR REQUIREMENTS
(Minimum Square Inches Requirement)
i iii ,ii!o iiiB
15045 I00 10 I3 25
15070 I00 15 I9 38
15096 I00 20 25 50
15120 I25 25 32 63
15145 I50 30 38 75
15175 I75 35 44 88
15195 200 40 50 I00
15245 250 50 63 I25
15295 300 60 75 150
* A space whose volume is not less than 50 cubic feet per 1000 BTU per hour of all
appliances installed in that space (cubic feet of space = height x width x length)
** A space whose volume is less than 50 cubic feet per 1000 BTU per hour of a!t
appliances installed in that space (cubic feet of space = height x width x length)
1. Ventilation of the boiler room must be adequate to
provide sufficient air to properly support combustion
per the latest revision of the National Fuel Gas Code,
ANSI Z223.1 section 5.3.
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i3
I FIGURE 1 !
2. When a boiler is located in an unconfined space in a
building or conventional construction frame, masonry
or metal building, infiltration normally is adequate to
provide air for combustion and ventilation. However,
if the equipment is located in a building of unusually
tight construction (See the National Fuel Gas Code,
ANSI Z223.1 section 1.7), the boiler area
should be considered as a confined space.
In this case air for combustion and ventilation
shall be provided according to Step 5. Ifthere
is any doubt, install air supply provisions in
accordance with the latest revision of the
National Fuel Gas Code.
3. When a boiler is installed in an unconfined
space in a building of unusually tight
construction, air for combustion and
ventilation must be obtained from outdoors
or from spaces freely communicating with the
outdoors. A permanent opening or openings
having a total free area of not less than 1
square inch per 5000 BTU per hour of total
input rating of all appliances shall be provided.
Ducts may be used to convey makeup air
from the outdoors and shall have the same
cross-sectional area of the openings to which
they are connected.
4. When air for combustion and ventilation is from
inside buildings, the confined space shall be provided
with two permanent openings, one starting 12 inches
from the top and one 12 inches from the bottom of the
enclosed space. Each opening shall have a minimum
free area of I square inch per 1000 BTU per hour of
the total input rating of all appliances in the enclosed
space, but must not be less than 100 square inches.
These openings must freely communicate directly
with other spaces of sufficient volume so that the
combined volume of all spaces meets the criteria
for an unconfined space. (Figure 1)
5. When the boiler is installed in a confined space
and all air is provided from the outdoors the confined
space shall be provided with one or two permanent
openings according to methods A or B. When ducts
are used, they shall be of the same cross sectional
area as the free area of the area of the openings
to which they connect. The minimum dimension of
rectangular air ducts shall be not less than 3 x 3
inches or 9 square inches.
A. When installing two openings, one must
commence within 12 inches from the top and
(48 Seiten)
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