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11
WARNING
Failure to supply adequate air to the boiler will
result in unsafe boiler operation.
C. PROVIDE AIR SUPPLY AND VENTILATION to
accommodate proper combustion.
For commercial and industrial equipment, permanent
facilities for supplying an ample amount of outside air
shall be provided in accordance with the following.
For boiler rooms adjacent to outside walls, and where
combustion air is provided by natural ventilation from
the outside, there shall be a permanent air supply inlet
having a total free area of not less than 1 sq. inch per
4,000 Btu per hr. (35 sq. inch per gallon per hour)
(5.5 cm
2
per kw.) of total input rating of the burner or
burners and in no case less than 35 sq. inch (0.425m
2
).
For boiler rooms not adjacent to outside walls, the
combustion air shall be supplied in a manner acceptable
to the authority having jurisdiction.
1. In the absence of local requirements, the conned
space shall be provided with two permanent
openings, one in or near the top of the room and one
near the bottom. The openings shall communicate
by means of ducts, with the outdoors or to such
spaces (crawl or attic) that communicate with the
outdoors.
a. Where communicating by means of vertical
ducts, each opening shall have a free area of not
less than 1 sq. inch per 4,000 Btuh (35 sq. inch
per gph) (5.5 cm
2
per kw) of total input rating of
all appliances in the enclosure.
b. If horizontal ducts are used, each opening shall
have a free area of not less than 1 sq. inch
per 2,000 Btuh (70 sq. inch per gph.) (11 cm
2
per kw) of total input of all appliances in the
enclosure.
D. CHIMNEY OR VENT
NOTICE
When a V9A gas red boiler is connected to
a venting system that is designed so that it
will operate under a negative pressure, the
use of Type C, B, or other manufactured vent
systems designed for negative pressure is
acceptable.
When a V9A oil red or combination gas/oil
red boiler is connected to a venting system
that is designed so that it will operate under
a negative pressure, the use of Type C, L or
other manufactured vent systems designed
for negative pressure is acceptable.
Unlined masonry chimneys are not accept-
able. Lined masonry chimneys are acceptable
with the appropriate vent connectors using
materials described above.
Figure 2: Boiler Foundation