BOILER BOOK CFC-E ENGINEERING DATA
37
Figure 29. One Opening Method
Unconfined Space/Engineered Design
When determining boiler room air requirements for unconfined space, the size of the room, airflow,
and velocity of air must be reviewed as follows:
1. Size (area) and location of air supply openings in the boiler room.
A. Two permanent air supply openings in the outer walls of the boiler room are recommended.
Locate one at each end of the boiler room, preferably below a height of 7 feet. This allows air
to sweep the length of the boiler. See Figure 30.
B. Air supply openings can be louvered for weather protection, but they should not be covered
with fine mesh wire, as this type of covering has poor air flow qualities and is subject to
clogging with dirt and dust.
C. A vent fan in the boiler room is not recommended, as it could create a slight vacuum under
certain conditions and cause variations in the quantity of combustion air. This can result in
unsafe burner performance.
D. Under no condition should the total area of the air supply openings be less than one square
foot.
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