BIG ASS FANS Powerfoil X3.0 Plus Installation Manual page 16

Understanding airflow patterns
Correct fan placement is crucial for maximizing airflow distribution while adhering to safety standards.
Airflow in an open area
The airflow moves from the fan toward the floor.
When airflow hits the floor, it moves outward in
all directions. The deflection of air off the floor is
called a "floor jet."
Airflow in an enclosed area
The floor jet radiates outward until it reaches the
walls, which deflect the jet upward to the ceiling.
Upward flow is directed inward to the low pressure
area above the fan where it is then pulled down
toward the floor. This creates a convection-like air
current that gathers momentum. Once this current
is established, the fan begins to move air outside
the current, escalating its cooling effects.
Airflow with multiple fans
Where there are multiple fans appropriately
spaced, the expanding jets of adjacent fans meet
to create a pressure zone. The pressure zone
acts like a wall, causing each fan to behave like
a single enclosed fan. Typically, a single fan's
performance will increase when working in
conjunction with other fans.
Airflow with streamlined obstruction
Obstructions on the floor tend to block the
horizontally moving air. Thin or streamlined
obstructions do not block much airflow, regardless
of size. The air tends to flow smoothly around
these obstructions, losing little momentum, and
leaving only a small stagnant area behind the
obstruction.
Airflow with wide, blunt obstruction
A wide, blunt, or flat-faced obstruction forces
the air to change direction, turning upward and
outward. There is a stagnant area behind these
obstructions that is wider and higher than the
obstructions themselves.
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