Understanding Airflow Patterns - BIG ASS FANS powerfoil x2.0 Installation Manual

8'–24' POWERFOIL X2.0 WASHDOWN & POWERFOIL X2.0 PLUS WASHDOWN
® ®
10
Pre-Installation (cont.)

Understanding airflow patterns

Airflow in an open area
The airflow moves from the fan toward the floor.
Once 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. After it hits
the ceiling, the 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 of 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
Overhead View
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.
Side View
Airflow with wide, blunt obstruction
A wide, blunt, or flat-faced obstruction forces
airflow to change direction, turning it upward
and outward. There is a stagnant area behind
these obstructions that is wider and higher than
the obstructions themselves.
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