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What is the relationship between fan speed, airflow, and static pressure?

Airflow is proportional to the fan speed, while static pressure is proportional to the square of the fan speed.

For example:
  • When the fan speed is doubled, the airflow doubles and the static pressure increases by a factor of four.
  • When the fan speed is reduced to half, the airflow is reduced to half and the static pressure decreases to one-fourth.
* Note: The values above are theoretical.
               Actual performance may vary depending on the operating environment.