In addition to a fan's size and speed, the airflow and static pressure specifications are two important metrics for evaluating a fan's performance.
Airflow is expressed as the volume of air moved, either in cubic meters per hour (m³/h) or alternatively in CFM (cubic feet per minute). Static pressure, on the other hand, is specified in mm H2O using the so-called (milli)meter water column and corresponds to the pressure at the specified water depth.
Airflow specifications therefore provide information about the maximum amount of air the fan can move, whereas static pressure figures provide information about the pressure at which the air is transported.
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