Frequency [50Hz/60Hz]

            

Frequency affects the fans speed. The higher the frequency the faster the fan will spin. A faster spinning fan generates more airflow, static pressure, and noise. 

Static Pressure

            

When fans push out air, this creates positive static pressure. In an enclosed space, a fan operates in a tightly packed place which generates negative static pressure and reduce the fan’s airflow. A fan’s static pressure rating, measured by mm-H2O, reflects how well the unit will operate under negative static pressure.  

Power [W]

            

The amount of power, W or Watts, a fan consumes.

Rotations Per Minute [RPM]

            

RPM measures how fast the fan is spinning per minute. In theory, the higher the RPM the higher the airflow.