High Airflow Vs Static Pressure Fans

Af style fans have many thin blades 9 15 typically with a relatively steep angle.

High airflow vs static pressure fans.

The relationship between air flow and static pressure of a fan is shown in the graph above. Following on from my last article where i looked at whether push vs pull vs push pull makes a difference today we are looking at static pressure fans vs airflow fans. This is a highly efficient design to move airflow volume with the least amount of fan blade noise. And when static pressure increases air flow decreases.

As you can see air flow and static pressure have a negative correlation. For comparison 1 pound per square inch static pressure 1 psi is equal to 27 7 in. When it has no restrictions. High airflow fans simply push as much air as possible while static pressure fans are specifically designed to tackle installations with heightened impedance and resistance.

In addition fans are generally optimized to either move a high volume of air with large blades and high rpm or generate a high static pressure. The 3 points depict possible scenarios where the fan will perform. Using the fan in the wrong scenario will affect your cooling to a great extent. So what exactly is airflow and static pressure.

Water is equal to about 25 pascals pa. Sometimes static pressure is given as pascals pa. In case of static pressure and air flow fans there are a lot of difference. Airflow is the amount of air which is the fan is capable of removing at its greatest rpm.

The two opposite ends of the blade design spectrum are the af airflow and sp static pressure designed fans. High airflow fans can run into problems when.