What Is An Air Filtration System?

An air filtration system removes particulates such as dust, pollen, mold, bacteria, smoke, and other debris from the air. Air filtration is crucial for enhancing indoor air quality.

Air filtration systems can be found in various applications across different industries where specific indoor air quality requirements must be met.

How Does an air filtration system work?

The process of air filtration can be divided into 3 phases:

Interception

Interception takes place when airborne particles make contact with the filter fibers as they traverse through the filter. Subsequently, these particles are effectively captured by the filter fibers.

As air travels through the filter, airborne particles remain in a continuous state of motion. As these particles approach the filter fibers closely, they adhere to the fibers, ultimately being efficiently extracted from the airstream.

Impaction

Larger particles in the airstream fail to follow the contour of the airflow and then collide with the filter fibers directly. At this stage, impaction happens.

As air velocity increases, the rate of impaction also rises. With denser filter media, the probability of impaction also increases.

Diffusion

In air filtration, diffusion is a mechanism that captures ultrafine particles, often those with a diameter of less than 0.1 micrometers. These minuscule particles don’t typically travel linearly; they exhibit a random, zigzag trajectory influenced by Brownian motion.

Brownian motion refers to the unpredictable movement of tiny particles as they float within an airstream. This movement makes it more likely for the particles to touch and stick to filter fibers, removing them from the air.