How air filters work

1. Air filtration technology mainly uses filtration separation methods: by installing filters with different performance to remove suspended dust particles and microorganisms from the air, that is, using filter media to capture and trap dust particles, ensuring the cleanliness of the incoming air volume. The filter media used is a fine-diameter fiber, which allows airflow to pass smoothly and effectively captures dust particles.

2. Clean technology controls the dust filtered by dust particles generally 0.1---10μm, with smaller particle sizes, including solid and liquid particles; organic particles suspended in the atmosphere include microorganisms, plant pollen, lint, and fluff. Microorganisms generally include viruses, rickettsia, bacteria, fungi, protozoa, and algae. Air purification mainly controls bacteria, fungi, and viruses. Because microorganisms mainly attach to dust particles, effectively controlling airborne dust particles also effectively controls airborne bacteria, fungi, and viruses. To achieve this, filtering must be done through barrier-type particulate filters. Generally, ordinary high-efficiency filters can filter bacteria with an efficiency of up to 99.996%, which basically meets the filtration and purification requirements of biological cleanrooms.

The filter layer of the filter layer mainly collects particles, which serves five purposes:

1. Interception effect: When a particle of a certain size moves near the fiber surface, the distance from its centerline to the fiber surface is less than the radius of the particle, causing dust particles to be intercepted and deposited by the filter media fibers.

2. Inertial effect: When the mass or velocity of particles is large, they collide with the fiber surface due to inertia and deposit deposits.

3. Diffusion effect: Small-sized particles have strong Brownian motion and are more likely to collide with the fiber surface.

4. Gravity effect: When particles pass through the fiber layer, they settle on the fibers due to gravity settlement.

5. Electrostatic effect: Fibers or particles may carry an electric charge, generating an electrostatic effect that attracts particles and attracts them onto the fiber surface.